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Cooper instability and superconductivity of the Penrose lattice

Science China(physics,Mechanics & Astronomy) 2022年第8期65卷 110-120页

作者： Yu-Bo Liu Juan-Juan Hao Yongyou Zhang Ye Cao Wei-Qiang Chen Fan Yang School of physics Beijing Institute of TechnologyBeijing100081China department of physics Southern University of Science and TechnologyShenzhen518055China shenzhen Institute for quantum Science and Engineering Southern University of Science and TechnologyShenzhen518055China shenzhen key laboratory of advanced quantum functional materials and devices Southern University of Science and TechnologyShenzhen518055China

Bulk superconductivity(SC) has recently been observed in the Al-Zn-Mg quasicrystal(QC). To settle several fundamental issues of the SC on the QC, we use an attractive Hubbard model to perform a systematic study on the Penrose lattice. The first issue is the Cooper instability of the QC, i.e., no Fermi surface under an infinitesimal attractive interaction. Starting from the two-electron problem outside a filled Fermi sea, we analytically prove that an infinitesimal Hubbard attraction can lead to the Cooper instability as long as the density of the state is nonzero at the Fermi level. The findings provide a basis for the SC on the QC. Our numerical results show that the Cooper pairing always takes place between two time-reversal states, satisfying Anderson’s theorem. On this theorem, we perform a mean-field(MF) study at zero and finite temperatures. The MF study shows that an arbitrarily weak attraction can lead to a pairing order, with the resulting pairing state being well described by the Bardeen-Cooper-Schrieffer theory and the thermal dynamic behaviors being well consistent with the experimental results. The second issue is about the superfluid density on the QC without translational symmetry. Our findings clarify that although the normal state of the system locates at the critical point of the metal-insulator transition, the pairing state exhibits a real SC, carrying finite superfluid density that can be verified by the Meissner effect. This finding is consistent with the experiment results. This study also reveals that the properties of the SC on the Penrose lattice are universal for all QCs.

关键词： superconductivity quasicrystal cooper instability

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Enhanced Intertwined Spin and Charge Orders in the t–J Model in a Small J Case

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Chinese physics Letters 2023年第3期40卷 41-44页

作者：张渝梅佳伟陈伟强 department of physics and shenzhen Institute for quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China shenzhen key laboratory of advanced quantum functional materials and devices Southern University of Science and TechnologyShenzhen 518055China

The one-band t–J model captures strong correlations in cuprate high-temperature superconductors.It accounts for the various intertwined spin and charge orders,and the superconductivity in the phase diagrams.To see the correlation effect on the intertwined orders,we implement the density matrix renormalization group method to simulate the t–J model in a small J case with t/J=10,which is in a deeper Mott region than that with t/J?3 in cuprate superconducting compounds.We examine the results on a six-leg lattice with both the nearest and next-nearest-neighbor hoppings and antiferromagnetic coupling,and find the absence of superconductivity and enhanced intertwined spin and charge orders in the phase diagram.Besides the stripe phases,we find a new SDW+CDW phase in which the spin modulation is a(π,π)antiferromagnetism,while the wavelength of the charge modulation is shorter than that of the stripe phases.Our results suggest the enhanced intertwined orders and suppressed superconductivity in the deep Mott region.

关键词： compounds orders superconductivity

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Topological magnetoelectric response in ferromagnetic axion insulators

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National Science Review 2024年第2期11卷 8-14页

作者： Yuhao Wan Jiayu Li Qihang Liu department of physics and shenzhen Institute for quantum Science and Engineering(SIQSE) Southern University of Science and Technology shenzhen key laboratory of advanced quantum functional materials and devices Southern University of Science and Technology Guangdong Provincial key laboratory for Computational Science and Material Design Southern University of Science and Technology

