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Two-dimensional Janus NbOClI: A promising anisotropic unit for multifunctional optoelectronic devices

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Physical Review B 2025年第15期111卷 155405-155405页

作者： Degao Xu Leimeng Lv Meng Ge Jiansheng Dong Shanjun Chen Chenjie Dai Xianzhuo Wang Jiahua Xu Jianing Tan School of Physics and Optoelectronic Engineering Yangtze University Jingzhou 434023 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 Synergetic Innovation Center for Quantum Effects and Applications (SICQEA) Hunan Normal University Changsha 410081 China Department of Physics Jishou University Jishou 416000 China

Recently, the synthesis of a NbOCl2 monolayer has been reported, revealing notable anisotropic properties and linear dichroism [Guo et al., Nature (London) 613, 53 (2023)]. Inspired by this progress, we have engineered a Janus NbOClI monolayer by breaking the out-of-plane spatial inversion symmetry in NbOCl2. Through rigorous first-principles calculations, we present a detailed and comprehensive investigation of its mechanical and optical characteristics. We find that it exhibits a substantial out-of-plane piezoelectric response (d31=0.87 pm/V), driven by atomic electronegativity differences and Peierls distortion. The intrinsic electric field within NbOClI enables robust photocatalytic water-splitting capabilities across a broad pH spectrum, independent of external strain. Capitalizing on its pronounced linear dichroism, we construct a polarization-sensitive photodetector that leverages the photogalvanic effect to produce an anisotropic, self-powered photocurrent. Notably, this photocurrent is significantly amplified by a strain gradient, achieving self-rectification via the synergistic coupling of flexoelectric and piezoelectric fields. Building upon these achievements, a proof-of-concept three-channel optical communication scheme is shown to amplify the output efficiency of binary signals by an additional 50%. Our results present a fascinating functional coupling architecture that simultaneously enables excellent force-electric conversion, efficient photocatalytic water splitting, polarization-sensitive self-powered photodetection, and multichannel optical communication in Janus NbOClI-based optoelectronic devices. This brings us closer to realizing the next generation of chip-scale integrated optoelectronics.

关键词： Photodetectors

interference trapping of populations in a semi-infinite coupled-resonator waveguide

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arXiv 2025年

作者： Fu, Qinglian Li, Jing Lu, Jing Peng, Zhihui Zhou, Lan 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 Department of Physics Hunan Normal University Changsha410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China

We study the energy structure and dynamics of a two-level emitter (2LE) locally coupled to a semi-infinite one-dimensional (1D) coupled-resonator array (CRA). The energy spectrum in the single-excitation subspace features a continuous band with scattering states, discrete levels with bound states, and a quantum phase transition characterized by the change of the number of bound states. The number of bound states is revealed by the behavior of the excited-state population at long times with quantum beat, residual oscillation, a constant with either non-zero or zero. Copyright © 2025, The Authors. All rights reserved.

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Nonreciprocal routing induced by chirality in an atom-dimer waveguide-QED system

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arXiv 2025年

作者： Liu, Shi-Yu Jiang, Lin-Lin Zhu, Hai Liao, Jie-Qiao Huang, Jin-Feng 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 Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China

The implementation of quantum routers is an important and desired task in quantum information science, since quantum routers are important components of quantum networks. Here, we propose a scheme for implementing single-photon routers in a waveguide-QED system, which consists of two coupled two-level atoms coupled to two waveguides to form a four-port quantum device. We obtain the exact analytical expressions of the single-photon scattering amplitudes using the real-space method. By taking the propagating time of photons between two coupling points into account or not, we consider the system working in the Markovian and non-Markovian regimes, respectively. In addition, we introduce the chiral coupling, which breaks the symmetry of the waveguide model, to manipulate the transmission of single photons. We find that when the system works in the non-Markovian regime, the single photon can be transmitted on demand by adjusting the asymmetry coefficient. More interestingly, the complete single-photon routing in this device does not require an ideal chiral coupling, loosening the photon transport conditions. This work will motivate the studies concerning the nonreciprocal and chiral quantum devices in the waveguide-QED platform. Copyright © 2025, The Authors. All rights reserved.

