Article
Multidisciplinary Sciences
F. Manfouo, I. Nsangou, M. F. C. Fobasso, A. J. Fotue
Summary: The properties of an electron weakly coupled to piezo-acoustic phonon in asymmetrical Gaussian confinement potential quantum well (AGCPQW) subject to external electric field (EF) and magnetic field (MF) has been investigated. The effects of the EF, the MF, the range of the asymmetrical Gaussian confinement potential (RAGCP), Debye cut-off wavenumber (DCOW) and the electron-phonon coupling strength on the properties are analyzed.
Article
Engineering, Environmental
Jia Yuan, Huayu Bao, Hongli Liu, Shirong Wang, Xianggao Li
Summary: The alignment of energy levels between semiconductors and hole-transporting materials is crucial for the efficiency of perovskite solar cells. By controlling the surface termination state of perovskite crystals using a mixed solvent, the energy levels can be adjusted to better match the HTMs, leading to improved charge extraction and reduced recombination rates. This optimization results in increased open circuit voltage and conversion efficiency of the PSCs.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Physics, Multidisciplinary
Jie Gao, Yinuo Wang, Zhaoyang Song, Shumei Wang
Summary: This study combines the quantum DNA codec with quantum Hilbert scrambling to enhance the security and robustness of quantum images. The quantum DNA codec is used to encode and decode the pixel color information of the quantum image, while quantum Hilbert scrambling is employed to scramble the image position data. Experimental simulation and result analysis show that the proposed technique significantly strengthens the anti-attack of quantum images.
Article
Materials Science, Multidisciplinary
Duk-Hyun Choe, Damien West, Shengbai Zhang
Summary: Although real materials are finite in size, electronic structure theory is based on the assumption of infinitely large solids, which has led to a debate on the location of the vacuum level. A new analytic real-space potential-unfolding approach is introduced to uncover the vacuum level in infinitely large solids, revealing an unknown bulk quadrupole offset with respect to the vacuum level in the absence of a physical surface. This theory identifies intrinsic contributions of a bulk solid to its surface and interface properties, resolving ambiguities surrounding the band alignment between matters.
Article
Physics, Multidisciplinary
Yaman Evkaya, Ozguer Okcu, Ekrem Aydiner
Summary: In this paper, we investigate positive oscillator-shaped well potential and propose a Szilard-like quantum heat engine based on energy level degeneracy. We compute the extracted work and efficiency by utilizing the position-dependent energy eigenvalues of the oscillator-shaped well and analyze their dependence on angular frequency, well width, and temperature.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
S. Predin, A. Knezevic, M. Milovanovic
Summary: We propose a variant of dipole representation for composite fermions in a half-filled Landau level, incorporating the symmetry under particle-hole exchange. This is achieved by imposing a special constraint on the composite fermion and composite hole degrees of freedom in an enlarged space, ensuring that the resulting composite particle (dipole) is a symmetric object. We investigate an effective Hamiltonian that satisfies the constraint on the physical space and exhibits boost invariance at the Fermi level. The calculated Fermi liquid parameter F2 agrees well with the numerical investigations in Phys. Rev. Lett. 121, 147601 (2018).