The topological magnetoelectric effect (TME) is a hallmark response of the topological field theory,which provides a paradigm shift in the study of emergent topological phenomena.However,its direct observation is yet to be realized due to the demanding magnetic configuration required to gap all surface states.Here,we theoretically propose that axion insulators with a simple ferromagnetic configuration,such as the MnBi2Te4/(Bi2Te3)nfamily,provide an ideal playground to realize the TME.In the designed triangular prism geometry,all the surface states are magnetically gapped.Under a vertical electric field,the surface Hall currents give rise to a nearly half-quantized orbital moment,accompanied by a gapless chiral hinge mode circulating in parallel.Thus,the orbital magnetization from the two topological origins can be easily distinguished by reversing the electric field.Our work paves the way for direct observation of the TME in realistic axion-insulator materials.

关键词： topological magnetoelectric effect axion insulator magnetic topological materials

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Emergent symmetry in quantum phase transition:From deconfined quantum critical point to gapless quantum spin liquid

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Science Bulletin 2024年第2期69卷 190-196页

作者： Wen-Yuan Liu Shou-Shu Gong Wei-Qiang Chen Zheng-Cheng Gu department of physics The Chinese University of Hong KongHong KongChina Division of Chemistry and Chemical Engineering California Institute of TechnologyPasadena CA 91125USA School of Physical Sciences Great Bay UniversityDongguan 523000China Great Bay Institute for advanced Study Dongguan 523000China department of physics and shenzhen Institute for quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China shenzhen key laboratory of advanced quantum functional materials and devices Southern University of Science and TechnologyShenzhen 518055China

The emergence of exotic quantum phenomena in frustrated magnets is rapidly driving the development of quantum many-body physics,raising fundamental questions on the nature of quantum phase transitions.Here we unveil the behaviour of emergent symmetry involving two extraordinarily representative phenomena,i.e.,the deconfined quantum critical point(DQCP)and the quantum spin liquid(QSL)state.Via large-scale tensor network simulations,we study a spatially anisotropic spin-1/2 square-lattice frustrated antiferromagnetic(AFM)model,namely the J1x-J1y-J2 model,which contains anisotropic nearestneighbor couplings J1x,J1y and the next nearest neighbor coupling J2.For small J1y/J1x,by tuning J2,a direct continuous transition between the AFM and valence bond solid phase is observed.With growing J1y/J1x,a gapless QSL phase gradually emerges between the AFM and VBS phases.We observe an emergent O(4)symmetry along the AFM–VBS transition line,which is consistent with the prediction of DQCP theory.Most surprisingly,we find that such an emergent O(4)symmetry holds for the whole QSL–VBS transition line as well.These findings reveal the intrinsic relationship between the QSL and DQCP from categorical symmetry point of view,and strongly constrain the quantum field theory description of the QSL phase.The phase diagram and critical exponents presented in this paper are of direct relevance to future experiments on frustrated magnets and cold atom systems.

关键词： Tensor network quantum phase transition Emergent symmetry quantum spin liquid Deconfined quantum critical point Anisotropic

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一维有相互作用系统中拓扑相的分类与演生幺正性

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Science Bulletin 2021年第17期66卷 1731-1739,M0003页

作者：奚文杰张智浩顾正澄陈伟强 shenzhen key laboratory of advanced quantum functional materials and devices Southern University of Science and TechnologyShenzhen 518055China Institute for quantum Science and Engineering and department of physics Southern University of Science and TechnologyShenzhen 518055China School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China department of physics The Chinese Uinversity of Hong KongHong KongChina

近年来,非厄米系统中的拓扑相是一个重要的研究热点.本文尝试分类一维有相互作用非厄米系统中的拓扑相.首先,作者将SSH模型推广到了非厄米情形,并详细讨论该模型的拓扑多体贝里相位.在准厄米系统(能谱为实数的非厄米系统)中,多体贝里相... 详细信息

近年来,非厄米系统中的拓扑相是一个重要的研究热点.本文尝试分类一维有相互作用非厄米系统中的拓扑相.首先,作者将SSH模型推广到了非厄米情形,并详细讨论该模型的拓扑多体贝里相位.在准厄米系统(能谱为实数的非厄米系统)中,多体贝里相位是具备良好定义的.之后,该工作展示对于准厄米系统,其拓扑分类与厄米情况是相同的.最后,对于一般性的一维有相互作用非厄米系统,该工作构造了它们的不动点配分函数,并且发现这些不动点配分函数仍然与厄米系统的不动点配分函数有着一一对应.因此,可以得出结论,即对于一般性的一维有相互作用非厄米系统,其拓扑分类与厄米情况是相同的.

