Article
Chemistry, Multidisciplinary
Spyridon G. Kosionis, Alexandros Kontakos, Emmanuel Paspalakis
Summary: In this study, we investigated the optical absorption in a hybrid structure consisting of a metal nanoshell and a semiconductor quantum dot interacting with a linearly polarized probe electromagnetic field. By deriving the equations of motion and analytical expressions for the linear susceptibility, we found that by engineering the thickness of the metal nanoshell, the material of the dielectric core, and the interparticle distance, an optimum response can be achieved. Two distinct types of hybrid exciton states were identified, showing different spectral characteristics and exciton lifetimes depending on the strength of the exciton-plasmon coupling.
APPLIED SCIENCES-BASEL
(2023)
Article
Nanoscience & Nanotechnology
Hamid Reza Hamedi, Vassilios Yannopapas, Algirdas Mekys, Emmanuel Paspalakis
Summary: The nonlinear optical response of a four-level double-V-type quantum system interacting with a two-dimensional array of metal-coated dielectric nanospheres was investigated. It was found that the Kerr nonlinearity of the system can be controlled and enhanced by varying the distance of the quantum system from the plasmonic nanostructure, and adjusting the relative phase of the applied fields can change the polarization rate of one of the laser fields.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Yuanqing Xu, Weibiao Wang, Zhexue Chen, Xinyu Sui, Aocheng Wang, Cheng Liang, Jinquan Chang, Yanhong Ma, Luting Song, Wenyu Jiang, Jin Zhou, Xinfeng Liu, Yong Zhang
Summary: A general strategy has been developed to mechanically tailor semiconductor bulk materials into quantum dots, resulting in high yields of various semiconductor QDs. The produced QDs exhibit outstanding water solubility and remarkable photoluminescence, showing potential for practical applications in solid-state fluorescence and nonlinear saturation absorption.
Article
Physics, Applied
Ali Cahit Kosger, Amir Ghobadi, Zahra Rahimian Omam, Mahmut Can Soydan, Turkan Gamze Ulusoy Ghobadi, Ekmel Ozbay
Summary: In this paper, a large-scale compatible plasmonic nanocavity design platform is used to achieve a nearly tenfold increase in photoluminescence (PL) enhancement. The design consists of multi-sized/multi-spacing gold (Au) nanounits wrapped in a thin aluminum oxide (Al2O3) layer to form a metal-insulator-semiconductor cavity, with semiconductor quantum dots (QDs) coated on top. Numerical and experimental data show that, with an optimal insulator layer thickness, the simultaneous formation of broadband Fabry-Perot resonances and plasmonic hot spots enhances light absorption within the QD unit, leading to the PL enhancement of QDs. This work demonstrates the potential and effectiveness of a random plasmonic nanocavities host in achieving lithography-free efficient emitters.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Review
Chemistry, Multidisciplinary
Mohamad Insan Nugraha, Indriyati Indriyati, Indah Primadona, Murali Gedda, Gerald Ensang Timuda, Ferry Iskandar, Thomas D. Anthopoulos
Summary: This article reviews recent progress in the use of semiconducting colloidal quantum dots (CQDs) in emerging thin-film thermoelectrics. It outlines the fundamental concepts of thermoelectricity in nanostructured materials, provides an overview of popular synthetic methods for producing CQDs, and discusses their application in thin-film thermoelectric generators (TEGs). The current challenges and future perspectives for enhancing the performance of CQD-based thermoelectric materials are also discussed.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Mohamad Insan Nugraha, Indriyati Indriyati, Indah Primadona, Murali Gedda, Gerald Ensang Timuda, Ferry Iskandar, Thomas D. D. Anthopoulos
Summary: Semiconducting colloidal quantum dots (CQDs) are a promising class of thermoelectric materials for future applications. They offer solution processability and scalable manufacturing potential. With their unique low dimensionality, CQDs can be utilized to tune the Seebeck coefficient and thermal conductivity independently, making them suitable for use in thin-film thermoelectric generators (TEGs) operating near room temperature.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Athanasios Smponias, Dionisis Stefanatos, Emmanuel Paspalakis
Summary: In this study, a hybrid nanostructure composed of a semiconductor quantum dot coupled to a metallic nanoparticle was investigated for the efficient creation of biexciton state using linearly polarized laser pulses. Numerical simulations showed that a simple on-off-on pulse-sequence can efficiently prepare the biexciton state even in the presence of the nanoparticle, for various interparticle distances and biexciton energy shifts. The pulse durations in the sequence were determined by solving a transcendental equation.
