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Dipole-moment modulation of photovoltaic and photoresponse properties in 2H-MoSSe/MoS2 van der Waals heterojunctions under electric field

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Science China(Information Sciences) 2025年第5期68卷 417-418页

作者： Yinkang WANG Meng GE Jianing TAN Biao CAI Gang OUYANG Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal University All-solid-state Energy Storage Materials and Devices Key Laboratory of Hunan Province College of Information and Electronic Engineering Hunan City University

The intrinsic dipole moment introduces a novel degree of freedom for engineering the photoelectric properties of twodimensional （2D） Janus transition metal dichalcogenides（J-TMDs）-based van der Waals heterojunctions （vdWHs）[1,2].However,the theoretical relationship and underlying modulation mechanisms governing the photoelectric properties of J-TMD-based vdWHs under external electric fields（E-fields） remain unclear,hindering the advancement of nanoscale optoelectronic ***,we develop a theoretical model and investigate the combined effects of intrinsic dipole and external E-fields on the photoelectric properties of 2H-MoSSe/*** approach integrates the atomic-bond-relaxation （ABR） method [3],Marcus theory [4],detailed balance principle （DBP）[5],and ab initio nonadiabatic molecular dynamics （NAMD） simulations.

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Combining intrinsic and sliding-induced polarizations for multistates in two-dimensional ferroelectrics

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Physical Review B 2025年第8期111卷 L081407-L081407页

作者： Chuhan Tang Zhiqiang Tian Tao Ouyang Anlian Pan Mingxing Chen Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education School of Physics and Electronics Hunan Normal University Changsha 410081 China Hunan Key Laboratory for Micro-Nano Energy Materials and Device and School of Physics and Optoelectronics Xiangtan University Hunan Xiangtan 411105 China Key Laboratory for Micro-Nano Physics and Technology of Hunan Province College of Materials Science and Engineering Hunan University Changsha 410082 China State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China

Going beyond the bistability paradigm of the charge polarization in ferroelectrics is highly desired for ferroelectric (FE) memory devices toward ultrahigh-density information storage. Here, we propose to build multistates by combining the intrinsic and sliding-induced polarizations. The physics is that there is at least one order of magnitude difference in the energy barriers between these two types of polarizations, which leads to a significant difference in the electric fields for reversing the polarization. This difference, along with the symmetry breaking, allows for a unique flipping mechanism involving layer-by-layer sliding followed by layer-by-layer flipping during the transformation of the multistates. As a result, six and ten switchable states can be achieved for the 1T″ bilayers and trilayers, respectively. We further illustrate the concept in H-stacking bilayers and trilayers of 1T″ transition-metal dichalcogenides by first-principles calculations. Our study provides a route to design polarization multistates for developing next-generation memory devices.

关键词： Ferroelectricity

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Reveal short range interactions between u/d quarks in the NN,D_(03),and D_(30)systems

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Science China(Physics,Mechanics & Astronomy) 2025年第3期68卷 102-111页

作者： Qi-Fang Lü Yu-Bing Dong Peng-Nian Shen Zong-Ye Zhang Department of Physics Hunan Normal UniversityChangsha410081China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Changsha410081China Key Laboratory for Matter Microstructure and Function of Hunan Province Hunan Normal UniversityChangsha410081China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China School of Physical Sciences University of Chinese Academy of SciencesBeijing101408China

The dynamic mechanism of short range interactions between u/d quarks remains an open and challenging *** order to reveal this quark dynamics,we perform a systematic analysis of N N,D_(03),and D_(30)systems in the(extended)chiral SU(3)constituent quark *** comparing results calculated with different models and different parameter sets,the effects of one gluon exchange and vector meson exchange terms are carefully *** results indicate that the vector meson exchange interactions dominate the short range interactions between u/d quarks,whereas the small residual one gluon exchange coupling strength is also allowed.

关键词： short range interactions dibaryons constituent quark models

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Chiral-cat-state generation via the Sagnac-Fizeau effect

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Physical Review A 2025年第2期111卷 023702-023702页

作者： Yu-Hong Liu Xian-Li Yin Hui Jing Le-Man Kuang Jie-Qiao Liao Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha 410081 China

Chiral quantum state generation is an interesting topic in quantum physics and quantum information science. Here we propose an approach for generating chiral cat states in a spinning resonator supporting both the clockwise (CW) and counterclockwise (CCW) traveling modes, which are dispersively coupled to a two-level atom. The physical mechanism for the chiral-cat-state generation is based on the Sagnac-Fizeau effect. Concretely, when the resonator is rotating, the CW and CCW modes have different frequency detuning with respect to the atomic transition frequency and hence the atomic-state-dependent rotating angular velocities for the CW and CCW modes in phase space are different. This mode-dependent evolution leads to a chirality mechanism in the state generation. Based on the mode-dependent conditional rotation evolution and atomic projection measurement at proper time, we achieve the separate generation of cat states in the CW mode and coherent states in the CCW mode. We also investigate quantum coherence properties of the generated states by examining their Wigner functions. In addition, the influence of the system dissipations on the state generation in the open-system case is investigated. Our work will provide some insights into the development of chiral optical devices and nonreciprocal photonics.

