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Self-powered solar-blind photodiodes based on EFG-grown(100)-dominant β-Ga_(2)O_(3) substrate

Chinese Physics B 2021年第1期30卷 483-486页

作者： Xu-Long Chu Zeng Liu Yu-Song Zhi Yuan-Yuan Liu Shao-Hui Zhang Chao Wu Ang Gao Pei-Gang Li Dao-You Guo Zhen-Ping Wu Wei-Hua Tang Laboratory of Information Functional Materials and Devices School of Science&State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijing 100876China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China The Engineering Research Center for Semiconductor Integrated Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China China Aerospace System Simulation Technology Co. Ltd.(Beijing)Beijing 100195China Division of Interdisciplinary and Comprehensive Research&Platform for Characterization and Test Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Center for Optoelectronics Materials and Devices&Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210046China

We report the edge-defined-film-fed(EFG)-grown β-Ga_(2)O_(3)-based Schottky *** device has a reverse leakage current of ~nA and a rectified ratio of ~10^(4) at ±5 *** addition,the photodiode detector shows a dark current of 0.3 pA,a photo-responsivity(R) of 2.875 mA/W,a special detectivity(D*) of 10^(10) Jones,and an external quantum efficiency(EQE) of 1.4% at zero bias,illustrating a self-powered *** work may advance the development of the Ga_(2)O_(3)-based Schottky diode solar-blind photodetectors.

关键词： β-Ga_(2)O_(3)substrate Schottky photodiode solar-blind detection

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Origin of the Diagonal Double-Stripe Spin-Density-Wave and Potential Superconductivity in Bulk La3Ni2O7 at Ambient Pressure

arXiv

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arXiv 2024年

作者： Liu, Yu-Bo Sun, Hongyi Zhang, Ming Liu, Qihang Chen, Wei-Qiang Yang, Fan School of Physics Beijing Institute of Technology Beijing100081 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China International Quantum Academy Shenzhen518048 China Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China Department of Physics Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen518055 China

The discovery of high-temperature superconductivity (SC) with Tc ≈ 80 K in the pressurized La3Ni2O7 has aroused great interests. Currently, due to technical difficulties, most experiments on La3Ni2O7 can only be performed at ambient pressure (AP). Particularly, various experiments have revealed the presence of spin density wave (SDW) in the unidirectional diagonal double-stripe pattern with wave vector near ±(π/2, π/2) in La3Ni2O7 at AP. In this work, we employ first-principle calculations followed by the random phase approximation (RPA)-based study to clarify the origin of this special SDW pattern and the potential SC in La3Ni2O7 at AP. Starting from our density-functional-theory band structure, we construct an eight-band bilayer tight-binding model using the Ni-3dz2 and 3dx2−y2 orbitals, which is equipped with the standard multi-orbital Hubbard interaction. Our RPA calculation reveals an SDW order driven by Fermi-surface nesting with wave vector Q ≈ (0, ±0.84π) in the folded Brillouin zone (BZ). From the view of the unfolded BZ, the wave vector turns to Q0 ≈ ±(0.58π, 0.58π), which is near the one detected by various experiments. Further more, this SDW exhibits an interlayer antiferromagnetic order with a unidirectional diagonal double-stripe pattern, consistent with recent soft X-ray scattering experiment. This result suggests that the origin of the SDW order in La3Ni2O7 at AP can be well understood in the itinerant picture as driven by Fermi surfaces nesting. In the aspect of SC, our RPA study yields an approximate s±-wave spin-singlet pairing with Tc much lower than that under high pressure. Further more, the Tc can be strongly enhanced through hole doping, leading to possible high-temperature SC at AP. © 2024, CC BY.

关键词： Spin density waves

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Coherent-cluster-state generation in networks of degenerate optical parametric oscillators

arXiv

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arXiv 2023年

作者： Zhou, Zheng-Yang Gneiting, Clemens You, J.Q. Nori, Franco Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics ZSTU Hangzhou310018 China Theoretical Quantum Physics Laboratory Cluster for Pioneering Research RIKEN Saitama Wakoshi351-0198 Japan Beijing Computational Science Research Center Beijing100094 China Center for Quantum Computin RIKEN Saitama Wakoshi351-0198 Japan Interdisciplinary Center of Quantum Information State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Device School of Physics Zhejiang University Hangzhou310027 China Center for Quantum Computing RIKEN Saitama Wakoshi351-0198 Japan Physics Department The University of Michigan Ann ArborMI48109-1040 United States