关键词：配分函数不动点相互作用系统 SSH模型贝里相位拓扑相拓扑分类一一对应

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无能隙量子自旋液体和正方晶格自旋1/2阻挫反铁磁模型的相图

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Science Bulletin 2022年第10期67卷 1034-1041,M0004页

作者：刘文渊龚寿书李毓彬 Didier Poilblanc 陈伟强顾正澄 department of physics The Chinese University of Hong KongHong KongChina department of physics Beihang UniversityBeijing 100191China Laboratoire de Physique Théorique C.N.R.S.and Universitéde ToulouseToulouse 31062France shenzhen key laboratory of advanced quantum functional materials and devices Southern University of Science and TechnologyShenzhen 518055China department of physics and Institute for quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International quantum Academy and Shenzhen BranchHefei National LaboratoryShenzhen 518040China

自高温超导发现以来,正方晶格上由自旋为1/2构成的包括近邻和次近邻海森堡相互作用的阻挫反铁磁模型,即J1±J2模型,因其基态被认为可以作为铜基超导的母态,在过去30多年中得到了广泛关注和深入研究.该模型包含的相互作用形式简单,如今... 详细信息

自高温超导发现以来,正方晶格上由自旋为1/2构成的包括近邻和次近邻海森堡相互作用的阻挫反铁磁模型,即J1±J2模型,因其基态被认为可以作为铜基超导的母态,在过去30多年中得到了广泛关注和深入研究.该模型包含的相互作用形式简单,如今也成为用来研究正方晶格上阻挫磁性的基本理论模型.但其基态性质仍然是一个悬而未决的问题.本文作者利用最近发展的二维张量网络态算法,对该模型进行了迄今为止精度最高的计算.详细的数值结果表明这个体系的基态包含了一个无能隙的量子自旋液体和价键固体态.他们进一步计算了相变的临界指数,提出了一个低能有效理论来描述这个量子自旋液体,并探讨了这个量子自旋液体与解禁闭量子临界性的关系.该工作通过仔细比较二维张量网络态和人们常用的密度矩阵重整化群两种算法的结果,提供了在正方晶格阻挫磁性体系的研究上第一个超越密度矩阵重整化方法的例子.他们也解释了以前研究结果矛盾之处的来源,为用二维张量网络态解决量子多体问题提供了一个范本.

关键词： quantum spin liquid Tensor network state Frustrated magnets Deconfined quantum critical point

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单层过渡金属硫族化合物中氧取代激活的光致发光增强

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Science China materials 2022年第4期65卷 1034-1041页

作者：赵仕龙谭隽阳柯丞轩冯思敏赖泳爵丁宝福罗光富林君浩刘碧录 shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen Institute and Institute of Materials ResearchTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China department of physics Southern University of Science and TechnologyShenzhen518055China department of materials Science and Engineering Southern University of Science and TechnologyShenzhen518055China Guangdong Provincial key laboratory of Computational Science and Material Design Southern University of Science and TechnologyShenzhen518055China shenzhen key laboratory of advanced quantum functional materials and devices Southern University of Science and TechnologyShenzhen518055China

具有原子层厚度的过渡金属硫族化合物(TMDCs)是一种适用于光子和光电子领域的新颖的半导体材料,而增强其光致发光(PL)特性对于这类材料的光学应用至关重要.尽管研究人员做了大量的工作来增强单层TMDCs的PL特性,但微观结构和PL效率之间... 详细信息