Article
Quantum Science & Technology
Si-Si Gu, Bao-Chuan Wang, Ming-Bo Chen, Ting Lin, Yuan Kang, Hai-Ou Li, Gang Cao, Guo-Ping Guo
Summary: The integration of quantum dots with a microwave resonator in the hybrid circuit quantum electrodynamics architecture has created a controllable artificial system and enriched physics through electron-photon interaction. The study investigates a hybrid device where a triple quantum dot is dipole coupled with the electric field of a superconducting quantum interference device array resonator. The results suggest that the hybrid system has the potential to investigate exotic many-body effects and matter-light interaction, depending on the relationship between various Coulomb energy in the quantum dot and the cavity photon energy.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Quantum Science & Technology
Manish Kumar Mehta, Joseph Thomas Andrews, Pratima Sen
Summary: In this paper, a novel method is proposed to overcome the limitations of exciton and biexciton states only appearing at low temperatures, as well as the complexity of using lasers with different polarization states for CNOT operations. By utilizing ultrafast magnetic pulse CNOT gate operation in Mn-doped InSb quantum dots at room temperature, with only a circularly polarized laser pulse, the proposed method shows a significantly large fidelity calculation for CNOT gate.
QUANTUM INFORMATION PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
A. Ed-Dahmouny, N. Zeiri, R. Arraoui, N. Es-Sbai, M. Jaouane, A. Fakkahi, A. Sali, K. El-Bakkari, C. A. Duque
Summary: The finite-element method (FEM) and the effective-mass approximation (EMA) were used to study the third harmonic generation (THG) in the core-shell nanodot of a GaAs core surrounded by an AlGaAs shell, embedded with different dielectric surrounding matrices (DSMs). The results showed that the real and imaginary parts, as well as the modulus of THG, can be enhanced and experience a shift in the presence of an adequate DSM. Additionally, varying the degree of ellipticity of the nanodot and the presence of donor impurities can also affect the THG.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Physics, Multidisciplinary
Ting Lin, Hai-Ou Li, Gang Cao, Guo-Ping Guo
Summary: In this work, we propose a mechanism for coupling a plane structure of four quantum dots with a resonator. We investigate the dependence of the quadruple coupling strength and qubit decoherence rate, and identify the optimal operating position for the hybrid system. Using the input-output theory, we predict the signatures in the resonator spectrum. Additionally, based on previous research, we demonstrate that the device described in this paper can achieve the strong coupling limit, allowing for system extension under existing technical conditions.
Article
Chemistry, Multidisciplinary
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: The study investigates the modified nonlinear pump-probe optical properties due to the excitonic-plasmonic interaction of a double semiconductor quantum dot molecule coupled to a metal nanoparticle. The absorption and dispersion spectra of an electromagnetic field in a hybrid structure are examined, with a focus on how the distance between the two elements affects the optical response. The calculations consider various physical constants of the system, including pump-field detuning and energy separation gap associated with excited states.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Jijie Huang, Xin Li Phuah, Luke Mitchell McClintock, Prashant Padmanabhan, K. S. N. Vikrant, Han Wang, Di Zhang, Haohan Wang, Ping Lu, Xingyao Gao, Xing Sun, Xiaoshan Xu, R. Edwin Garcia, Hou-Tong Chen, Xinghang Zhang, Haiyan Wang
Summary: The study designs a structure that embeds alloy nanopillars into a BTO matrix, forming vertically aligned nanocomposites with excellent epitaxial quality and interesting properties like high magnetic anisotropy and magneto-optical coupling response.
Article
Nanoscience & Nanotechnology
Heidi Potts, Markus Aspegren, Rousan Debbarma, Sebastian Lehmann, Claes Thelander
Summary: We investigate tunnel transport spectroscopy on a quantum dot molecule with a superconducting contact. The scattering between quantum dot spins and Bogoliubov quasiparticles leads to the formation of Yu-Shiba-Rusinov states within the superconducting gap. We find that the interaction between inter-dot spin-triplet state and the superconductor is stronger than the corresponding singlet, indicating stronger screening.