关键词： Particle beams

Highly sensitive temperature sensing via quadratic optomechanical coupling

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arXiv 2025年

作者： Tang, Yu-Sheng Xu, Xun-Wei Liao, Jie-Qiao Jing, Hui Kuang, Le-Man 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 Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China

The effective frequency of a mechanical resonator can be tuned via the spring effect induced by quadratic optomechanical (QOM) coupling, and both spontaneous symmetry breaking and anti-parity-time phase transition were predicted in the QOM systems. Here, we show that the mechanical susceptibility can be enhanced significantly by driving the QOM system with a strong external optical field, and divergence will happen as the driving strength approaches the critical point (CP) for spontaneous symmetry breaking. Based on the CP, we propose a highly sensitive temperature sensor with a mechanical resonator quadratically coupled to an optical mode. We find that the sensitivity of the temperature sensor can be enhanced by several orders of magnitude as the driving strength approaches the CP, and the sensitivity of the temperature sensor remains high in the low-temperature limit. Our work provides an effective way to realize highly sensitive temperature sensing at ultra-low temperature in the QOM systems. © 2025, CC BY-NC-ND.

关键词： Optomechanics

Deterministic generation of non-classical mechanical states in cavity optomechanics via reinforcement learning

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arXiv 2025年

作者： Liu, Yu-Hong Tan, Qing-Shou Kuang, Le-Man Liao, Jie-Qiao 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 Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communication College of Physics and Electronics Hunan Institute of Science and Technology Yueyang414000 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China

Non-classical mechanical states, as vital quantum resources for exploring macroscopic quantum behavior, have wide applications in the study of the fundamental quantum mechanics and modern quantum technology. In this work, we propose a scheme for deterministically generating non-classical mechanical states in cavity optomechanical systems. By working in the eigen-representation of the nonlinear optomechanical systems, we identify the carrier-wave resonance conditions and seek for the optimal driving pulses for state preparations. Concretely, we employ the reinforcement learning method to optimize the pulsed driving fields, effectively suppressing the undesired transitions induced by both the pulsed driving fields and dissipations. This approach enables the high-fidelity preparation of phononic Fock states and superposed Fock states in the single-resonator optomechanical systems, as well as two-mode entangled states in the two-resonator optomechanical systems. The statistical properties of the generated states are also examined. Our results open a way for quantum state engineering in quantum optics and quantum information science via reinforcement learning. Copyright © 2025, The Authors. All rights reserved.

关键词： Quantum optics

A coupled-channel perspective analysis on bottom-strange molecular pentaquarks

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arXiv 2025年

作者： Song, Qing-Fu Lü, Qi-Fang Xiong, Xiaonu School of Physics Central South University Changsha410083 China Department of Physics Hunan Normal University Changsha410081 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control Ministry of Education Changsha410081 China Key Laboratory for Matter Microstructure and Function of Hunan Province Hunan Normal University Changsha410081 China

At present work, we systematically study various bottom-strange molecular pentaquarks to search for possible bound states and resonances by adopting one-boson-exchange model within complex scaling method. According to our calculations, we predict several bound and resonant states for bottom baryon Yb(Λb,Σb)K¯(∗) and YbK(∗) systems. In particular, a bound state in the I(JP) = 1/2(1/2−) ΣbK¯/ΛbK¯∗/ΣbK¯∗ system may correspond to the particle Ξb(6227). Meanwhile, the predicted bound state with 6303 ~ 6269 MeV in the I(JP) = 1/2(1/2−)ΣbK/ΛbK∗/ΣbK∗ system is flavor exotic and does not appear in the spectroscopy of conventional baryons, which provides a practical way to clarify the nature of particle Ξb(6227). We highly hope that our proposals can offer helpful information for the future experimental searches. Copyright © 2025, The Authors. All rights reserved.