Article
Physics, Applied
Jing-Hong Mei, Bin Zhang, Jing-Lin Xiao, Yong Sun, Wei Zhang, Xiu-Juan Miao, Sarengaowa, Xin-Jun Ma
Summary: This study investigates the properties of magnetopolarons in III-V compound semiconductors and discovers that the ground-state binding energy of magnetopolarons is affected by magnetic field, crystal type, and the type of potentials, leading to interesting phenomena. The findings of this study provide important theoretical guidance for optoelectronic devices and quantum information.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Nanoscience & Nanotechnology
Iva Rreza, Haoran Yang, Leslie Hamachi, Michael Campos, Trevor Hull, Joseph Treadway, Juanita Kurtin, Emory M. Chan, Jonathan S. Owen
Summary: The color conversion performance of amber and red emitting quantum dots on InGaN SSL LED packages was investigated in this study. Thick CdS shells were found to enhance photoluminescence quantum yields, but the growth of a ZnS shell on the quantum wells' surface improved long-term stability while reducing PLQY. Therefore, the outer ZnS shell layer plays a crucial role in optimizing the performance and stability of quantum dots during operation on SSL packages.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Environmental
Jianxin Zhang, Guizhi Zhang, Yongyu Liao, Zhenxiao Pan, Huashang Rao, Xinhua Zhong
Summary: In this study, a novel hybrid hole conductor, Poly-3-hexylthiophene - CsPbI3 quantum dots (P-QD), was used to improve hole extraction in CsPbI2Br C-PSCs. The P-QD hybrid hole conductor effectively improved hole extraction by aligning perovskite/carbon energy-level and extending the optical response range of CsPbI2Br solar cells, resulting in an increased power conversion efficiency from 13.49% to 15.04%. This strategy provides a new approach for the construction of hole transport layers in carbon-based perovskite solar cells.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Multidisciplinary
Nguyen Dinh Hien
Summary: The effect of electronic confinement potential on the electron-LO-phonon interaction energy in a quantum well was investigated using the variational method. The result shows that the el-LO-ph interaction energy in a quantum well is affected strongly by the electronic confinement potential for all four confined-optical-phonon models.
Article
Optics
Stephen C. Wein, Juan C. Loredo, Maria Maffei, Paul Hilaire, Abdelmounaim Harouri, Niccolo Somaschi, Aristide Lemaitre, Isabelle Sagnes, Loic Lanco, Olivier Krebs, Alexia Auffeves, Christoph Simon, Pascale Senellart, Carlos Anton-Solanas
Summary: This study demonstrates that the process of spontaneous emission of light from an atom can generate photon-number entangled states distributed in time, which can be achieved by exciting a quantum dot. The results also show that applying different lengths of pulse sequences can produce a series of multi-temporal mode entangled states that are intrinsically related to the Fibonacci sequence.
Article
Chemistry, Physical
Yinan Shu, Zoltan Varga, Dayou Zhang, Donald G. Truhlar
Summary: Constructing analytic representations of potential energy surfaces is difficult, especially when coupled potential energy surfaces and their nonadiabatic couplings are involved. In order to facilitate the use of developed potentials, we have created ChemPotPy, a user-friendly library for analytic representation of single-state and multistate potential energy surfaces and couplings.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Computer Science, Artificial Intelligence
Tulika Dutta, Sandip Dey, Siddhartha Bhattacharyya, Somnath Mukhopadhyay, Prasun Chakrabarti
Summary: A Qutrit Genetic Algorithm based method for hyperspectral image segmentation is proposed, utilizing quantum logic operators and ternary chromosomes to optimize accuracy and efficiency. Experimental results and comparisons with various optimization algorithms and supervised methods demonstrate the effectiveness and advantages of the proposed approach.
EXPERT SYSTEMS WITH APPLICATIONS
(2021)
Article
Physics, Multidisciplinary
Adiljan Sawut, Sayipjamal Dulat, B. S. Xie
Summary: The study investigates electron-positron pair production in an asymmetric Sauter potential well, comparing it with the symmetric case in terms of momentum spectrum, location distribution, and total pair numbers. By analyzing the relationship between energy levels and photon energy, the study confirms the validity of the approximation for the created electrons in the asymmetric potential well. The optimization of momentum spectrum in the asymmetric well over the symmetric well is attributed to the location distribution of electrons.
Article
Physics, Multidisciplinary
Chungho Cheng, Matteo Cirillo, Niels Gronbech-Jensen
Summary: Langevin simulations were conducted to study Josephson escape statistics over a wide range of parameter values. Comparisons with Kramers and BHL models show good agreement at high to moderate damping, with the BHL model performing well even at lower damping values. A new model is developed to explain discrepancies in escape statistics at extremely low damping, showing that bias sweep can effectively cool the system below thermodynamic values.