Article
Chemistry, Multidisciplinary
Minho Choi, Mireu Lee, Sung-Yul L. Park, Byung Su Kim, Seongmoon Jun, Suk In Park, Jin Dong Song, Young-Ho Ko, Yong-Hoon Cho
Summary: In this study, a method is proposed to deterministically integrate single quantum dots with tailor-made photonic structures. A nondestructive luminescence picking method called nanoscale-focus pinspot (NFP) is used to reduce the luminous quantum dot density. The selected quantum dot is then deterministically integrated with a tailor-made photonic structure, leading to improved extraction efficiency.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Analytical
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we investigated the optical properties of a hybrid structure consisting of a semiconductor quantum dot and a doubly clamped suspended graphene nanoribbon nanoresonator. We obtained analytical results for the linear and third-order optical susceptibilities of the hybrid system. The linear susceptibility exhibited a single resonance whose position depended on the on-resonance exciton energy and the exciton-nanoribbon resonator coupling strength coefficient. The third-order optical susceptibility exhibited a sharp resonance at low frequencies determined by the fundamental flexural phonon mode, and a broader resonance at higher frequencies determined by the coupling strength coefficient and exciton frequency, with the amplitude solely dependent on the exciton-photon coupling strength.
Article
Physics, Applied
Nikos Iliopoulos, Ioannis Thanopulos, Vasilios Karanikolas, Emmanuel Paspalakis
Summary: We investigate the entanglement dynamics between two qubits and a graphene nanodisk using the macroscopic quantum electrodynamics method. Our findings show that as the free-space decay rate increases, the decaying Rabi oscillations in the qubit population dynamics change to complex non-Markovian dynamical population evolution. This is also reflected in the concurrence, which can reach values up to 0.5 under weak or moderate light-matter coupling conditions and transiently higher values under stronger coupling conditions. These results demonstrate the potential of graphene nanostructures for realizing high degrees of entanglement at the nanoscale, which is crucial for quantum technology applications.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Ioannis Thanopulos, Vassilios Yannopapas, Emmanuel Paspalakis
Summary: This study investigates the characteristics of spontaneous emission near a topological insulator Bi2Se3 nanosphere. The numerically calculated Purcell factor shows that the topologically protected delocalized states on the nanosphere surface significantly enhance the light-matter interaction in the terahertz regime. The simulations demonstrate intense reversible dynamics and population trapping effects.
Article
Chemistry, Multidisciplinary
Spyridon G. Kosionis, Alexandros Kontakos, Emmanuel Paspalakis
Summary: In this study, we investigated the optical absorption in a hybrid structure consisting of a metal nanoshell and a semiconductor quantum dot interacting with a linearly polarized probe electromagnetic field. By deriving the equations of motion and analytical expressions for the linear susceptibility, we found that by engineering the thickness of the metal nanoshell, the material of the dielectric core, and the interparticle distance, an optimum response can be achieved. Two distinct types of hybrid exciton states were identified, showing different spectral characteristics and exciton lifetimes depending on the strength of the exciton-plasmon coupling.
APPLIED SCIENCES-BASEL
(2023)
Article
Optics
Margarita-Georgia Papadaki, Nikolaos Kyvelos, Emmanuel Paspalakis, Vassilios Yannopapas
Summary: In this article, the theoretical effect of bismuth chalcogenide microparticles on the spontaneous emission of a double-V-type quantum emitter in free space is examined. It is found that the presence of a single microparticle results in a high degree of quantum interference, leading to significant changes in the emitted energy spectrum. The initial state of the quantum emitter plays a crucial role in the energy release in the presence of the microparticle. This observation has potential implications for quantum computing, especially in the reading of atomic qubit states. The effect is more pronounced when two microparticles are present, particularly when the quantum emitter is located in the gap between the particles.