具有原子层厚度的过渡金属硫族化合物(TMDCs)是一种适用于光子和光电子领域的新颖的半导体材料,而增强其光致发光(PL)特性对于这类材料的光学应用至关重要.尽管研究人员做了大量的工作来增强单层TMDCs的PL特性,但微观结构和PL效率之间的复杂关系阻碍了对其性质的调控.本文中,我们证实了在激光辐照下,单层TMDC的PL强度在经过一个预激活的平台后可以增强近一个数量级且半峰宽变窄约20%.实验和理论研究表明,低功率的激光辐照能够在WS_(2)中产生许多硫空位簇,这些硫空位簇随后被氧取代并显著增强其PL.这种PL增强的现象在其他单层TMDC材料中有普适性,有利于TMDC在光学领域的应用.

关键词： two-dimensional materials transition metal dichalcogenides photoluminescence enhancement laser oxygen

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Nonlinear electronic and ultrafast optical signatures in chemical vapor-deposited ultrathin PtS_(2) ribbons

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Nano Research 2022年第5期15卷 4366-4373页

作者： Shaolong Jiang Jin Yang Liang Zhu Jiafeng Xie Weiteng Guo Erding Zhao Chaoyu Chen Tianwu Wang Fuhai Su Yanfeng Zhang Junhao Lin Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices and Department of Physics Southern University of Science and TechnologyShenzhen 518055China key laboratory of materials physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Great Bay Area Research Institute Aerospace Information Research Institute(AIR)of Chinese Academy of Science(CAS)Guangzhou 510700China shenzhen Institute for quantum Science and Engineering and department of physics Southern University of Science and TechnologyShenzhen 518055China International quantum Academy and Shenzhen BranchHefei National LaboratoryFutian DistrictShenzhen 518048China School of materials Science and Engineering Peking UniversityBeijing 100871China

The emerging two-dimensional(2D)platinum disulfide(PtS_(2))has driven increasing attentions due to its high electron mobility,good air-stability,and strong interlayer interaction which leads to a widely tunable electronic structure.However,a detailed study on its covalent-like layer-dependent properties remains infant.Herein,we demonstrate the successful production of ultrathin 1T-PtS_(2) ribbons with thickness centralized almost at monolayer 1L-4L and large domain size up to 210 μm on Au foils using chemical vapor deposition(CVD)technique,which enables macro-and microscopic study of its extraordinary layer-dependent features with precise control of the number of layers.Using electron energy loss spectroscopy(EELS)and optical pump-probe spectroscopy(OPPS),we reveal that both the electron and ultrafast optical absorption signals of the as-grown 2D PtS_(2) show strong nonlinear layer-dependent responses which manifest discriminated transition in 1L-4L PtS_(2) ribbons.The layer-dependent nonlinear response of 2D PtS_(2) can be well interpreted in the frame of calculated electron and phonon structures.These achievements offer a platform for successfully fabricating large-sized ultrathin 2D PtS_(2) and facilitating our knowledge about its electronic and optoelectronic properties.

关键词： platinum disulfide(PtS_(2)) chemical vapor deposition electronic transition saturable absorption optical pump-probe spectroscopy

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MatHub-2d:二维材料输运数据库及其高迁移率二维半导体材料高通量筛选应用

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Science China materials 2023年第7期66卷 2768-2776页

作者：姚明佳计嘉琳李鑫朱振宇葛军饴 David J.Singh 奚晋扬杨炯张文清 materials Genome Institute Shanghai UniversityShanghai 200444China State key laboratory of functional materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Zhejiang laboratory Hangzhou 311100China department of physics and Astronomy University of MissouriColumbiaMO 65211USA department of materials Science and Engineering and shenzhen Institute for quantum Science&Technology Southern University of Science and TechnologyShenzhen 518055China shenzhen Municipal key-Lab for advanced quantum materials and devices and Guangdong Provincial key Lab for Computational Science and materials Design Southern University of Science and TechnologyShenzhen 518055China