Article
Biochemistry & Molecular Biology
Ping Zhang, Xirui Tian, Shaoxiang Sheng, Chen Ma, Linjie Chen, Baojie Feng, Peng Cheng, Yiqi Zhang, Lan Chen, Jin Zhao, Kehui Wu
Summary: This study reports the Raman characterization of the alpha borophene polymorph using scanning tunneling microscopy combined with tip-enhanced Raman spectroscopy. A series of Raman peaks were discovered, which can be related to the phonon modes calculated based on an asymmetric buckled alpha structure. The unusual enhancement of high-frequency Raman peaks in TERS spectra of alpha borophene is found to be associated with its unique buckling when landed on the Ag(111) surface. This paper demonstrates the advantages of TERS in studying the local vibrational properties of materials at the nanoscale, including high spatial resolution and selective enhancement rule.
Article
Chemistry, Multidisciplinary
Yongliang Shi, Muztoba Rabbani, Alvaro Vazquez-Mayagoitia, Jin Zhao, Wissam A. Saidi
Summary: The study demonstrates that MoS2 grain boundaries can stabilize Pt nanoclusters, particularly up to a size of nearly ten atoms, indicating potential applications for enhanced stabilization in high-temperature scenarios.
Review
Physics, Atomic, Molecular & Chemical
Xiongzhi Zeng, Wei Hu, Xiao Zheng, Jin Zhao, Zhenyu Li, Jinlong Yang
Summary: Computational simulation plays a crucial role in accurately characterizing the structure and properties of nanosystems. Various methods, such as electronic structure calculations, scanning tunneling microscopy image simulation, hierarchical equation solving, and excited state dynamics simulation, have been developed to provide electronic structure information and experimentally comparable data. Additionally, multiscale simulation methods are essential for characterizing the atomic details of nanosystems involved in chemical processes.
CHINESE JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Ping Zhang, Linjie Chen, Shaoxiang Sheng, Wenqi Hu, Huiru Liu, Chen Ma, Zijia Liu, Baojie Feng, Peng Cheng, Yiqi Zhang, Lan Chen, Jin Zhao, Kehui Wu
Summary: This study investigated the adsorption and self-assembly structures of melamine molecules on an Ag(111) surface using low temperature scanning tunneling microscopy (STM) combined with tip-enhanced Raman spectroscopy (TERS). Two ordered self-assembly phases of melamine molecules on Ag(111) were observed, and it was found that the dehydrogenation of melamine can be controlled by annealing the sample or through a tip-enhanced photo-catalytic effect.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Yuli Lei, Zhenfa Zheng, Luis Vasquez, Jin Zhao, Jing Ma, Haibo Ma
Summary: This study investigates the electron transfer process across organic/inorganic interfaces using ab initio nonadiabatic molecular dynamics methods and spin dynamics. It shows that the electron transfer and relaxation processes can occur simultaneously and be controlled by spin-orbital couplings (SOCs). Additionally, a significant portion of the transferred electrons flip their spin within a short period of time due to strong SOCs in MoS2. This research provides important insights for designing novel devices and applications based on organic/inorganic heterojunctions, emphasizing the significance of spin dynamics simulations in understanding photoinduced processes in materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Applied
Yanan Dai, Zhikang Zhou, Atreyie Ghosh, Karan Kapoor, Maciej Dabrowski, Atsushi Kubo, Chen-Bin Huang, Hrvoje Petek
Summary: We report a study on transient plasmonic spin skyrmion topological quasiparticle using ultrafast interferometric time-resolved photoemission electron microscopy. By modeling and experimental measurements, we obtain the spin texture, boundary, and topological charges of the skyrmion, and discover its ability to drive magnetoelectric responses.
