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Highly sensitive gas sensing material for polar gas molecule based on Janus group-Ⅲ chalcogenide monolayers: A first-principles investigation

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Science China(Technological Sciences) 2020年第8期63卷 1566-1576页

作者： PANG KaiJuan WEI YaDong LI WeiQi ZHOU Xin jiang YingJie YANG JianQun LI XingJi GAO Lang jiang yongyuan School of Physics Harbin Institute of TechnologyHarbin 150001China School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin 150080China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Gas sensors play an indispensable role in industrial,personal safety and environmental protection,and have been widely investigated by *** some cases,the sensitivity of a two-dimensional material sensor can be enhanced by generating vacancies or applying an external electric *** results can be achieved using Janus 2D materials,which have an inherent electric field and are good candidates for high-sensitivity gas *** this study,the electronic and transport properties of Janus group-Ⅲchalcogenide monolayers(Ga2SSe,In2SSe)were investigated for detecting CO2 and NO2 using first-principles *** several parameters that affect the performance of gas sensors,such as adsorption distances,adsorption energies,charge transfers and density of states(DOS),a detailed comparison of Janus group-Ⅲchalcogenide monolayers has been provided with their pristine systems,Janus group-Ⅲchalcogenide monolayers(Ga2SSe,In2SSe)have high *** was mainly ascribed to the built-in electric field caused by the out-of-plane asymmetric structure of Janus monolayer which enhances the dipole-dipole interaction between the polar gas molecule and the 2D *** the variation of transmission spectra of the Janus group-Ⅲchalcogenide monolayer before and after adsorbing molecules further proves the feasibility of this kind of material as a high-sensitivity gas sensor.

关键词： group-III chalcogenide monolayers gas sensors transmission spectrum electronic structure first-principles calculations

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Unselective ground-state blockade of Rydberg atoms for implementing quantum gates

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Frontiers of physics 2022年第2期17卷 33-45页

作者： Jin-Lei Wu Yan Wang Jin-Xuan Han Shi-Lei Su Yan Xia yongyuan jiang Jie Song School of Physics Harbin Institute of TechnologyHarbin 150001China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Department of Physics Fuzhou UniversityFuzhou 350002China

A dynamics regime of Rydberg atoms,unselective ground-state blockade(UGSB),is proposed in the context of Rydberg antiblockade(RAB),where the evolution of two atoms is suppressed when they populate in an identical ground *** is used to implement a SWAP gate in one step without individual addressing of *** at circumventing common issues in RAB-based gates including atomic decay,Doppler dephasing,and fluctuations in the interatomic coupling strength,we modify the RAB condition to achieve a dynamical SWAP gate whose robustness is much greater than that of the nonadiabatic holonomic one in the conventional RAB *** addition,on the basis of the proposed SWAP gates,we further investigate the implementation of a three-atom Fredkin gate by combining Rydberg blockade and *** present work may facilitate to implement the RAB-based gates of strongly coupled atoms in experiment.

关键词： Rydberg atoms unselective ground-state blockade SWAP gate Fredkin gate

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Unidirectional acoustic metamaterials based on nonadiabatic holonomic quantum transformations

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Science China(Physics,Mechanics & Astronomy) 2022年第2期65卷 30-38页

作者： JinLei Wu Shuai Tang Yan Wang XiaoSai Wang JinXuan Han Cheng Lü Jie Song ShiLei Su Yan Xia yongyuan jiang School of Physics Harbin Institute of TechnologyHarbin 150001China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Department of Physics Fuzhou UniversityFuzhou 350002China

Nonadiabatic holonomic quantum transformations(NHQTs)have attracted wide attention and have been applied in many aspects of quantum computation,whereas related research is usually limited to the field of quantum *** we bring NHQTs into constructing a unidirectional acoustic metamaterial(UDAM)for shaping classical *** UDAM is made up of an array of three-waveguide couplers,where the propagation of acoustic waves mimics the evolution of *** excellent agreement among analytical predictions,numerical simulations,and experimental measurements confirms the great applicability of NHQTs in acoustic metamaterial *** present work extends research on NHQTs from quantum physics to the field of classical waves for designing metamaterials with simple structures and may pave a new way to design UDAMs that would be of potential applications in acoustic isolation,communication,and stealth.

关键词： acoustic metamaterial waveguide coupler holonomic quantum transformation

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High Efficiency Bridge Double PhaseConjugation in PhotorefractiveTb: Cu: KNSBN Crystal

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Chinese Journal of Lasers 1997年第1期B6卷 71-75页

作者： SUN Xiudong ZHOU Zhongxiang ZHAO Hua LI Yanqiu jiang yongyuan XU Kebin(Department of Applied Physics, Harbin Institute of Technology,Harbin 150001, China) Harbin Inst of Technology Harbin China

An experimental study of bridge double phase conjugate mirror with a photorefractive Tb: Cu:KNSBN crystal was presented. The dependence of phase conjugate reflectivity and transmission on the input intensity ratio was... 详细信息

关键词： mutually pumped phase conjugation bridge double phase conjugate mirror photorefractive crystal

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Teaching Model Integrating Online and Offline in Real Time ——An Exploration of New Teaching Mode for Regular Epidemic Prevention and Control