关键词： Molecular modeling

Kerr enhanced optomechanical entanglement via reservoir design

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arXiv 2025年

作者： Li, Yan Liu, Cheng Liu, Yu-Hong Zhou, Yue-Hui Liao, Jie-Qiao 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 Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China School of Information Hunan University of Humanities Science and Technology Loudi417000 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China

Quantum entanglement is a crucial resource in quantum technologies, enabling advancements in quantum computing, quantum communication, and quantum precision measurement. Here, we propose a method to enhance optomechanical entanglement by introducing an optical Kerr nonlinear medium and a squeezed vacuum reservoir of the optomechanical cavity. By performing the displacement and squeezing transformations, the system can be reduced to a standard linearized optomechanical system with normalized driving detuning and linearized-coupling strength, in which the optical and mechanical modes are, respectively, coupled to an optical vacuum bath and a mechanical heat bath. We focus on the entanglement generation in the single stable regime of the system. By evaluating the steady-state logarithm negativity, we find that the optomechanical entanglement can be enhanced within a wide range of the Kerr constant. In addition, the Kerr nonlinearity can extend the stable region, enabling considerable entanglement generation in the blue sideband-parameter region. We also investigate the dependence of the entanglement generation on the average thermal phonon occupation of the mechanical bath and the optical driving amplitude. It is found that the presence of the Kerr nonlinearity allows the generation of optomechanical entanglement even when the thermal phonon occupation of the mechanical bath is as high as 3000. Our findings will provide valuable insights into enhancing fragile quantum resources in quantum systems. Copyright © 2025, The Authors. All rights reserved.

关键词： Quantum entanglement

An analysis on doubly bottom molecular tetraquarks composed of H(s) and T(s) doublets

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arXiv 2025年

作者： Su, Jun-Chao Song, Qing-Fu Lü, Qi-Fang Zhu, Jingya School of Physics and Electronics Henan University Kaifeng475004 China School of Physics Central South University Changsha410083 China Department of Physics Hunan Normal University Changsha410081 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Changsha410081 China Key Laboratory for Matter Microstructure and Function of Hunan Province Hunan Normal University Changsha410081 China

In this work, we investigate the doubly bottom H(s)T¯(s) and H(s)T(s) systems by adopting the one-boson-exchange model, where H(s) and T(s) represent S -wave (formula presented) and P-wave (formula presented) doublets, respectively. For the HT¯ systems, we predict some loosely bound states in the I(JPC) = 0(1−±) BB¯1, (formula presented), I(JPC) = 0(1−±) B∗B¯1 and (formula presented) channels, which are the most promising hidden bottom molecular tetraquarks. For the HT systems, the I(JP) = 0(1−) B∗B1 and (formula presented) channels are also likely to form molecular tetraquarks. In contrast, no molecular candidates have been identified in the bottom-strange sectors. One can hope that our predictions will provide valuable insights to the LHCb and Belle II Collaborations as they continue to explore this fascinating field through experimental research. © 2025, CC BY.

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Structural Insights into Minor and Core Proteins of Bovine Adenovirus 3: Bridging Capsid and Genomic Core

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Journal of Molecular Biology 2025年第17期437卷 169208页

作者： Xiao, Hao Pang, Hao Zhou, Junquan Feng, Hao Song, Jingdong Cheng, Lingpeng Wang, Li Liu, Hongrong Institute of Interdisciplinary Studies Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-dimensional Quantum Structures and Quantum Control School of Physics and Electronics Hunan Normal University Changsha 410081 China College of Life Sciences Hunan Normal University Changsha 410081 China National Institute of Pathogen Biology Chinese Academy of Medical Sciences & Peking Union Medical College Beijing 102629 China

Adenoviruses are double-stranded DNA viruses with broad relevance to human and animal health and considerable potential as therapeutic vectors. Despite extensive studies, the structural details of core and minor capsid proteins in adenoviruses remain poorly understood. In this study, the architecture of bovine adenovirus type 3 (BAdV-3), a member of the Mastadenovirus genus, was solved by cryo-electron microscopy. Our structure shows that BAdV-3 shares significant structural conservation with human adenoviruses. Atomic models were constructed for a previously uncharacterized region of the minor protein VI and for the core proteins V and Mu. The study revealed how core proteins bridge the genome and capsid, underscore the multifaceted roles of protein V in strengthening capsid stability and facilitating genome release. © 2025 Elsevier Ltd

关键词： adenovirus core proteins cryo-electron microscopy minor proteins