Cluster states are versatile quantum resources and an essential building block for measurement-based quantum computing. The possibility to generate cluster states in specific systems may thus serve as an indicator regarding if and to what extent these systems can be harnessed for quantum technologies and quantum information processing in particular. Here, we apply this analysis to networks of degenerate optical parametric oscillators (DOPOs), also called coherent Ising machines (CIMs). CIMs are distinguished by their highly flexible coupling capabilities, which makes it possible to use them, e.g., to emulate large spin systems. As CIMs typically operate with coherent states (and superpositions thereof), it is natural to consider cluster states formed by superpositions of coherent states, i.e., coherent cluster states. As we show, such coherent cluster states can, under ideal conditions, be generated in DOPO networks with the help of beam splitters and classical pumps. Our subsequent numerical analysis provides the minimum requirements for the generation of coherent cluster states under realistic conditions. Moreover, we discuss how nonequilibrium pumps can improve the generation of coherent cluster states. In order to assess the quality of the cluster-state generation, we map the generated states to an effective spin space using modular variables, which allows us to apply entanglement criteria tailored for spin-based cluster states. Copyright © 2023, The Authors. All rights reserved.

关键词： quantum entanglement

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controlled longitudinal spin-orbit separation of complex vector modes

arXiv

引用

arXiv 2023年

作者： Hu, Xiao-Bo Zhao, Bo Chen, Rui-Pin Rosales-Guzmán, Carmelo Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China Wang Da-Heng Collaborative Innovation Center for Quantum Manipulation & Control Harbin University of Science and Technology Harbin150080 China Centro de Investigaciones en Óptica A.C. Loma del Bosque 115 Colonia Lomas del campestre Gto. León37150 Mexico

Complex vector modes, entangled in spin and orbital angular momentum, are opening burgeoning opportunities for a wide variety of applications. Importantly, the flexible manipulation the various properties of such beams will pave the way to novel applications. As such, in this manuscript, we demonstrate a longitudinal spin-orbit separation of complex vector modes propagating in free space. To achieve this we employed the recently demonstrated circular Airy Gaussian vortex vector (CAGVV) modes, which feature a self-focusing property. More precisely, by properly manipulating the intrinsic parameters of CAGVV modes, the strong coupling between the two constituting orthogonal components of CAGVV mode undergo a spin-orbit separation along the propagation direction namely, while one polarisation component, focuses at a specific plane, the other focuses at a different plane. Such spin-orbit separation, which we demonstrated by numerical simulations and corroborated experimentally, can be adjusted on-demand by simply changing the initial parameters of CAGVV modes. Our findings will be of great relevance, for example in optical tweezers, to manipulate micro- or nano-particles at two different parallel planes. Copyright © 2023, The Authors. All rights reserved.

关键词： optical tweezers

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Spin-density wave and superconductivity in La4Ni3O10 under ambient pressure

arXiv

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arXiv 2024年

作者： Zhang, Ming Sun, Hongyi Liu, Yu-Bo Liu, Qihang Chen, Wei-Qiang Yang, Fan Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China International Quantum Academy Shenzhen518048 China School of Physics Beijing Institute of Technology Beijing100081 China Department of Physics Guangdong Basic Research Center of Excellence for Quantum Science Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen518055 China

We investigate the spin-density wave (SDW) behavior and the potential for superconductivity (SC) in La4Ni3O10 under ambient pressure using a multi-orbital random-phase approximation (RPA). Starting with a twelve-orbital tight-binding model derived from density functional theory (DFT) calculations, we explore the influence of Hubbard interactions on SDW formation. Our analysis reveals a stripe-like SDW characterized by an incommensurate wave vector, Q ≈ (±0.7π, 0), suggesting a possible density wave instability in agreement with recent experiments. This configuration is driven by nesting of outer-layer Ni dz2 orbitals and exhibits interlayer antiferromagnetic ordering between the top and bottom NiO layers, with the middle layer serving as a node. We demonstrate that the Hund’s coupling JH is the primary driver of the observed SDW. While superconductivity is absent in the undoped system under ambient pressure, it becomes attainable with appropriate hole doping (δ = -0.4), resulting in a SC gap structure similar to the high-pressure phase. Our study identifies the specific conditions for realizing the ambient pressure stripe density wave: JH > 0.16U. Additionally, when doping leads to sufficient nesting at (0,0), the system’s magnetic fluctuations transition into a stable Néel-type antiferromagnetic state, analogous to the high-pressure case. © 2024, CC BY.

