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Electronic origin of the unusual thermal properties of copper-based semiconductors:The s-d coupling-induced large phonon anharmonicity

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Science China(Physics,Mechanics & Astronomy) 2023年第7期66卷 112-119页

作者： Kaike Yang Huai Yang Yujia Sun Zhongming Wei Jun Zhang ping-heng tan Jun-Wei Luo Shu-Shen Li Su-Huai Wei Hui-Xiong Deng State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceSynergetic Innovation Center for Quantum Effects and ApplicationsDepartment of PhysicsHunan Normal UniversityChangsha 410081China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Beijing Computational Science Research Center Beijing 100193China

Copper(Cu)-based materials(such as cuprates,Cu chalcogenides,and Cu halides)often exhibit unusual properties such as superconductivity,ultralow thermal conductivity,and ***,the electronic origin of these unusual behaviors remains *** this study,we demonstrate that the high-lying occupied 3d orbital of Cu causes a strong s-d coupling with its unoccupied 4s state when local symmetry is *** leads to strong phonon anharmonicity and is responsible for these intriguing *** example,during thermal transport,symmetry-controlled s-d coupling can substantially lower the lattice potential barrier,thereby enhancing the anharmonicity and scattering between phonons and ultimately significantly reducing lattice thermal *** confirmed this understanding with Raman spectra measurements,which demonstrated a remarkable red shift in the phonon vibrational frequency with an increase in the temperature of Cu-based *** study shows that the cause of phonon anharmonicity is related to the fundamental electronic structures,which can also explain other unusual physical properties of the Cu compounds.

关键词： anharmonicity copper-based semiconductor electronic structure thermal conductivity

High-performance polarization-sensitive photodetectors on two-dimensional β-InSe

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National Science Review 2022年第5期9卷 30-36页

作者： Zhinan Guo Rui Cao Huide Wang Xi Zhang Fanxu Meng Xue Chen Siyan Gao David K.Sang Thi Huong Nguyen Anh Tuan Duong Jinlai Zhao Yu-Jia Zeng Sunglae Cho Bing Zhao ping-heng tan Han Zhang Dianyuan Fan Institute of Microscale Optoelectronics International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology College of Physics and Optoelectronic EngineeringShenzhen University Institute of Nanosurface Science and Engineering Guangdong Provincial Key Laboratory of MicroNano Optomechatronics EngineeringShenzhen University State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences Department of Physics and Energy Harvest-Storage Research Center University of Ulsan State Key Laboratory of Supramolecular Structure and Materials Jilin University

Two-dimensional(2D) indium selenide(InSe) has been widely studied for application in transistors and photodetectors,which benefit from its excellent optoelectronic *** the three specific polytypes(γ-,ε-and β-phase) of InSe,only the crystal lattice of InSe in β-phase(β-InSe) belongs to a non-symmetry point group of D6 h~4,which indicates stronger anisotropic transport behavior and potential in the polarized photodetection of β-InSe-based optoelectronic ***,we prepare the stable p-type 2D-layered β-InSe via temperature gradient *** anisotropic Raman,transport and photoresponse properties of β-InSe have been experimentally and theoretically proven,showing that theβ-InSe-based device has a ratio of 3.76 for the maximum to minimum dark current at two orthogonal orientations and a high photocurrent anisotropic ratio of 0.70 at 1 V bias voltage,*** appealing anisotropic properties demonstrated in this work clearly identify β-InSe as a competitive candidate for filter-free polarization-sensitive photodetectors.

关键词： 2D materials polarization photodetectors

Preparation of maximally-entangled states with multiple cat-state qutrits in circuit QED

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Frontiers of physics 2024年第3期19卷 239-251页

作者： Chui-ping Yang Jia-heng Ni Liang Bin Yu Zhang Yang Yu Qi-ping Su Department of Physics Hangzhou Normal UniversityHangzhou 311121China School of Physics Nanjing UniversityNanjing 210093China Institute for Quantum Science and Technology University of CalgaryAlberta T2N 1N4Canada

In recent years,cat-state encoding and high-dimensional entanglement have attracted much ***,previous works are limited to generation of entangled states of cat-state qubits(two-dimensional entanglement with cat-state encoding),while how to prepare entangled states of cat-state qutrits or qudits(high-dimensional entanglement with cat-state encoding)has not been *** here propose to generate a maximally-entangled state of multiple cat-state qutrits(three-dimensional entanglement by cat-state encoding)in circuit *** entangled state is prepared with multiple microwave cavities coupled to a superconducting flux ququart(a four-level quantum system).This proposal operates essentially by the cavity-qutrit dispersive *** circuit hardware resource is minimized because only a coupler ququart is *** higher intermediate level of the ququart is occupied only for a short time,thereby decoherence from this level is greatly suppressed during the state ***,the state preparation time does not depend on the number of the qutrits,thus it does not increase with the number of the *** an example,our numerical simulations demonstrate that,with the present circuit QED technology,the high-fidelity preparation is feasible for a maximally-entangled state of two cat-state ***,we numerically analyze the effect of the inter-cavity crosstalk on the scalability of this *** proposal is universal and can be extended to accomplish the same task with multiple microwave or optical cavities coupled to a natural or artificial four-level atom.

