Article
Chemistry, Physical
Xiao-Yi Liu, Yu Cui, Jia-Pei Deng, Yi-Yan Liu, Xu-Fei Ma, Yu-Xuan Hou, Jun-Ye Wei, Zhi-Qing Li, Zi-Wu Wang
Summary: In this study, a method of a full-configuration defect based on the well-known Huang-Rhys model is developed to study the multiphonon processes of charge carrier trapping by various defects in metal halide perovskites quantum dots (MHPQDs). The trapping time dependence on the radius of quantum dot, defect depth, and temperature is investigated. These findings not only enhance our understanding of charge carrier trapping processes by defects, but also provide insights for the designs of MHPQDs-based photovoltaic and photoelectric devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Yu Cui, Xiao-Yi Liu, Shi-Yuan Ji, Yong Sun, Jia-Pei Deng, Xu-Fei Ma, Zhi-Qing Li, Zi-Wu Wang
Summary: This study theoretically investigates the nonradiative multiphonon processes among different types of quantum defects in metal halide perovskites. The findings provide insights into the mechanisms of charge transfer, blinking of photoluminescence spectra, and temperature dependence of these processes. The results contribute to a better understanding of defect-assisted nonradiative processes in perovskite materials and offer potential for higher-performance perovskite-based devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Chen Qiu, Yu Song, Hui-Xiong Deng, Su-Huai Wei
Summary: The conventional single-defect-mediated model fails to explain the observed nonradiative recombination phenomena in wide-band gap semiconductors. Due to the localized nature of defect states in these materials, a dual-level nonradiative recombination model is proposed. Through this model, the electron and hole trap levels can be closer to the conduction band and valence band, respectively, leading to enhanced nonradiative recombination.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Fatme Trad, Alaa E. Giba, Xavier Devaux, Mathieu Stoffel, Denis Zhigunov, Alexandre Bouche, Sebastien Geiskopf, Remi Demoulin, Philippe Pareige, Etienne Talbot, Michel Vergnat, Herve Rinnert
Summary: This study investigates the influence of phosphorous atoms on the phase separation and optical properties of silicon nanocrystals. It is found that phosphorus incorporation modifies the growth mechanism of Si-NCs, promoting phase separation and leading to nanocrystal formation at lower annealing temperatures. The presence of phosphorus also affects the size and emission wavelength of Si-NCs, and low phosphorus content can significantly improve photoluminescence intensity.
Article
Chemistry, Physical
Saleem Al-Maskari, Abey Issac, Srinivasa Rao Varanasi, Richard Hildner, R. G. Sumesh Sofin, A. Ramadan Ibrahim, Osama K. K. Abou-Zied
Summary: The role of quantum confinement and photoluminescence lifetime in semiconductor core/shell quantum dots is investigated through surface modification and photoluminescence quenching. The study reveals that quenching is more pronounced in CIS-dye assemblies compared to InP-dye assemblies, and dynamic quenching is dominant in all QD-dye assemblies. Furthermore, the cationic dye shows a stronger interaction with the QD shell surface than the zwitterionic dye.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Deniz Yazicioglu, Sebastian Gutsch, Margit Zacharias
Summary: The effect of an externally applied electric field on exciton splitting and carrier transport in Si nanocrystals embedded in SiO2 superlattices was investigated. The role of surface defects in enhancing this effect was analyzed. The findings provide insights for the design and application of photon detection and tandem solar cells.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Alfredo Morales-Sanchez, Karla Esther Gonzalez-Flores, Sergio Alfonso Perez-Garcia, Sergio Gonzalez-Torres, Blas Garrido-Fernandez, Luis Hernandez-Martinez, Mario Moreno-Moreno
Summary: In this research, the resistive-switching (RS) characteristics in a memristor based on silicon nanocrystals (Si-NCs) integrated into a complementary metal-oxide-semiconductor (MOS) structure were investigated. Si-NCs with a diameter of 5.48 +/- 1.24 nm embedded in a SiO2/Si-NCs/SiO2 multilayer structure acted as an RS layer. The devices exhibited bipolar RS with an intermediate resistance step during SET and RESET processes, and showed an ON/OFF ratio of similar to 10^6 and a retention time larger than 10^4 s.