Article
Materials Science, Multidisciplinary
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: We study the pump-probe optical response and the third-order self-Kerr nonlinearity of a localized exciton coupled to a suspended monolayer Z-shaped graphene nanoribbon nanoresonator. The quantum Langevin equations governing the dynamics of the electron population are derived. Analytical expressions for the linear optical susceptibility and four-wave mixing coefficient are obtained, while the third-order optical susceptibility is calculated numerically. The findings demonstrate the impact of the pump field Rabi frequency on the spectral characteristics and suggest potential applications in nonlinear nanophotonic devices.
Article
Physics, Applied
Dionisis Stefanatos, Foteini Avouri, Emmanuel Paspalakis
Summary: This article investigates the use of spatially modulated control fields to increase the efficiency of four-wave mixing in a four-subband semiconductor asymmetric double quantum well. The results show that by using a control field with a constant amplitude and linearly varying mixing angles, near-unity conversion efficiency can be achieved even for short propagation distances.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Hamid R. Hamedi, Julius Ruseckas, Vassilios Yannopapas, Dimitrios Karaoulanis, Emmanuel Paspalakis
Summary: In this work, we investigate the interaction between a pair of counterpropagating spatially inhomogeneous weak vortex beams and a quantum emitter with a double-V level scheme and closely situated upper levels. We demonstrate that the emitter experiences a quantized torque, which depends on the topological charge of the vortices and is strongly influenced by the quantum interference of spontaneous emission. Depending on the initial states of the emitter, different optical phenomena such as absorption, optical transparency, or lasing without inversion can be achieved. Moreover, we show that the interference in spontaneous emission can be modified by placing the double-V emitter above a thick slab of Bi2Te3 and propagating the vortex beams parallel to the surface. The induced torque results in the rotation of the emitters and the generation of a persistent toroidal current flow above the surface, whose intensity can be controlled remotely by varying the distance from the surface.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we theoretically investigate the pump-probe response and the four-wave mixing spectrum in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle. Using a density matrix methodology, we calculate the absorption/gain, dispersion, and four-wave mixing spectra, and analyze their spectral characteristics. We also apply the metastate theory and the dressed-state picture to predict the positions of the spectral resonances.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Chemistry, Multidisciplinary
Ioannis Thanopulos, Vassilios Yannopapas, Emmanuel Paspalakis
Summary: In this study, the spontaneous emission dynamics of a quantum emitter near a topological insulator Bi2Se3 spherical nanoparticle are investigated. High Purcell factors up to 1010 at large distances in the terahertz regime are observed using the electromagnetic Green's tensor method. The research shows non-Markovian spontaneous emission dynamics and potential dynamical quantum speedup for short vacuum decay times, while the dynamics become progressively Markovian and the quantum speedup vanishes as the vacuum decay times increase. Additionally, a hybrid bound state between the quantum emitter and the continuum of electromagnetic modes affected by the nanoparticle is observed.
Article
Optics
Vassilios Yannopapas, Emmanuel Paspalakis
Summary: We theoretically investigate the emergence of an anisotropic Purcell factor in two-dimensional fractal aggregates of metallic or dielectric nanoparticles. Using the electromagnetic Green's tensor and the coupled-dipole method, we calculate the spontaneous emission rates of a quantum emitter. Our results show that the Purcell factor exhibits spatial variations, with high values in certain regions for dipoles oriented within the plane of the fractal aggregate, while dipoles oriented vertically have values close to unity. This anisotropy in the Purcell factor leads to significant quantum interference effects and the occurrence of population trapping in multi-level quantum emitters embedded within fractal aggregates of nanoparticles.
Article
Optics
Vasileios Evangelakos, Emmanuel Paspalakis, Dionisis Stefanatos
Summary: We derive shortcuts to adiabaticity for STIRAP and maximize population transfer in a three-level quantum system. We formulate the optimal control problem on a classical driven dissipative harmonic oscillator and obtain analytical expressions for the optimal pulse sequence. We also compare different control methods and discuss their efficiencies for population transfer.
Article
Physics, Condensed Matter
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: We investigate the optical susceptibilities of a semiconductor quantum dot with an exciton-biexciton configuration driven by a resonant pump field and interacting with a weak field. The linear polarized applied fields simplify the energy level diagram. By using a dipole approximation and a rotating frame, we derive the equations of motion and calculate the density matrix components related to the linear and nonlinear susceptibilities. We analyze the spectral properties of the first-order susceptibility and the self-Kerr susceptibility, considering the Rabi frequency and the detuning of the pump field, as well as the biexciton energy shift.
