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Quantum phase transition of the Jaynes-Cummings model

Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 1-9页

作者： Cheng Liu 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 ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsInstitute of Interdisciplinary StudiesHunan Normal UniversityChangsha 410081China

Herein,we propose an experimentally feasible scheme to show the quantum phase transition of the Jaynes-Cummings(JC)model by modulating the transition frequency of a two-level system in a quantum Rabi model with strong *** tuning the modulation frequency and amplitude,the ratio of the effective coupling strength of the rotating terms to the effective cavity(atomic transition)frequency can enter the deep-strong coupling regime,while the counter-rotating terms can be ***,a deep-strong JC model is *** ratio of the coupling strength to resonance frequencies in the deep-strong JC model is two orders of magnitude larger than the corresponding ratio in the original quantum Rabi *** scheme can be employed in atom-cavity resonance and off-resonance cases,and it is valid over a broad *** nonzero average cavity photons of the ground state indicate the emergence of a quantum phase ***,we demonstrate the dependence of the phase diagram on the atom-cavity detuning and modulation *** the parameters used in our scheme are within the reach of current experimental *** scheme provides a new mechanism for investigating the critical phenomena of finite-sized systems without requiring classical field limits,thereby opening a door for studying fundamental quantum phenomena occurring in the ultrastrong and even deep-strong coupling regimes.

关键词： Jaynes-Cummings model quantum phase transition frequency modulation

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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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Anti-parity-time symmetry hidden in a damping linear resonator

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Science China(Physics,Mechanics & Astronomy) 2023年第10期66卷 22-32页

作者： Xun-Wei Xu Jie-Qiao Liao Hui Jing Le-Man Kuang Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China

Phase transition from the over-damping to under-damping states is a ubiquitous phenomenon in physical systems. However, what kind of symmetry is broken associated with this phase transition remains unclear. Here, we discover that this phase transition is determined by an anti-parity-time(anti-PT) symmetry hidden in a single damping linear resonator, which is significantly different from the conventional anti-PT-symmetric systems with two or more modes. We show that the breaking of the anti-PT symmetry yields the phase transition from the over-damping to under-damping states, with an exceptional point(EP) corresponding to the critical-damping state. Moreover, we propose an optomechanical scheme to show this anti-PT symmetry breaking by using the optical spring effect in a quadratic optomechanical system. We also suggest an optomechanical sensor with the sensitivity enhanced significantly around the EPs for the anti-PT symmetry breaking. Our work unveils the anti-PT symmetry hidden in damping oscillations and hence opens up new possibilities for exploiting wide anti-PT symmetry applications in single damping linear resonators.

关键词： anti-parity-time symmetry exceptional points damping linear resonator optomechanics

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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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Deterministic generation of multi-photon bundles in a quantum Rabi model

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Science China(Physics,Mechanics & Astronomy) 2023年第2期66卷 1-12页

作者： Cheng Liu Jin-Feng Huang Lin Tian Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China School of Natural Sciences University of CaliforniaMerced 95343USA

Multi-photon bundle states are crucial for a broad range of applications such as quantum metrology,quantum lithography,quantum communication,and quantum *** we propose a scheme that generates multi-photon bundles via virtual excitations in a quantum Rabi *** approach utilizes a Ξ-type three-level atom,where the upper two levels are coupled to a cavity field to form a quantum Rabi model with ultrastrong coupling,and the transition between the lower two levels is driven by two sequences of Gaussian *** show that the driving pulses induce deterministic emission of multiple photons from the eigenstates of the quantum Rabi model via the stimulated Raman adiabatic passage technique,and hence can create bundles of multiple photons on-demand in the cavity output *** calculate the generalized second-order correlation functions of the output photons,which reveal that the emitted photons form antibunched multi-photon bundles.

关键词： field quantum bundles

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Chiral bound states in a staggered array of coupled resonators

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Chinese Physics B 2024年第2期33卷 124-130页

作者：金伍林李静卢竞龚志瑞周兰 Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory for Matter Microstructure and Function of Hunan ProvinceKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of the Ministry of EducationSynergetic Innovation Center for Quantum Effects and ApplicationsInstitute of Interdisciplinary StudiesXiangjiang-Laboratory and Department of PhysicsHunan Normal UniversityChangsha 410081China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

We study the chiral bound states in a coupled-resonator array with staggered hopping strengths,which interacts with a two-level small atom through a single coupling point or two adjacent *** addition to the two typical bound states found above and below the energy bands,this system presents an extraordinary chiral bound state located within the energy *** use the chirality to quantify the breaking of the mirror *** find that the chirality value undergoes continuous changes by tuning the coupling *** preferred direction of the chirality is controlled not only by the competition between the intracell and the intercell hoppings in the coupled-resonator array,but also by the coherence between the two coupling *** the case with one coupling point,the chirality values varies monotonously with difference between the intracell hopping and the intercell *** in the case with two coupling points,due to the coherence between the two coupling points the perfect chiral states can be obtained.