Article
Chemistry, Physical
Dongke Li, Jiaming Chen, Zhaoguo Xue, Teng Sun, Junnan Han, Wanghua Chen, Etienne Talbot, Remi Demoulin, Wei Li, Jun Xu, Kunji Chen
Summary: Understanding the distribution and behavior of dopants in silicon nanocrystals is crucial for achieving controllable doping at the nanoscale and developing next-generation optoelectronic devices. This study investigates the atomic-scale distributions of phosphorus and boron dopants in silicon nanocrystal multilayers. The results show that phosphorus dopants mainly concentrate on the surfaces of silicon nanocrystals to passivate dangling bonds and provide free electrons, while boron dopants exhibit a different distribution pattern, forming a dopant-shell covering on the surfaces of silicon nanocrystals and leading to damage in the crystalline lattice.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Narender Kumar, Vijo Poulose, Youssef Taiser Laz, Falguni Chandra, Salma Abubakar, Abdalla S. Abdelhamid, Ahmed Alzamly, Na'il Saleh
Summary: This study investigates the effects of temperature on the photoluminescence from ZnO-SiO2 nanocomposite and successfully prepares SiO2-coated ZnO nanocrystals. The results reveal two emission bands and identify the sources of these emissions. The presence of SiO2 increases the exciton lifetime values and the occurrence of thermally induced nonradiative recombination transfer.
Article
Nanoscience & Nanotechnology
Alix Valdenaire, Alaa Eldin Giba, Mathieu Stoffel, Xavier Devaux, Loic Foussat, Jean -Marie Poumirol, Caroline Bonafos, Sonia Guehairia, Remi Demoulin, Etienne Talbot, Michel Vergnat, Herve Rinnert
Summary: In this work, the plasmonic properties of highly doped Si nanocrystals embedded in a silica matrix were investigated. P atoms were mainly located in the core of Si nanocrystals with concentrations reaching up to 10 atom %. Alloying and formation of SiP nanoparticles were observed for P contents exceeding 4 atom % in the multilayer. The infrared absorption measurements showed a localized surface plasmon resonance located in the 3-6 μm range. The simulation results revealed a dopant activation rate of about 8% with a mobility of 27 cm2 V-1 s-1 and a free charge carrier density of 2.3 x 1020 cm-3.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ida Tyschenko, Ruonan Zhang, Vladimir Volodin, Vladimir Popov
Summary: The formation of InSb nanocrystals at the bonding Si/SiO2 interface is a result of In and Sb atom diffusion from the ion-implanted SiO2 and Si regions. Annealing at higher temperatures causes the disappearance of transverse optical phonon mode and dominance of longitudinal optical phonon mode in the spectrum.
Article
Chemistry, Multidisciplinary
Dmitry S. Korolev, Kristina S. Matyunina, Alena A. Nikolskaya, Ruslan N. Kriukov, Alexey Nezhdanov, Alexey Belov, Alexey N. Mikhaylov, Artem A. Sushkov, Dmitry A. Pavlov, Pavel A. Yunin, Mikhail N. Drozdov, David Tetelbaum
Summary: This study proposes a new method for creating nanomaterials based on gallium oxide and investigates the influence of ion irradiation order on the chemical composition of implanted layers. The results show the separation of gallium profiles and the appearance of blue photoluminescence associated with Ga2O3 nanocrystals. Transmission electron microscopy confirms the formation of beta-Ga2O3 nanocrystals. The findings suggest the potential use of nanocrystalline gallium oxide in traditional CMOS technology.
Article
Physics, Applied
A. Nelis, I. Vickridge, J. -J. Ganem, E. Briand, G. Terwagne
Summary: The study reveals that the source of oxygen can affect the diffusion of silicon and lead to the out-diffusion and redistribution of silicon during annealing. When oxygen comes from the annealing atmosphere, it forms GeO molecules and enhances the out-diffusion and redistribution of silicon into multiple peaks.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Dongke Li, Jiaming Chen, Teng Sun, Yangyi Zhang, Jun Xu, Wei Li, Kunji Chen
Summary: Phosphorus/boron co-doping in Si quantum dots/SiO2 multilayers enhances subband light emission, with increasing B co-doping ratio resulting in improved emission intensity nearly two orders of magnitude stronger than solely P-doped samples. This enhancement is attributed to B dopants passivating surface dangling bonds, leading to suppressed phosphorus-related deep level emission and appearance of emission centered around 1400 nm in high B co-doping ratios.
Article
Materials Science, Ceramics
M. S. Sutrisno, H. Nurhafizah, N. S. Sabri, R. Hisam
Summary: By investigating the properties of a glass, it was found that the mixed ionic-electronic effect has an influence on the AC conductivity and photoluminescence properties. The minimum AC conductivity and photoluminescence intensity were achieved at a specific Bi2O3 content.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Optics
Matthias Kizmann, Andrey S. Moskalenko, Alfred Leitenstorfer, Guido Burkard, Shaul Mukamel
Summary: Electro-optic sampling is a new quantum technique that allows measurements of electric field fluctuations on subcycle time scales. By imprinting the fluctuations of a terahertz field onto the polarization properties of an ultrashort probe pulse, the statistics of the time-domain signal can be calculated, taking into account the quantum nature of the electric fields. The electro-optic process is described using a microscopic quantum theory, and the quantum response of the nonlinear medium is characterized by interactions mediated by terahertz vacuum fluctuations.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Serguei V. Goupalov
Summary: An analytic equation for the energy dispersion of electronic states in lead chalcogenide nanosheets is derived using an effective mass model. Selection rules for interband optical transitions are analyzed, and the expressions for interband optical matrix elements are obtained. It is demonstrated that the primary effect of lateral confinement in nanoplatelets can be described in terms of the quantized in-plane wave vector.