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计算机教育 2022年第12期 106-113页

作者： Ce Zhang yongyuan jiang Peng Liu Meng Wei Academic Affairs Office Harbin Institute of Technology(Weihai)Weihai264209China School Office Harbin Institute of Technology(Weihai)Weihai264209China

During epidemic,students in medium-risk or high-risk areas are unable to return to school on *** response to this new challenge,there is an urgent need to create a new teaching mode to offer on-line courses to those absent from the offline classes,and we propose a model integrating online and offline *** is based on“dual-camera”method,which allows off-campus students to virtually build up a physical classroom scenario on campus through computers and mobile *** this model,students can participate in class *** order to enhance the engagement of off-campus online students,emphasis is placed on interactive *** are required to design their teaching in advance and to work in collaboration with multiple departments,then using information technology and suitable teaching methods to enable students to participate in physical classroom *** model has been tested in practice and has been successful in meeting the ***,4 areas for improvement and refinement are identified.

关键词： Epidemic prevention and control New normal state MOOC Online and offline integrated teaching model

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Enhancing sensitivity to ambient refractive index with tunable few-layer graphene/hBN nanoribbons

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Photonics Research 2019年第7期7卷 130-137页

作者： Huan jiang Sajid Choudhury Zhaxylyk A.Kudyshev Di Wang Ludmila J.Prokopeva Peng Xiao yongyuan jiang Alexander V.Kildishev Institute of Modern Optics Department of PhysicsHarbin Institute of TechnologyHarbin 150001China School of Electrical and Computer Engineering and Birck Nanotechnology Center Purdue UniversityWest Lafayette Indiana 47907USA School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Key Laboratory of Micro-Optics and Photonic Technology of Heilongjiang Province Harbin 150001China Key Laboratory of Micro-Nano Optoelectronic Information System of Ministry of Industry and Information Technology Harbin 150001China

Refractive index (RI) sensing helps to identify biomolecules and chemicals in the mid-infrared range for drug discovery, bioengineering, and environmental monitoring. In this paper, we numerically demonstrate an electrically tunable RI sensor with ultrahigh sensitivity using a three-layer graphene nanoribbon array separated by hexagonal boron nitride (hBN). Unlike the weak resonance in single-layer graphene nanoribbons, a much stronger plasmon resonance featuring a higher-quality factor can be excited in the graphene/hBN few-layer ribbon array. Simultaneously, the high purity of graphene on hBN results in an outstanding charge mobility above 4 ×10^4 cm^2 · V^-1·s^-1 at 300 K, which allows a larger modulation depth. The interaction between the locally enhanced field around graphene ribbons and its surrounding analyte leads to ultrahigh sensitivity (4.207μm/RIU), with the figure of merit reaching approximately ***, this ultrasensitive detector could selectively work in different wavebands by controlling gate voltages applied to *** merits of ultrahigh sensitivity and electrical tunability are major advances compared to previous RI sensors, paving a way toward ultrasensitive detection using graphene/hBN few-layer devices.

关键词： Enhancing sensitivity refractive index nanoribbons

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One-step implementation of Rydberg-antiblockade SWAP and controlled-SWAP gates with modified robustness

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Photonics Research 2021年第5期9卷 814-821页

作者： JIN-LEI WU YAN WANG JIN-XUAN HAN YU-KUN FENG SHI-LEI SU YAN XIA yongyuan jiang JIE SONG School of Physics Harbin Institute of TechnologyHarbin 150001China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Department of Physics Fuzhou UniversityFuzhou 350002China

The prevalent fashion of executing Rydberg-mediated two-and multi-qubit quantum gates in neutral atomic systems is to pump Rydberg excitations using multistep piecewise pulses in the Rydberg blockade ***, we propose to synthesize a Λ-type Rydberg antiblockade(RAB) of two neutral atoms using periodic fields,which facilitates one-step implementations of SWAP and controlled-SWAP(CSWAP) gates with the same gate time. Besides, the RAB condition is modified so as to circumvent the sensitivity of RAB-based gates to infidelity factors, including atomic decay, motional dephasing, and interatomic distance deviation. Our work makes up the absence of one-step schemes of Rydberg-mediated SWAP and CSWAP gates and may pave a way to enhance the robustness of RAB-based gates.

关键词： Rydberg neutral modified

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Response analysis of NMRG system considering Rb-Xe coupling

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Chinese Physics B 2024年第9期33卷 390-402页

作者： Yi Zhang Qiyuan jiang Bingfeng Sun Jiahu Wei Lin Yang yongyuan Li Zhiguo Wang Kaiyong Yang Hui Luo College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China Huaguan Technology Co. Ltd.Changsha 410100China

The dynamic range of the nuclear magnetic resonance gyroscope can be effectively improved through the closedloop control scheme,which is crucial to its application in inertial *** paper presents the analytical transfer function of Xe closed-loop system in the nuclear magnetic resonance gyroscope considering Rb–Xe coupling *** not only considers the dynamic characteristics of the system more comprehensively,but also adds the influence of the practical filters in the gyro signal processing system,which can obtain the accurate response characteristics of signal frequency and amplitude at the same *** numerical results are compared with an experimentally verified simulation program,which indicate great *** research results of this paper are of great significance to the practical application and development of the nuclear magnetic resonance gyroscope.

关键词： nuclear magnetic resonance gyroscope transfer characteristics Rb–Xe coupling

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