关键词： Atoms

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Controlling the superradiant phase transition in the quantum Rabi model

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Physical Review A 2025年第2期111卷 023708-023708页

作者： Xuan Xie Cheng Liu Lin-Lin Jiang Jin-Feng Huang Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha 410081 China

In the ultrastrong-coupling regime, the quantum Rabi model can exhibit quantum phase transition (QPT) when the ratio of the qubit transition frequency to the frequency of the cavity field approaches infinity. However, it is challenging to control the QPT in few-body systems because of the limited coupling strength and the A2 term. Here, we propose a practical scheme to manipulate the QPT of quantum Rabi model in the strong-coupling regime. By applying a periodic frequency modulation to the two-level system in a quantum Rabi model in the strong-coupling regime, an anisotropic quantum Rabi model with ultrastrong and tunable coupling strengths for rotating and counterrotating terms is obtained. The ground state and excitation energy of this model, in terms of the modulation parameters, are studied. We find that the QPT of the quantum Rabi model can be observed in the strong-coupling regime and externally controlled by the modulation.

关键词： Excitation energy

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Single-photon scattering in giant-atom topological-waveguide-QED systems

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Physical Review A 2025年第2期111卷 023711-023711页

作者： Hai Zhu Xian-Li Yin Jie-Qiao Liao Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha 410081 China

The giant-atom topological-waveguide-QED systems have recently emerged as a promising platform for manipulating light-matter interactions. The combination of the multiple-point couplings and topological phase effect could lead to rich physical phenomena and effects. Here, we study single-photon scattering in a Su-Schrieffer-Heeger (SSH) waveguide coupled to either one or two two-level giant atoms. We assume that each giant atom is coupled to the waveguide via two coupling points and hence there exist four and sixteen coupling configurations for the single-giant-atom case and two-giant-atom separate coupling case, respectively. By solving the single-photon scattering problem in the real space, we obtain the exact expressions of the single-photon scattering amplitudes. It is found that a single photon in the SSH waveguide can be completely reflected or transmitted by choosing proper coupling configurations, coupling-point distances, atomic resonance frequency, and dimerization parameter. In addition, under proper parameter conditions, the scattering spectra are periodically modulated by the coupling-point distances. We also find that the collective behavior of the two giant atoms can be adjusted by quantum interference effect and topological effect and that the single-photon scattering spectra can exhibit the Lorentzian, super-Gaussian, electromagnetically induced transparencylike, and asymmetric Fano line shapes for some coupling configurations. This work will inspire the development of controllable single-photon devices based on the giant-atom topological-waveguide-QED systems.

关键词： Photons

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Coherent control of spontaneous emission for a giant driven Λ-type three-level atom

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Physical Review A 2025年第1期111卷 013707-013707页

作者： Ya Yang (杨亚) Ge Sun (孙葛) Jing Li (李静) Jing Lu (卢竞) Lan Zhou (周兰) School of Physics and Chemistry Hunan First Normal University Changsha 410205 China Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education School of Physics and Electronics Hunan Normal University Changsha 410081 China

Quantum optics with giant atoms provides a new approach for implementing optical memory devices at the atomic scale. Here, we theoretically investigate the relaxation dynamics of a single driven three-level atom interacting with a one-dimensional waveguide via two coupling points. Under certain conditions, after long-time dynamics, we find that the population of the giant atom can either remain stable or exhibit regular periodic oscillations, while photons are trapped within the region of the giant atom. This phenomenon cannot be realized using a two-level atom configured with two coupling points. It is noteworthy that the atomic excitation probability of a stable bound state is a constant value, which is determined by the size of the atom. Importantly, the size of the atom, defined as the distance between the two coupling points, is significantly larger than the wavelength of the light field, which is a necessary condition for the existence of oscillating bound states.

