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Low-frequency divergence of circular photomagnetic effect in topological semimetals

Physical Review B 2024年第4期110卷 L041114-L041114页

作者： Jin Cao Chuanchang Zeng Xiao-Ping Li Maoyuan Wang Shengyuan A. Yang Zhi-Ming Yu Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Research Laboratory for Quantum Materials

Novel fermions with relativistic linear dispersion can emerge as low-energy excitations in topological semimetal materials. Here, we show that the orbital moment contribution in the circular photomagnetic effect for these topological semimetals exhibit an unconventional ω−1 frequency scaling, leading to significantly enhanced response in the infrared window, which can be orders of magnitude larger than previous observations on conventional materials. Furthermore, the response tensor is directly connected to the Chern numbers of the emergent fermions, manifesting their topological character. Our work reveals a new signature of topological semimetals and suggests them as promising platforms for optoelectronics and spintronics applications.

关键词： Light-induced magnetic effects Light-matter interaction Semimetals Band structure methods Symmetries in condensed matter

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Joint Authentication Public Network Cryptographic key Distribution Protocol Based on Single Exposure Compressive Ghost Imaging

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Chinese Physics Letters 2024年第2期41卷 47-56页

作者：俞文凯王硕飞商克谦 Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement of Ministry of EducationSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China

In the existing ghost-imaging-based cryptographic key distribution(GCKD)protocols,the cryptographic keys need to be encoded by using many modulated patterns,which undoubtedly incurs long measurement time and huge memory *** this,based on snapshot compressive ghost imaging,a public network cryptographic key distribution protocol is proposed,where the cryptographic keys and joint authentication information are encrypted into several color block diagrams to guarantee *** transforms the previous single-pixel sequential multiple measurements into multi-pixel single exposure measurements,significantly reducing sampling time and memory *** simulation and experimental results demonstrate the feasibility of this protocol and its ability to detect illegal ***,it takes GCKD a big step closer to practical applications.

关键词： ghost Ghost Authentication

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Gate-field control of valley polarization in valleytronics

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Chinese Physics B 2024年第6期33卷 2-12页

作者：张婷婷韩依琳张闰午余智明 Institute of Physics Chinese Academy of SciencesBeijing 100190China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Valleytronics materials are a kind of special semiconductors which can host multiple symmetry-connected and wellseparated electron or hole pockets in the Brillouin zone when the system is slightly n or p doped. Since the low-energy particles residing in these pockets generally are not easily scattered to each other by small perturbations, they are endowed with an additional valley degree of freedom. Analogous to spin, the valley freedom can be used to process information,leading to the concept of valleytronics. The prerequisite for valleytronics is the generation of valley polarization. Thus,a focus in this field is achieving the electric generation of valley polarization, especially the static generation by the gate electric field alone. In this work, we briefly review the latest progress in this research direction, focusing on the concepts of the couplings between valley and layer, i.e., the valley–layer coupling which permits the gate-field control of the valley polarization, the couplings between valley, layer, and spin in magnetic systems, the physical properties, the novel designing schemes for electronic devices, and the material realizations of the gate-controlled valleytronics materials.

关键词： band structure electronic transport optical properties spintronics

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Enhanced N_(2)electroreduction activity of single-atom catalysts:Modulating the linear scaling relationship by coordination engineering and dual-site strategies

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Nano Research 2025年第3期18卷 696-709页

作者： Renyi Li Caimu Wang Jiao Zhang Wei Guo Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Frontiers Science Center for High Energy Material(MOE) Beijing Institute of TechnologyBeijing 100081China