关键词： bound states two-level small atom coupled-resonator array chirality

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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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Highly efficient pH-universal hydrogen evolution reaction catalyzed by rapidly reconstructed bimetallic cobalt-molybdenum alloy cuboids arrays

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Nano Research 2024年第8期17卷 6977-6983页

作者： Daolian Liu Zihao Wang Yan Zhang Haiqing Zhou Yong Zhang Dongyang Li Fang Yu Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China State Key Laboratory of Marine Resource Utilization in South China Sea and Department of Materials Science and EngineeringHainan UniversityHaikou 570228China Institute of Interdisciplinary Studies Hunan Normal UniversityChangsha 410081China

Given the inherent potential of seawater,industrial wastewater,and residential water as inherent feedstocks for hydrogen production through water electrolysis,there is a critical demand for the exploration of robust and stable hydrogen-evolving catalysts that can operate effectively across a diverse range of pH ***,the pursuit of hydrogen-evolving electrocatalysts that demonstrate both good stability and high efficiency over a wide pH range remains a formidable *** we report the rational design and synthesis of an outstanding nanoporous hybrid electrocatalyst consisting of intermetallic cobalt-molybdenum alloy particles anchoring on MoO2 cuboid arrays,which demands very low overpotentials of 72,123 and 134 mV to deliver a current density of−100 mA·cm^(−2)for hydrogen evolution reaction under alkaline,neutral and acidic conditions,*** catalytic activities are superior to most non-precious-metal-based catalysts documented in the literatures,and are even comparable to noble metal *** particular,this alloy electrocatalyst exhibits excellent stability at 50 or 300 mA·cm^(−2)without obvious activity degradation,which is further supported by the undetectable changes in the surface chemical valence states on the basis of in-situ X-ray photoelectron spectroscopic *** study provides an innovative strategy for the design and synthesis of effective non-noble intermetallic catalysts for pH-universal hydrogen evolution over a wide pH range.

关键词： electrocatalyst hydrogen evolution reaction pH-universal non-noble water splitting

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Non-Markovianity of an atom in a semi-infinite rectangular waveguide

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Chinese Physics B 2023年第3期32卷 102-110页

作者：曾静宋亚菊卢竞周兰 Key Laboratory of Low-Dimensional Quantum Structures and and Quantum Control of the Ministry of Education Department of Physics and Synergetic Innovation Center of Quantum Effects and ApplicationsKey Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha 410081China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421002China

We investigate the non-Markovianity(NM)of a waveguide QED with a two-level atom as the system and a semiinfinite rectangular waveguide as the environment,where the transverse magnetic(TM_(mn))modes define the quantum channels of guided *** perfect mirror imposed by the finite end exerts a retarded feedback mechanism to allow for information backflow,which leads to NM *** the energy separation of the atom far away from the cutoff frequencies of transverse modes,the delay differential equations are obtained with single-excitation initial in the *** attention is focused on the effects of multiple quantum channels involved in guiding photons on the degree of nonMarkovian *** asymptotic value of the non-Markovianity N_(1)can be found as the atom–mirror distance is large enough,however,the asymptotic value of N_(2)of the atom interacting with the effective double-modes is lower than that of the atom interacting with the effective *** also show that N_(1)is a constant,and the analytical expression for N_(2)is related to the parameters associated with the modes,which is related to the interference of the two modes.

关键词： open system non-Markovianity waveguide QED quantum information

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In situ electrochemical dehydrogenation of ultrathin Co(OH)_(2) nanosheets for enhanced hydrogen evolution

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Chinese Chemical Letters 2023年第1期34卷 469-473页

作者： Qian Zhou Qihang Bian Liling Liao Fang Yu Dongyang Li Dongsheng Tang Haiqing Zhou Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationKey Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha 410081China Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan UniversityChangsha 410082China

Transition metal hydroxides/oxyhydroxides have recently emerged as highly active electrocatalysts for oxygen evolution reaction in alkaline water electrolysis,while have not yet been widely investigated for hydrogen evolution electrocatalysts owing to their unfavorable H*-adsorption,making it difficult to construct an overall-water-splitting cell for hydrogen *** this work,we proposed a straightforward and effective approach to develop an efficient in-plane heterostructured CoOOH/Co(OH)_(2) catalyst via in-situ electrochemical dehydrogenation method,in which the dehydrogenated–CoOOH and Co(OH)_(2) at the surface synergistically boost the hydrogen evolution reaction(HER)kinetics in base as confirmed by high-resolution transmission electron microscope,synchrotron X-ray absorption spectroscopy,and electron energy loss *** to the in-situ dehydrogenation of ultrathin Co(OH)_(2) nanosheets,the catalytic activity of the CoOOH/Co(OH)_(2) heterostructures is progressively improved,which exhibit outstanding hydrogen-evolving activity in base requiring a low overpotential of 132 m V to afford 10 m A/cm^(2)with very fast reaction kinetics after 60 h *** gradually improved catalytic performance for the CoOOH/Co(OH)2is probably due to the enhanced H*-adsorption induced by the synergistic effect of heterostructures and better conductivity of Co OOH relative to electrically insulating Co(OH)_(2).This work will open the opportunity for a new family of transition metal hydroxides/oxyhydroxides as active HER catalysts,and also highlight the importance of using in situ techniques to construct precious metal-free efficient catalysts for alkaline hydrogen evolution.

关键词： Hydrogen evolution reaction Transition metal hydroxide In-situ electrochemical dehydrogenation In-plane heterostructure Water splitting

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