MICRO AND NANOSTRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Spyridon G. Kosionis, Vassilios Yannopapas, Emmanuel Paspalakis
Summary: We analyze the two-time intensity correlation function of a fluorescent field emitted by a three-level V-type quantum emitter near a two-dimensional periodic plasmonic nanostructure. The decay rates for a quantum emitter with different dipole orientations and the distance between the quantum emitter and the nanoparticle array lead to simulation of quantum interference effects. We demonstrate a strong modification of the two-time intensity correlation functions by studying specific physical parameters of the hybrid structure.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we theoretically investigate the pump-probe response and the four-wave mixing spectrum in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle. Using a density matrix methodology, we calculate the absorption/gain, dispersion, and four-wave mixing spectra, and analyze their spectral characteristics. We also apply the metastate theory and the dressed-state picture to predict the positions of the spectral resonances.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
L. S. Lima
Summary: This study investigates quantum correlation and entanglement in the non-Hermitian Hubbard model. By analyzing quantum entanglement measures such as entanglement negativity and entropy, the effect of non-Hermitian imaginary hopping on the system is explored. It is found that in the large... limit, the non-Hermiticity reverses the behavior of the ground state energy and low-lying excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Nam-Chol Ri, Chung-Sim Kim, Sang-Ryol Ri, Su-Il Ri
Summary: By decreasing the lattice thermal conductivity of GNR through chemical derivation and strain, enhancing the thermoelectric properties of the electron part can be an important method to approach PGEC. This paper proposes synthesized hybrid systems formed by chemical derivation in the middle parts of b-AGNRs, and investigates the band structures and thermoelectric properties of the electron part under different strains. The results show that the band gaps of the systems significantly increase under different strains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Le T. T. Phuong, Tran Cong Phong
Summary: This study investigates the effects of gas molecules adsorbed on /312-borophene on its electronic heat capacity and thermal Schottky anomaly. The results show that the adsorbed gas molecules have different impacts on the electronic heat capacity, leading to the generation of various new energy levels.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Tianyan Jiang, Jie Fang, Wentao Zhang, Maoqiang Bi, Xi Chen, Junsheng Chen
Summary: This paper investigates the adsorption and sensing properties of transition metal-doped WSSe gas-sensitive devices towards H2, CO, and CO2 gases related to thermal runaway in Li-ion batteries using density functional theory. The results show that Ti, Mn, and Mo dopants preferentially bind to the S-surface of the WSSe monolayer, and all three monolayers exhibit significantly improved sensing characteristics, with chemisorption towards CO. Band structure analysis suggests that the Ti-WSSe monolayer has the potential to be used as a resistive CO detection sensor. Recovery time calculations indicate the reuse capabilities of the gas-sensitive devices. Mn-WSSe monolayer shows potential for H2 detection, while Mo-WSSe monolayer is more suitable for CO2 detection. This work lays the foundation for potential gas-sensitive applications of WSSe monolayer in thermal runaway scenarios, advancing research in gas sensing domains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Olga A. Alekseeva, Aleksandr A. Naberezhnov, Ekaterina Yu. Koroleva, Aleksandr Fokin
Summary: This study investigates the temperature dependence of crystal structure and dielectric response in a nanocomposite material containing porous glasses and embedded sodium nitrate. The results reveal a crossover point in the temperature dependence of the order parameter of the structural transition in sodium nitrate nanoparticles, as well as a decrease in activation energy of sodium ions hopping conductivity during heating.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Lijun Cheng, Fang Cheng
Summary: This paper investigates the effects of electric and magnetic fields on the Goos-Hanchen (GH) shift in a semi-Dirac system. The results show that the magnitude and direction of the GH shift depend on various factors such as incidence angle, electric barrier height and width, and magnetic field. It is observed that there is a saltus step in GH shifts at the critical magnetic field, which decreases with increased potential barrier thickness. Additionally, the GH shift can be significantly enhanced by applying an electric field in the III region. These findings are important for the development of semi-Dirac based electronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Alexander K. Fedotov, Uladzislaw E. Gumiennik, Julia A. Fedotova, Janusz Przewoznik, Czeslaw Kapusta