APPLIED PHYSICS REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
Qinwen Lu, Yun Cheng, Lijun Wu, Hongli Guo, Fengfeng Qi, Haijuan Zhang, Junxiao Yu, Qixin Liu, Qing Wang, Genhao Liang, Jie Chen, Yalin Lu, Jie Zhang, Dao Xiang, Jin Zhao, Yimei Zhu, Xiaofang Zhai
Summary: Ultrashort laser pulses have been used to drive phase transitions in complex quantum materials. By tracking atomic motions and conducting first-principles calculations, researchers have discovered significant differences between the light excited state and thermal equilibrium state, shedding light on the understanding of phase transitions in complex oxides.
NPJ QUANTUM MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Atreyie Ghosh, Sena Yang, Yanan Dai, Hrvoje Petek
Summary: The article discusses how to impose spin and field textures on matter through light-matter interactions on the nanoscale and femtosecond timescale in order to define the spatial and temporal symmetries of quasiparticle interactions. It specifically focuses on the topological spin structures of plasmonic lattices formed by surface plasmon polariton fields, from triangular to circular geometries. The goal is to introduce the topological properties of plasmonic vortices and expand our understanding of how their spin and field textures affect material properties for applications in photonics and spintronics.
Article
Multidisciplinary Sciences
Aolei Wang, Xiang Jiang, Qijing Zheng, Hrvoje Petek, Jin Zhao
Summary: This study investigates the transition from bright to momentum-forbidden dark excitons in anatase TiO2, revealing that the many-body electron-hole Coulomb interaction activates additional exciton relaxation channels to notably accelerate the exciton transition. The existence of dark excitons and ultrafast bright-dark exciton transitions provides insights into the applications of anatase TiO2 in optoelectronic devices and light-energy harvesting, as well as the formation process of dark excitons in semiconductors.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Computer Science, Interdisciplinary Applications
Shanshan Wang, Menglin Huang, Yu-Ning Wu, Weibin Chu, Jin Zhao, Aron Walsh, Xin-Gao Gong, Su-Huai Wei, Shiyou Chen
Summary: This study redefines carrier lifetime and presents a systematic method for calculating effective carrier lifetime in semiconductor crystals. By considering all recombination mechanisms and appropriate carrier and defect densities, the gap between modeling and measurements can be bridged.
NATURE COMPUTATIONAL SCIENCE
(2022)
Article
Multidisciplinary Sciences
Chuanyu Zhao, Qijing Zheng, Jin Zhao
Summary: This study investigates the non-equilibrium spin and electron dynamics in a prototypical topological insulator Bi2Se3 using ab initio non-adiabatic molecular dynamics simulation. The results show that spin canting and backscattering occur in an oscillating manner between time-reversal pair topological surface states (TSSs) in the non-equilibrium dynamics. These phenomena lead to ultrafast spin relaxation with a timescale around 100 fs, providing critical insights for the design of ultrafast spintronic materials.
FUNDAMENTAL RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Branko Gumhalter, Dino Novko, Hrvoje Petek
Summary: This study explores the possibility of plasmonically generated electronic Floquet bands on metal surfaces and estimates the resonant behavior and emission yield of Ag(111) surface. The relative yield intensities from non-Einsteinian emission channels in photoelectron spectra provide a means to calibrate the mediating plasmonic fields and surface Floquet bands.
Article
Chemistry, Multidisciplinary
Chao Zhang, Linjie Chen, Jin Zhao, Hrvoje Petek
Summary: In this study, we characterized the N-2 adsorption and co-adsorption on the K/Ag(111) surface using scanning tunneling microscopy and density functional theory. Our findings reveal the fundamental interactions between alkali promoters and N-2 feedstock, which are of significance in heterogeneous catalysis.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Zhenfa Zheng, Qijing Zheng, Jin Zhao
Summary: In this study, the ultrafast demagnetization induced by SOC in Ni at 300K was investigated using time-domain ab initio nonadiabatic molecular dynamics. Different relaxation pathways for spin-minority and spin-majority electrons after photoexcitation were found, leading to demagnetization in Ni.