Article
Physics, Applied
Alfred Leitenstorfer, Andrey S. Moskalenko, Tobias Kampfrath, Junichiro Kono, Enrique Castro-Camus, Kun Peng, Naser Qureshi, Dmitry Turchinovich, Koichiro Tanaka, Andrea G. Markelz, Martina Havenith, Cameron Hough, Hannah J. Joyce, Willie J. Padilla, Binbin Zhou, Ki-Yong Kim, Xi-Cheng Zhang, Peter Uhd Jepsen, Sukhdeep Dhillon, Miriam Vitiello, Edmund Linfield, A. Giles Davies, Matthias C. Hoffmann, Roger Lewis, Masayoshi Tonouchi, Pernille Klarskov, Tom S. Seifert, Yaroslav A. Gerasimenko, Dragan Mihailovic, Rupert Huber, Jessica L. Boland, Oleg Mitrofanov, Paul Dean, Brian N. Ellison, Peter G. Huggard, Simon P. Rea, Christopher Walker, David T. Leisawitz, Jian Rong Gao, Chong Li, Qin Chen, Gintaras Valusis, Vincent P. Wallace, Emma Pickwell-MacPherson, Xiaobang Shang, Jeffrey Hesler, Nick Ridler, Cyril C. Renaud, Ingmar Kallfass, Tadao Nagatsuma, J. Axel Zeitler, Don Arnone, Michael B. Johnston, John Cunningham
Summary: THz radiation covers a wide spectral range and has diverse applications in various scientific disciplines. The demands for advanced THz technology in radio astronomy, weather forecasting, security imaging, telecommunications, and other fields have driven the development of related technologies. It is important to explore both the scientific and technical aspects to meet the growing needs.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
Yaser Hajati, Mohammad Alipourzadeh, Jamal Berakdar
Summary: The interplay between layer pseudospin, spin, and valley degrees of freedom in transition-metal dichalcogenide (TMD) bilayers with electric and exchange fields is studied, resulting in a spin-valley-layer polarized total anomalous Nernst coefficient. The control of spin, valley, and layer-resolved contributions in bilayer TMDs via electric field tuning is determined. This control of layer degree of freedom in bilayer TMDs magnetoelectrically has relevance for possible applications in spin/valley caloritronics.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Optics
Sinan Gundogdu, Stephane Virally, Marco Scaglia, Denis V. Seletskiy, Andrey S. Moskalenko
Summary: A new time-domain method is proposed and analyzed for subcycle metrology of quantum electric fields, which involves a combination of a third order nonlinear optical process and homodyne detection with a local oscillator field. The method allows isolation of weak quantum noise contribution by subtracting the shot noise of the local oscillator on a pulse-by-pulse basis. With the centro-symmetric character of the nonlinearity, this method presents novel opportunities for terahertz and mid-infrared quantum field metrologies.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Elise Prin, Chenghui Xia, Yu-Ho Won, Eunjoo Jang, Serguei V. Goupalov, Philippe Tamarat, Brahim Lounis
Summary: We used frequency- and time-resolved magneto-photoluminescence spectroscopy to investigate the optical properties of single zinc-blende InP/ZnSe/ZnS nanocrystals (NCs). Spectral fingerprints of the band-edge exciton fine structure were obtained and identified, revealing the presence of a ground dark exciton level 0(L) below the bright exciton doublet ±1(L) due to shape anisotropy. These findings match well with a model accounting for the InP core's shape anisotropy. Furthermore, the spectroscopic measurements provide highly sensitive information on the NC morphologies, showing highly uniform shapes with deviations of less than 3% from perfect sphericity.