近些年来二维材料因其独特的物理化学性质引起了广泛关注.载流子迁移率是材料在电子设备应用中最重要的特性之一.在本文中,我们介绍了如何通过高通量计算筛选来发现高迁移率二维半导体材料.基于最近开发的MatHub-2d数据库(包含约1900个... 详细信息

近些年来二维材料因其独特的物理化学性质引起了广泛关注.载流子迁移率是材料在电子设备应用中最重要的特性之一.在本文中,我们介绍了如何通过高通量计算筛选来发现高迁移率二维半导体材料.基于最近开发的MatHub-2d数据库(包含约1900个二维材料的结构信息及其第一性原理计算结果),以带隙、磁性、弹性模量和形变势作为搜索标准,通过初步筛选,得到133个候选者.对这些体系,我们使用形变势方法和玻尔兹曼输运理论预测了迁移率.最终,我们预测19种二维材料在室温下(300 K)具有高迁移率(>10^(3)cm^(-2)V^(-1)s^(-1))和良好的稳定性.这些材料高迁移率的来源主要是较小的形变势常数、较大的弹性模量,以及较小的有效质量.其中有两种类型的化合物值得关注,BX(X=P,As,Sb)和ZO_(2)(Z=Ge,Sn,Pb),它们具有面内各向同性高迁移率.BX中“flower-like”化学键有利于p型和n型电输运,而Z-O反键态是ZO_(2)型二维材料良好电子传导的原因.除了这些二维材料,Si_(2)P_(2)、Ga_(2)O_(2)、Ge_(2)N_(2)等同样也表现出高的电子迁移率.这些高迁移率二维材料在新型半导体电子器件中具有潜在的应用前景.

关键词： two-dimensional materials high-throughput computational screening MatHub-2d mobility

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Total conversion of centimeter-scale nickel foam into single atom electrocatalysts with highly selective CO_(2)electrocatalytic reduction in neutral electrolyte

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Nano Research 2023年第2期16卷 2003-2010页

作者： Qikui Fan Pengfei Gao Shan Ren Yunteng Qu Chuncai Kong Jian Yang Yuen Wu Ministry of Education key laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an 710049China shenzhen key laboratory of Special functional materials Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Northwest Institute of Nuclear Technology Xi’an 710024China Institute of functional Nano&Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China State key laboratory of Photoelectric Technology and functional materials International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics and Photon-TechnologyNorthwest UniversityXi’an 710069China department of Chemistry iChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026China

To improve the atomic utilization of metals and reduce the cost of industrialization,the one-step total monoatomization of macroscopic bulk metals,as opposed to nanoscale metals,is effective.In this study,we used a thermal diffusion method to directly convert commercial centimeter-scale Ni foam to porous Ni single-atom-loaded carbon nanotubes(CNTs).As expected,owing to the coating of single-atom on porous,highly conductive CNT carriers,Ni single-atom electrocatalysts(Ni-SACs)exhibit extremely high activity and selectivity in CO_(2)electroreduction(CO_(2)RR),yielding a current density of>350 mA/cm^(2),a selectivity for CO of>91%under a flow cell configuration using a 1 M potassium chloride(KCl)electrolyte.Based on the superior activity of the Ni-SACs electrocatalyst,an integrated gas-phase electrochemical zero-gap reactor was introduced to generate a significant amount of CO current for potential practical applications.The overall current can be increased to 800 mA,while maintaining CO Faradaic efficiencies(FEs)at above 90%per unit cell.Our findings and insights on the active site transformation mechanism for macroscopic bulk Ni foam conversion into single atoms can inform the design of highly active single-atom catalysts used in industrial CO_(2)RR systems.

关键词： Ni single atom electrocatalyst CO_(2)electroreduction to CO neutral electrolyte thermal diffusion

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