Summary: The study conducted an improved analysis of carrier transport in single-layer graphene and hybrid structures, showing the coexistence of negative and positive contributions in magnetoresistive effect. Various models were used to analyze the dependences on temperature and magnetic field, providing insights into the behavior of electrical resistance in the structures.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xuhui Peng, Tao Chen, Ruotong Chen, Shizheng Chen, Qing Zhao, Xiaoping Huang
Summary: In this study, a novel method was proposed to design and fabricate optoelectronic devices with highly precise controlled photorefractive liquid crystal structures. By utilizing quantum dots and electric tuning, a regular periodic grating was formed in a quantum dot-doped liquid crystal volume illuminated by a laser standing evanescent wave field. The obtained optical diffraction pattern showed equally spaced light spots and high diffraction efficiency, indicating a significant change in the refractive index of the nanostructured device.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Kai-Hua Yang, Xiao-Hui Liang, Huai-Yu Wang, Yi-Fan Wu, Qian-Qian Yang
Summary: In this work, a theoretical model is proposed to achieve the controllability of quantum interference and decoherence. The effects of intralead Coulomb interaction, interdot tunneling, and electron-phonon interactions on differential conductance are investigated. The results show the appearance of destructive interference, Fano interference, and negative differential conductance in strong dot-lead tunneling regions, while a characteristic pattern of positive and negative differential conductances appears in the weak dot-lead tunneling regime.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xueying Wang, Qian Ma, Qi Zhang, Yi Wang, Lingyu Li, Dongheng Zhao, Zhiqiang Liu
Summary: Porous double-channel alpha-Fe2O3/SnO2 heterostructures with tunable surface/interface transport mechanism were successfully fabricated by electrospinning and calcination. These heterostructures exhibited a large specific surface area, providing more active sites and enhanced adsorption capacity. The optimal composite materials showed the highest response value and the fastest response/recovery times to DMF, along with good cycling performance, long-term stability, and high gas selectivity.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Donglin Guo, Zhengmeng Xu, Chunhong Li, Kejian Li, Bin Shao, Xianfu Luo, Jianchun Sun, Yilong Ma
Summary: Using full electron-phonon interactions and the Boltzmann transport equation, this study investigates the phonon scattering channel and electrical properties of graphene under anharmonic phonon renormalization (APRN). The results show that the APRN reduces the phonon frequency and three-phonon phase space with increasing temperature, affecting the acoustic branch more than the optical branch. The thermal conductivity of graphene decreases after considering three- and four-phonon scattering, and the primary scattering channels are identified. Furthermore, the APRN increases the strength of electron-phonon coupling and leads to an increase in n-type electric resistance at room temperature.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Hongping Zhao, Man Zhao, Dayong Jiang
Summary: The study proposes a broadband photodetector with high response, high sensitivity, and controllable band by integrating quantum dots and highly conductive materials. The PD composed of ZnO film/PbS quantum dots heterostructure shows excellent photoresponse performance in the UV-Vis-NIR range, with the peak responsivity increased by 550%, accompanied by significant red shift, faster response, and recovery speed. By using RF magnetron sputtering to prepare ultra-thin ZnO film, the impact of PbS quantum dots on the photoelectric properties of ZnO film is comprehensively and systematically discussed.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Ye Xuan Meng, Liwei Jiang, Yisong Zheng
Summary: Manipulating magnetism by electrical means is an effective method for realizing ultra-low power spintronic-integrated circuits. In this study, it is demonstrated that the two-dimensional semiconductor material InO monolayer can be tuned to a half-metallic state by applying a gate voltage, providing theoretical guidance for adjusting two-dimensional magnetic semiconductors.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Anusha Kachu, Aalu Boda
Summary: In this research, we investigated the impact of confinement nature on a neutral hydrogenic donor impurity in a quantum dot. The study demonstrated intriguing behavior in response to changes in potential shape, quantum dot parameters, and spin-orbit coupling strengths. The findings provide valuable insights into the fundamental physics of quantum dots and impurities and can aid in the design and optimization of QD-based technologies.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