The volcano plot is widely used to elucidate the activity trends among different catalysts,thereby effectively screening and guiding catalyst ***,the inherent linear scaling relationship(LSR)constrains the breakthrough in the activity of catalysts,and the understanding of the activity limit in volcano plot is still *** this work,by employing first-principles calculations and microkinetic modeling,we proposed coordination engineering(CE)and dual-site(DS)strategies to surpass the Sabatier’s limitation of WS_(2)-supported TM(TM@WS_(2))single-atom catalysts(SACs)for electrocatalytic nitrogen reduction reaction(eNRR).We found that the LSR betweenΔG(^(*)N_(2)→^(*)N_(2)H)andΔG(^(*)NH_(2)→^(*)NH_(3))was optimized to be closer to the ideal space of eNRR activity after modulating TM@WS_(2)SACs by these two design *** combining the reaction selectivity trend plot,we picked out N-Os@WS_(2),C-Ir@WS_(2),Fe_(2)@WS_(2),and Ru_(2)@WS_(2)as optimal eNRR catalysts with low limiting potential(UL),and N-Os@WS_(2)SAC(UL:-0.28 V)outperforms the best eNRR catalyst among TM@WS_(2)*** constructing explicit solvent models,we conducted a detailed study on the reaction kinetics of proton transfer over these four *** propose that the activity enhancement in TM@WS_(2)SACs for eNRR can be attributed to the ligand effect and geometric effect brought about by CE and DS strategies,improving the donation-backdonation process of electron transfer between N_(2)and the active *** designed catalyst has certain resistance to demetallization and agglomeration under simulated solvent *** work provides a feasible design strategy for the activity enhancement of SACs and brings a new perspective to deeply understanding the volcano plot in heterogeneous catalysis.

关键词： linear scaling relationship volcano plot single-atom catalysts density functional theory(DFT) electrochemical nitrogen reduction

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Valley polarization in twisted altermagnetism

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Physical Review B 2024年第22期110卷 L220402-L220402页

作者： San-Dong Guo Yichen Liu Junxi Yu School of Electronic Engineering Xi'an University of Posts and Telecommunications Xi'an 710121 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China

The combination of altermagnetism, twistronics, and valleytronics is of great significance for potential applications in advanced electronic devices. Twisted magnetic van der Waals bilayers have been identified as an ideal platform for altermagnetism of any type, such as d wave, g wave, and i wave, by choosing the constituent monolayer with specific symmetry [Y. Liu et al., Phys. Rev. Lett. 133, 206702 (2024)]. Here, we propose a way for achieving valley polarization in twisted altermagnetism by applying an out-of-plane external electric field. Since the out-of-plane electric field creates a layer-dependent electrostatic potential, the valleys from different layers will stagger, producing valley polarization. We also demonstrate the effectiveness of our proposed way using the twisted tight-binding model. It is found that the applied electric field can also induce a valley/spin-gapless semiconductor and half metal besides valley polarization. Based on first-principles calculations, our proposed way to achieve valley polarization can be verified in twisted bilayer VOBr and monolayer Ca(CoN)2 as a special twisted altermagnet. These findings provide different opportunities for innovative spintronics, twistronics, and valleytronics applications.

关键词： Magnetism Twistronics Valley degrees of freedom

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Anti-aging performance improvement and enhanced combustion efficiency of boron via the coating of PDA

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Defence Technology（防务技术） 2024年第3期33卷 399-410页

作者： Shuai Ma Qinghai Shu Mengyang Zhang Hongyu Huang Yansong Shi Xijuan Lv Shuai Zhao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(MOE) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing100081China Tangshan Research Institute of Beijing Institute of Technology Tangshan063000HebeiChina

Boron is an ambitious fuel in energetic materials since its high heat release values,but its application is prohibited by low combustion efficiency and oxidization during *** polydopamine(PDA)was introduced into boron particles,investigating the impact of PDA content on the energetic behavior of *** results indicated that the PDA coating formed a fishing net structure on the surface of boron *** heat release results showed that the combustion calorific value of B@PDA was higher than that of the raw ***,the actual combustion heat of boron powder in B@10%PDA increased by 38.08%.Meanwhile,the DSC peak temperature decreased by 100.65℃under similar oxidation rate compared to raw ***,the B@PDA@AP and B@AP composites were prepared,and their combustion properties were *** was demonstrated that B@10%PDA@AP exhibited superior performance in terms of peak pressure and burning time,*** peak pressure is 12.43 kPa more than B@AP and burning time is 2.22 times higher than B@***,the coating of PDA effectively inhibits the oxidization of boron during storage and enhances the energetic behavior of boron and corresponding composites.

关键词： Boron particles Polydopamine Anti-aging performance improvement Heat release

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Electrochemical control of photoelectric performance in WS2/WSe2van der Waals heterostructures device 13

Electrochemical control of photoelectric performance in WS2/...