Article
Physics, Applied
B. Niedzielski, C. L. Jia, J. Berakdar
Summary: In this study, we investigate the propagation of magnons in a micrometer-sized ferromagnetic waveguide that is influenced by the proximity to a superconductor with vortex formation. By solving the time-dependent Ginzburg-Landau equations of superconductivity, we determine the equilibrium state of the vortex configuration and the associated stray fields that affect the magnetic dynamics. We find that the presence of the vortex lattice leads to the formation of a Bloch-like band structure in the magnon spectrum, with the width and number of allowed bands depending on the in-plane component of the vortex field.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Multidisciplinary
Shaohua Yuan, Chaowei Sui, Zhengduo Fan, Jamal Berakdar, Desheng Xue, Chenglong Jia
Summary: The authors use analytical and numerical simulations to demonstrate that magnetic damping in non-Hermitian antiferromagnets allows for the breakdown of magnonic vacuum and the creation of particle-antiparticle pairs in strong magnetic fields. This offers a platform for observing Klein tunneling at meV energies in experimentally feasible settings, with potential applications in chirality-dependent magnonic computing.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Xi-guang Wang, Lu-lu Zeng, Guang-hua Guo, Jamal Berakdar
Summary: This study presents a method for realizing spatiotemporally driven PT-symmetric magnonics and demonstrates the transition between PT-symmetric and broken PT-symmetric phases under different conditions. The magnetization auto-oscillations in the broken PT-symmetric phase occur at low currents and do not require further adjustments, showing potential applications in computing and sensorics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Xi-Guang Wang, Guang-Hua Guo, Jamal Berakdar
Summary: A design for magnetic elements that use excess heat to perform logic operations is presented, allowing for thermal diode and thermal gate operations.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Optics
Lars Meschede, Benjamin Schwager, Dominik Schulz, Jamal Berakdar
Summary: Quantum mechanics is sensitive to the geometry of the underlying space. A framework for quantum scattering of a nonrelativistic particle in a two-dimensional space is presented, where scattering occurs from an emergent geometric potential and the metric tensor field. Analytical and full numerical simulations show that the geometric potential is the primary source for low-energy scattering, while the metric tensor field governs high-energy diffraction.
Article
Materials Science, Multidisciplinary
Z. Toklikishvili, L. Chotorlishvili, R. Khomeriki, V. Jandieri, J. Berakdar
Summary: Electromagnonics is an emerging field focusing on entangling magnonic excitations with microwave cavity photon modes for quantum information science. This study discusses a class of Hamiltonians that enable steady-state photon-magnon entanglement via a chiral coupling of the magnonic system to the cavity electric field. The entanglement can be controlled by external parameters. A layered system with varying interfacial Dzyaloshinskii-Moriya interaction is studied as a realization, demonstrating nonlinear magnon-photon dynamics. The derived expressions from stochastic quantum Langevin equations indicate the existence of steady-state entanglement and its dependencies on external probes, suggesting potential applications in quantum information.
Article
Physics, Multidisciplinary
T. L. M. Guedes, I Vakulchyk, D. V. Seletskiy, A. Leitenstorfer, A. S. Moskalenko, Guido Burkard
Summary: The influence of measurement back action on electro-optic sampling of electromagnetic quantum fluctuations is investigated. Based on a cascaded treatment of the nonlinear interaction between a near-infrared coherent probe and the mid-infrared vacuum, we account for the generated electric-field contributions that lead to detectable back action. The setup parameters at which back action starts to considerably contaminate the measured noise profiles are determined. We find that back action starts to detrimentally affect the signal once the fluctuations due to the coupling to the mid-infrared vacuum become comparable to the base shot noise. Due to the vacuum fluctuations entering at the beam splitter, the shot noise of two incoming probe pulses in different channels is uncorrelated. Therefore, even when the base shot noise dominates the output of the experiment, it does not contribute to the correlation signal itself. However, we find that further contributions due to nonlinear shot-noise enhancement are still present. Ultimately, a regime in which electro-optic sampling of quantum fields can be considered as effectively back-action free is found.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
I. D. Avdeev, S. Goupalov, M. O. Nestoklon
Summary: We present a comprehensive theoretical analysis of the g factors of charge carriers in lead chalcogenide nanocrystals, combining symmetry analysis, atomistic calculations, and extended k·p theory. The linear energy splitting of confined electron states in nanocrystals due to magnetic fields is related to the intravalley g factors of bulk materials, renormalized by quantum confinement. The renormalization is accurately reproduced by analytical expressions derived in the extended k·p model framework.
Article
Quantum Science & Technology
Michael Berger, Jamal Berakdar
Summary: Quantum states of systems with classical chaotic dynamics can be scarred, and this study demonstrates how the scarred state can be imaged to a region that does not support scarring. This phantom scar has a significant impact on the spin-dependent system dynamics, as shown by explicit calculations for fidelity and correlation functions. Numerical simulations and analysis for the spin-dependent electron dynamics in semiconductor-based double quantum dots provide insights into the coherent phenomenon of scarring and its localization properties in a narrow spectral window.
ADVANCED QUANTUM TECHNOLOGIES
(2023)