关键词： Spin density waves

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End superconductivity and three critical temperatures in Fibonacci quasicrystals

arXiv

引用

arXiv 2024年

作者： Zhu, Quanyong Zha, Guo-Qiao Shanenko, A.A. Chen, Yajiang School of Mathematics and Computer Science Lishui University Lishui323000 China Physics Department Shanghai Key Laboratory of High Temperature Superconductors Shanghai University Shanghai200444 China HSE University Moscow101000 Russia Moscow Center for Advanced Studies Kulakova str. 20 Moscow123592 Russia Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China

Recently, the superconducting properties of Fibonacci quasicrystals have attracted considerable attention. By numerically solving the self-consistent Bogoliubov-de Gennes equations for a Fibonacci chain under superconducting proximity, we find that the system exhibits universal end superconductivity, where the pair potential at the chain ends can persist at higher temperatures compared to the bulk critical temperature (Tcb) of the condensate in the chain center. Furthermore, our study reveals two distinct critical temperatures at the left end (TcL) and right end (TcR), governing the superconducting condensate at the chain ends. This complex behavior arises from the competition between topological bound states and critical states, a characteristic of quasicrystals. Due to the geometric configuration of Fibonacci chain approximants, TcL and Tcb are independent of the Fibonacci sequence number n, while TcR significantly depends on the parity of n. With the chosen parameters, the maximal enhancement of TcR occurs for even n, reaching up to 50% relative to Tcb, while TcL can increase by up to 23%. Our study sheds light on the phenomenon of end superconductivity in Fibonacci quasicrystals, pointing to alternative pathways for discovering materials with higher superconducting critical temperatures. Copyright © 2024, The Authors. All rights reserved.

关键词： Quasicrystals

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Generation of arbitrary abruptly autofusing circular Airy Gaussian vortex vector modes

arXiv

引用

arXiv 2022年

作者： Hu, Xiao-Bo Zhao, Bo Chen, Rui-Pin Rosales-Guzmán, Carmelo Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China Wang Da-Heng Collaborative Innovation Center for Quantum manipulation & Control Harbin University of Science and Technology Harbin150080 China Centro de Investigaciones en Óptica A.C. Loma del Bosque 115 Colonia Lomas del campestre Guanajuato LeónC.P. 37150 Mexico

Complex vector modes represent a general state of light nonseparable in their spatial and polarization degrees of freedom, which have inspired a wide variety of novel applications and phenomena, such as their unexpected propagation behaviour. For example, they can propagate describing periodic polarization transitions, changing from one vector beam to another. Here, we put forward a novel class of vector modes with the capability to experience an abruptly autofocusing behaviour. To achieve such beams, we encode the spatial degree of freedom in the Circular Airy Gaussian vortex (CAGV) beams. We demonstrate the experimental generation of arbitrary CAGV vector beams and evince some of their properties, such as a rotation of intermodal phase. We anticipate that the fascinating properties of theses modes will prompt the development of novel applications associated to their autofocusing behaviour and polarization distribution. Copyright © 2022, The Authors. All rights reserved.

关键词： Polarization

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Resource-Efficient Direct Characterization of General Density Matrix

引用

Physical Review Letters 2024年第3期132卷 030201-030201页

作者： Liang Xu Mingti Zhou Runxia Tao Zhipeng Zhong Ben Wang Zhiyong Cao Hongkuan Xia Qianyi Wang Hao Zhan Aonan Zhang Shang Yu Nanyang Xu Ying Dong Changliang Ren Lijian Zhang College of Metrology & Measurement Engineering China Jiliang University Hangzhou 310018 China National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulation College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Research Center for Quantum Sensing Zhejiang Lab Hangzhou 310000 China School of Electronic Control Chang’an University Xi’an 710064 China Quantum Optics and Laser Science Blackett Laboratory Imperial College London Prince Consort Road London SW7 2AZ United Kingdom 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