关键词： maximally-entangled states cat state qutrit circuit QED

Layer-number dependent high-frequency vibration modes in few-layer transition metal dichalcogenides induced by interlayer couplings

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Journal of Semiconductors 2017年第3期38卷 53-58页

作者： Qing-Hai tan Xin Zhang Xiang-Dong Luo Jun Zhang ping-heng tan State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Jiangsu Key Laboratory of ASIC Design Nantong University

Two-dimensional transition metal dichalcogenides（TMDs） have attracted extensive attention due to their many novel *** atoms within each layer in two-dimensional TMDs are joined together by covalent bonds,while van der Waals interactions combine the layers *** makes its lattice dynamics layer-number *** evolutions of ultralow frequency（〈 50 cm^（-1）） modes,such as shear and layer-breathing modes have been ***,we review the layer-number dependent high-frequency（〉 50 cm^（-1）） vibration modes in few-layer TMDs and demonstrate how the interlayer coupling leads to the splitting of high-frequency vibration modes,known as Davydov *** Davydov splitting can be well described by a van der Waals model,which directly links the splitting with the interlayer *** review expands the understanding on the effect of interlayer coupling on the high-frequency vibration modes in TMDs and other two-dimensional materials.

关键词： transition metal dichalcogenides Raman spectroscopy interlayer coupling Davydov splitting van der Waals model

Breakdown of Raman selection rules by Frohlich interaction in few-layer WS_(2)

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Nano Research 2021年第1期14卷 239-244页

作者： Qing-Hai tan Yu-Jia Sun Xue-Lu Liu Kai-Xuan Xu Yuan-Fei Gao Shu-Liang Ren ping-heng tan Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsCenter of Materials Science and Optoelectronics EngineeringCAS Center of Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100083China Beijing Academy of Quantum Information Science Beijing 100193China

The polarization selection rule of Raman scattering is crucial in symmetry analysis of elementary excitations in semiconductors and correlated electron *** we reported the observation of breakdown of Raman selection rules in few-layer WS_(2) by using resonant Raman *** the excitation energy is close to the dark A exciton state,we observed some infrared active modes and backscattering forbidden ***,we found that all observed phonon modes follow the same paralleled-polarization *** to the electron-phonon coupling near the band edge in WS_(2),we proposed a theoretical model based on the intraband Frohlich *** this case,the polarization response of the scattering signal is no longer determined by the original Raman tensor of scattered ***,it is determined by a new isotropic Raman tensor that generated from this intraband Frohlich interaction between dark A exciton and *** found that this theoretical model is in excellent agreement with the observed *** breakdown of Raman selection rules can violate the conventional limitations of the optical response and provide an effective method to control the polarization of Raman scattering signals in two-dimensional materials.

关键词： WS_(2) resonant Raman scattering dark exciton Raman section rules Frohlich interaction

Photoluminescence of CdSe Nanowires Grown With and Without Metal Catalyst

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Nano Research 2011年第4期4卷 343-359页

作者： Andrea Fasoli Alan Colli Faustino Martelli Simone Pisana ping heng tan Andrea C. Ferrari Department of Engineering University of Cambridge Cambridge CB3 0FA UK Nokia Research Centre Broers Building （East Forum） Cambridge CB3 0GT UK lstituto per la Microelettronica e i Microsistemi del CNR 00133 Rome Italy SKLSM Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China

我们 CdSe nanowires 上的现在的温度和力量依赖者光致发光大小有或没有金属催化剂的使用经由蒸汽阶段综合了。没有催化剂，生产的 Nanowires 能被优化产出更高的量效率，和更狭窄、空间地一致的排放，当时与帮助催化剂的相比。在比乐... 详细信息

我们 CdSe nanowires 上的现在的温度和力量依赖者光致发光大小有或没有金属催化剂的使用经由蒸汽阶段综合了。没有催化剂，生产的 Nanowires 能被优化产出更高的量效率，和更狭窄、空间地一致的排放，当时与帮助催化剂的相比。在比乐队边低的精力的排放也在两个盒子中被发现。由在一样的 nanowires 上联合空间地解决的光致发光和电子显微镜学，我们证明没有催化剂的 nanowires 与锋利的声子复制品展出一座低精力的山峰，而为帮助催化剂的 nanowires 低精力的排放与扩大词法缺点被连接到 nanostructures 的存在。

关键词：金属催化剂光致发光 CdSe 纳米线生长催化剂生产电子显微镜低能量

Seismic safety assessment with non-Gaussian random processes for train-bridge coupled systems

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 241-260页

作者： Zhao Han Gao Lei Wei Biao tan Jincheng Guo Peidong Jiang Lizhong Xiang ping Key Laboratory of Geomechanics and Embankment Engineering of Ministry of Education Hohai UniversityNanjing 210024China School of Civil Engineering Central South UniversityChangsha 410075China