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13th Global Conference on Materials Science and Engineering, CMSE 2024

作者： Wang, Linghan Wang, Qinsheng Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement School of Physics Beijing Institute of Technology Beijing100081 China

Electrochemical intercalation is an effective method for modulating the physical properties of materials, extensively utilized in optimizing device performance in two-dimensional materials. However, research about the modulation on the optoelectronic performance is still lacking. Here, we demonstrate using lithium-ion intercalation to modulate the optoelectronic performance of WS2/WSe2 heterojunction. We observe a significant increase of device conductivity (approximately 50x) after lithium-ion intercalation. At the same time, the peak responsivity increases by 8 times and can be modulated from 8 mA/W to -6 mA/W, accompanied with a reversal of photocurrent direction. No phase transitions are observed throughout the intercalation process by Raman spectroscopy. The variations in photocurrent response are attributed to the injection of free charge carriers and the corresponding alterations in the band structure. Our work paves the way for modulating the optoelectronic performance of two-dimensional materials with electrochemical intercalation. © Published under licence by IOP Publishing Ltd.

关键词： Van der Waals forces

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Background removal, computational ghost tracking, and follow-up ghost imaging of a moving target

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Chinese Optics Letters 2025年第05期 46-51页

作者：俞文凯张培哲杨颖魏宁 Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement of Ministry of EducationSchool of PhysicsBeijing Institute of Technology

Ghost imaging has shown promise for tracking the moving target,but the requirement for adequate measurements per motion frame and the image-dependent tracking process limit its ***,we propose a background removal differential model based on asymptotic gradient patterns to capture the displacement of a translational target directly from single-pixel *** staring at the located imaging region,we evenly distribute optimally ordered Hadamard basis patterns to each frame;thus,the image can be recovered from fewer intraframe measurements with gradually improved *** makes ghost tracking and imaging more suitable for practical applications.

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Strongly nonlinear topological phases of cascaded topoelectrical circuits

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Frontiers of physics 2023年第3期18卷 51-58页

作者： Jijie Tang Fangyuan Ma Feng Li Honglian Guo Di Zhou College of Science Minzu University of ChinaBeijing 100081China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Circuits provide ideal platforms of topological phases and matter,yet the study of topological circuits in the strongly nonlinear regime,has been *** propose and experimentally demonstrate strongly nonlinear topological phases and transitions in one-dimensional electrical circuits composed of nonlinear *** topological interface modes arise on domain walls of the circuit lattices,whose topological phases are controlled by the amplitudes of nonlinear voltage *** measured topological transition amplitudes are in good agreement with those derived from nonlinear topological band *** prototype paves the way towards flexible metamaterials with amplitude-controlled rich topological phases and is readily extendable to two and three-dimensional systems that allow novel applications.

关键词： strongly nonlinear Berry phase topological electrical

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Rechargeable Metasurfaces for Dynamic Color Display Based on a Compositional and Mechanical Dual-Altered Mechanism

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Research 2023年第1期2022卷 367-377页

作者： Le Yang Xiaorong Hong Jiafang Li Chang-Yin Ji Yu Han Shanshan Chen Hanqing Jiang Wei-Li Song Hao-Sen Chen Daining Fang Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures Institute of Advanced Structure TechnologyBeijing Institute of TechnologyBeijing 100081China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics e Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Engineering Westlake UniversityHangzhou 310024China

Dynamic color display can be realized by tunable optical metasurfaces based on the compositional or structural ***,it is still a challenge to realize the efficient modulation by a single-field ***,we report a novel compositional and mechanical dual-altered rechargeable metasurface for reversible and broadband optical reconfiguration in both visible and near-infrared wavelength *** employing a simple fabrication and integration strategy,the continuous optical reconfiguration is manipulated through an electro-chemo-mechanical coupled process in a lithium ion battery,where lithiation and delithiation processes occur dynamically under a low electric voltage(<1.5 V).By controlling the phase transformation from Si to Li,Si,both structural morphology and optical scattering could be rapidly and dramatically tailored within 30s,exhibiting high-contrast colorization and decolorization in a large-area nanofilm and showing long cyclic *** wide-angle reconfiguration of high-resolution structural colors in bowtie metasurfaces is demonstrated from anomalous *** results provide a multifield mechanism for reconfigurable photonic devices,and the new platform can be introduced to the multidimensional information encryption and storage.

关键词： scattering figuration Dynamic

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