Sequential weak measurements allow for the direct extraction of individual density-matrix elements, rather than relying on global reconstruction of the entire density matrix, which opens a new avenue for the characterization of quantum systems. Nevertheless, extending the sequential scheme to multiqudit quantum systems is challenging due to the requirement of multiple coupling processes for each qudit and the lack of appropriate precision evaluation. To address these issues, we propose a resource-efficient scheme (RES) that directly characterizes the density matrix of general multiqudit systems while optimizing measurements and establishing a feasible estimation analysis. In the RES, an efficient observable of the quantum system is constructed such that a single meter state coupled to each qudit is sufficient to extract the corresponding density-matrix element. An appropriate model based on the statistical distribution of errors is utilized to evaluate the precision and feasibility of the scheme. We have experimentally applied the RES to the direct characterization of general single-photon qutrit states and two-photon entangled states. The results show that the RES outperforms sequential schemes in terms of efficiency and precision in both weak- and strong-coupling scenarios. This Letter sheds new light on the practical characterization of large-scale quantum systems and the investigation of their nonclassical properties.

关键词： optical quantum information processing quantum foundations quantum measurements quantum tomography Weak values & weak measurements Weak measurements

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Spin-orbital-angular-momentum-coupled quantum gases

arXiv

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arXiv 2022年

作者： Peng, Shi-Guo Jiang, Kaijun Chen, Xiao-Long Chen, Ke-Ji Zou, Peng He, Lianyi State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430071 China Center for Cold Atom Physics Chinese Academy of Sciences Wuhan430071 China Department of Physics Key Laboratory of Optical Field Manipulation of Zhejiang Province Zhejiang Sci-Tech University Hangzhou310018 China College of Physics Qingdao University Qingdao266071 China Department of Physics State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua University Beijing100084 China

We briefly review the recent progress of theories and experiments on spin-orbital-angular-momentum (SOAM)-coupled quantum gases. The coupling between the intrinsic degree of freedom of particles and their external orbital motions widely exists in the universe, and leads to a broad variety of fundamental phenomena in both classical physics and quantum mechanics. The recent realization of synthetic SOAM coupling in cold atoms has attracted a great deal of attention, and stimulated a large amount of considerations on exotic quantum phases in both Bose and Fermi gases. In this review, we present a basic idea of engineering SOAM coupling in neutral atoms, starting from a semiclassical description of atom-light interaction. Unique features of single-particle physics in the presence of SOAM coupling are discussed. The intriguing ground-state quantum phases of weakly interacting Bose gases are introduced, with emphasis on a so-called angular stripe phase, which has not yet been observed at present. It is demonstrated how to generate a stable giant vortex in a SOAM-coupled Fermi superfluid. We also discuss the topological characters of a Fermi superfluid in the presence of SOAM coupling. We then introduce the experimental achievement of SOAM coupling in 87Rb Bose gases and its first observation of phase transitions. The most recent development of SOAM-coupled Bose gases in experiments is also summarized. Regarding the controllability of ultracold quantum gases, it opens a new era, from the quantum simulation point of view, to study the fundamental physics resulting from SOAM coupling as well as newly emergent quantum phases. © 2022, CC BY.

关键词： Degrees of freedom (mechanics)

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Near-field radiative heat transfer between hybrid polaritonic structures

arXiv

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arXiv 2022年

作者： Iqbal, Naeem Zhang, Sen Wang, Shuai Fang, Zezheng Hu, Yaoyuan Dang, Yongdi Zhang, Minjie Jin, Yi Xu, Jianbin Ju, Binfeng Ma, Yungui State Key Lab of Modern Optical Instrumentation Centre for Optical and Electromagnetic Research College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University China The State Key Lab of Fluid Power Transmission and Control School of Mechanical Engineering Zhejiang University Hangzhou310027 China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou China Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong

Near-field radiative heat transfer between close objects may exceed the far-field blackbody radiation in orders of magnitude when exploiting polaritonic materials. Great efforts have been made to experimentally measure this fundamental stochastic effect but mostly based on simple materials. In this work, we foster an all-optical method to characterize the heat transfer between less explored plasmon-phonon hybrid polaritonic systems made of graphene-SiC heterostructures. A large heat flux about 26 times of the blackbody radiation limit is obtained over a 150-nm vacuum gap, attributed to the couplings of three different surface modes (plasmon, phonon polaritons and frustrated mode). The interaction of polaritonic modes in the hybrid system is also explored to build a switchable thermophotonic device with nearly unity heat flux tunability. This work paves the way for understanding mode-mediated near-field heat transfer and provides a platform for building thermophotonic or thermo-optoelectronic blocks for various applications. © 2022, CC BY.

关键词： Radiative transfer

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