Extensive high-speed railway(HSR)network resembled the intricate vascular system of the human body,crisscrossing *** events,known for their unpredictability,pose a significant threat to both trains and bridges,given the HSR’s extended operational ***,ensuring the running safety of train-bridge coupled(TBC)system,primarily composed of simply supported beam bridges,is *** methods like the Monte Carlo method fall short in analyzing this intricate system ***,efficient algorithm like the new point estimate method combined with moment expansion approximation(NPEM-MEA)is applied to study random responses of numerical simulation TBC *** of the NPEM-MEA’s feasibility is conducted using the Monte Carlo *** analysis confirms the accuracy and efficiency of the method,with a recommended truncation order of four to six for the ***,the influences of seismic magnitude and epicentral distance are discussed based on the random dynamic responses in the TBC *** methodology not only facilitates seismic safety assessments for TBC systems but also contributes to standard-setting for these systems under earthquake conditions.

关键词： train-bridge coupled(TBC)system random vibration new point estimate method(NPEM) seismic safety assessment moment expansion approximation(MEA) non-Gaussian distributions

Double plasma molecular adsorption system for Stevens–Johnson syndrome/toxic epidermal necrolysis:A case report

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World Journal of Clinical Cases 2024年第7期12卷 1371-1377页

作者： You-Wen tan Li-ping Liu Kai Zhang Department of Hepatology The Third Hospital of Zhenjiang Affiliated Jiangsu UniversityZhenjiang 212003Jiangsu ProvinceChina

BACKGROUND Stevens–Johnson syndrome and toxic epidermal necrolysis(SJS/TEN)are very serious skin allergies,with an etiology related to infections and *** the coronavirus disease 2019(COVID-19)pandemic,severe acute respiratory syndrome coronavirus-2 has also been considered to cause SJS/*** SUMMARY We report the case of a woman in her thirties who took acetaminophen after contracting *** 3 d of fever relief,she experienced high fever and presented with SJS/TEN symptoms,accompanied by intrahepatic *** days of corticosteroid treatment did not alleviate the skin damage;therefore,double plasma molecular adsorption system(DPMAS)therapy was initiated,with treatment intervals of 48 *** skin symptoms improved gradually and were resolved after seven DPMAS *** DPMAS therapy is beneficial for abrogating SJS/TEN because plasma adsorption and perfusion techniques reduce the inflammatory mediators(e.g.,tumor necrosis factor-alpha and interleukin-10 and-12)speculated to be involved in the pathology of the skin conditions.

关键词： Stevens-Johnson Toxic epidermal necrolysis COVID-19 Double plasma molecular adsorption system SARS-CoV-2 Case report

Effect of drying cracks on swelling and self-healing of bentonite-sand blocks used as engineered barriers for radioactive waste disposal

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1776-1787页

作者： Yu tan Guangping Zhou Huyuan Zhang Xiaoya Li ping Liu School of Civil Engineering and Mechanics Lanzhou UniversityLanzhou730000China Key Laboratory of Mechanics on Disaster and Environment in Western China (Lanzhou University) Ministry of EducationLanzhou730000China Civil and Environmental Engineering University of Wisconsin-MadisonWI53706USA

Experiments were conducted to evaluate the healing of drying cracks in air-dried bentonite-sand blocks after hydration and swelling in groundwater,providing justifications to simplify the protection of blocks prior to installation in a high-level radioactive waste *** groundwater was prepared to represent the geochemistry of Beishan groundwater,and was used to hydrate the blocks during the swelling pressure and swelling strain measurements,as Beishan is the most promising site for China's *** of the surface cracks was recorded by photography,and healing of the internal cracks was visualized by CT images and hydraulic conductivity of air-dried *** results indicate that the maximum swelling pressure and swelling strain are primarily affected by the geochemistry of Beishan groundwater,but not affected by the drying *** maximum swelling pressure and swelling strain of air-dried blocks are comparable to or even higher than the pressure and strain of fresh *** maximum swelling pressure measured in strong(*** ion strength)Beishan groundwater was 44%of the pressure measured in deionized(DI)water,and the maximum swelling strain was reduced to 23%of the strain measured in DI ***,the remained swelling of the blocks hydrated in strong Beishan groundwater was sufficient to heal the surface and internal drying cracks,as demonstrated by the pictures of surface cracks and CT *** hydraulic conductivity of the air-dried block permeated with strong groundwater was comparable(3.7×higher)to the hydraulic conductivity of the fresh block,indicating the self-healing of drying cracks after hydration and swelling in groundwater.A simplified method of protecting the block with plastic wraps before installation is recommended,since the remained swelling of the block hydrated in Beishan groundwater is sufficient to heal the drying cracks.

关键词： Beishan groundwater chemistry Bentonite buffer Drying cracks High-level radioactive waste(HLW) Self-healing Swelling