关键词： Atoms

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KPROJ: A program for unfolding electronic and phononic bands

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Computer Physics Communications 2025年 312卷

作者： Chen, Jiaxin Weinert, M. Chen, Mingxing School of Physics and Electronics Hunan Normal University Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Changsha410081 China Department of Physics University of Wisconsin MilwaukeeWI53211 United States

We introduce a program named KPROJ that unfolds the electronic and phononic band structure of materials modeled by supercells. The program is based on the k-projection method, which projects the wavefunction of the supercell onto the k-points in the Brillouin zone of the artificial primitive cell. It allows for obtaining an effective "local" band structure by performing partial integration over the k-projected wavefunctions, e.g., the unfolded band structure with layer-projection for interfaces and the weighted band structure in the vacuum for slabs. The layer k-projection is accelerated by a scheme that combines the Fast Fourier Transform (FFT) and the inverse FFT algorithms. It is now interfaced with several first-principles codes based on plane waves such as VASP, Quantum Espresso, and ABINIT. In addition, it also has interfaces with ABACUS, a first-principles simulation package based on numerical atomic basis sets, and PHONOPY, a program for phonon calculations. Program summary: Program Title: KPROJ CPC Library link to program files: https://***/10.17632/f6n5phpy8f.1 Developer's repository link: https://***/mxchen-2020/kproj Licensing provisions: GPLv3.0 Programming language: Fortran 90 Nature of problem: Supercells are widely used to model doped systems and interfaces within the framework of first-principles methods. However, the use of supercells causes band folding, which is unfavorable for understanding the effects of doping and interfacing on the band structure of materials. Moreover, the folding also brings difficulties in explaining the results of angle-resolved photoemission spectroscopy experiments. Solution method: This program is designed to calculate the unfolded band structure for systems modeled by supercells. The unfolding is performed by projecting the wave functions of the supercell onto the k-points in the BZ of the primitive cell. The projector operator is built by the translation operator and its irreducible representation. The lay

关键词： FORTRAN (programming language)

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Cavity-modified oscillating bound states with a Λ-type giant emitter in a linear waveguide

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Physical Review A 2025年第3期111卷 033701-033701页

作者： Ge Sun (孙葛) Ya Yang (杨亚) Jing Li (李静) Jing Lu (卢竞) Lan Zhou (周兰) Key Laboratory of Low-Dimension Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Synergetic Innovation Center for Quantum Effects and Applications Xiangjiang-Laboratory and Department of Physics Hunan Normal University Changsha 410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha 410081 China School of Physics and Chemistry Hunan First Normal University Changsha 410205 China

We study a system composed of a three-level giant atom (3GA), a waveguide initially in the vacuum state, and a single-mode cavity. The 3GA-cavity system is in a strong-coupling regime, and the distance between the coupling points is comparable to the coherent length of a spontaneously emitted photon. The dynamics of the 3GA and its radiative field in the waveguide for long times are analyzed in each subspace with only one excitation exchanged between the waveguide and the 3GA cavity. Besides the steady value, we also found an oscillatory character of the excited-state population, a signature of oscillating bound states which is generated by the superposition of two bound states in the continuum. The radiative field propagates in the cavitylike geometry formed by the coupling points. When one bound state is emergent, a sinelike interference pattern is visible for the emitted photon distribution in spacetime. An oscillatory character in time and a beat in space for the emitted photon distribution are observed when two bound states are emergent in a subspace. The wavelengths and the periods are controlled by the number of photons in the cavity.

关键词： Waveguides

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Regulating electron effect by interface-induced dislocation in Fe2P/Fe to accelerate oxygen reduction reactions

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Materials Today Physics 2025年 54卷

作者： Yan, Jin Li, Shiyu Liu, Meihuan Zhou, Haiqing Su, Hui Key Laboratory of Light Energy Conversion Materials of Hunan Province College College of Chemistry and Chemical Engineering Hunan Normal University Hunan Changsha410081 China State Key Laboratory for Powder Metallurgy Central South University Hunan Changsha410083 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China

Achieving precise control of the electronic environment of transition metal compounds is important for improving the efficiency of electrocatalytic oxygen reduction reaction (ORR) but continues a formidable challenge. Herein, we present a novel Fe2P/Fe heterostructure catalyst with abundant dislocation defects, where the oxidation state of Fe shift from 0.11 to 0.97, leading to an enhanced ORR performance. In situ FTIR and DFT showed that the dislocation-rich heterojunction catalysts enhanced the desorption of ∗OOH intermediates, facilitated the hydrogenation process of ∗O, and improved the kinetic process of the 4e− reaction. Consequently, the developed Fe2P/Fe catalyst exhibited a mass activity of 164.3 A gmetal−1, which is over three times greater than the traditional Pt/C catalyst that measured 53.6 A gmetal−1, highlighting its remarkable efficacy. This significant activity enhancement was accompanied by 99.56 % 4e− selectivity and half-slope potential (E1/2 = 0.90 V). In addition, the catalyst also performs excellent power density (150.4 mW cm−2) in zinc-air batteries (ZABs) and maintains long-term stability after 130 h of continuous charging and discharging. This work on dislocation-rich non-noble metal catalysts provides new insights into oxygen reduction catalysts. © 2025 Elsevier Ltd

关键词： Zinc air batteries

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