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您的检索式：作者名="M.Zahid Hasan"
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| 1 | Kagome superconductors AV_(3)Sb_(5)(A=K,Rb,Cs)显示文摘The quasi-two-dimensional kagome materials AV_(3)Sb_(5)(A=K,Rb,Cs)were found to be a prime example of kagome superconductors,a new quantum platform to investigate the interplay between electron correlation effects,topology and geometric frustration.In this review,we report recent progress on the experimental and theoretical studies of AV_(3)Sb_(5)and provide a broad picture of this fast-developing field in order to stimulate an expanded search for unconventional kagome superconductors.We review the electronic properties of AV_(3)Sb_(5),the experimental measurements of the charge density wave state,evidence of time-reversal symmetry breaking and other potential hidden symmetry breaking in these materials.A variety of theoretical proposals and models that address the nature of the time-reversal symmetry breaking are discussed.Finally,we review the superconducting properties of AV_(3)Sb_(5),especially the potential pairing symmetries and the interplay between superconductivity and the charge density wave state. | Kun Jiang Tao Wu Jia-Xin Yin Zhenyu Wang M.Zahid Hasan Stephen D.Wilson Xianhui Chen Jiangping Hu | 2023 | National Science Review2023，10，2： | 1 |
| 2 | 量子自旋霍尔绝缘体Bi_(4)Br_(4)体与边缘的可区分的光学性质研究显示文摘量子自旋霍尔绝缘体拥有具有带隙的体态和无能隙的一维拓扑边缘态.然而,由于拓扑边缘态局域在纳米尺度,所以很难用光学手段直接观测并区分体态和边缘态,这就限制了对拓扑边缘态独特的光学特性和光电响应等方面的研究和应用.Bi_(4)Br_(4)体材料的台阶存在一维非平庸的边缘态,多个台阶累加的效应使得通过较为宏观的光学和光电分析手段来研究一维边缘态成为可能.该工作利用中远红外显微吸收光谱和泵浦探测光谱,对比研究了Bi_(4)Br_(4)体和边缘的光学响应行为.研究发现Bi_(4)Br_(4)的边缘在小于带隙(约0.22 eV)的波段存在明显的强于体内的红外吸收,且该吸收呈现较强的各向异性.室温下的红外泵浦探测首次观察到边缘处载流子激发态超长的弛豫时间(1.5 ns),该激发态载流子寿命要比体内载流子寿命长两个量级.该工作证实体态和拓扑边缘态具有明显不同的光学和光电响应行为,为未来设计新型红外探测器提供了材料和物理基础. | 韩俊峰 毛鹏程 陈海龙 殷嘉鑫 王茂原 陈东云 李永恺 郑靖川 张旭 马大帅 马琼 余智明 周金健 刘铖铖 王业亮 贾爽 翁羽翔 M.Zahid Hasan 肖文德 姚裕贵 | 2023 | Science Bulletin2023，68，4： | 0 |
| 3 | Theory for Charge Density Wave and Orbital-Flux State in Antiferromagnetic Kagome Metal FeGe显示文摘We theoretically study the charge order and orbital magnetic properties of a new type of antiferromagnetic kagome metal FeGe.Based on first-principles density functional theory calculations,we study the electronic structures,Fermi-surface quantum fluctuations,as well as phonon properties of the antiferromagnetic kagome metal FeGe.It is found that charge density wave emerges in such a system due to a subtle cooperation between electron-electron interactions and electron–phonon couplings,which gives rise to an unusual scenario of interaction-triggered phonon instabilities,and eventually yields a charge density wave(CDW)state.We further show that,in the CDW phase,the ground-state current density distribution exhibits an intriguing star-of-David pattern,leading to flux density modulation.The orbital fluxes(or current loops)in this system emerge as a result of the subtle interplay between magnetism,lattice geometries,charge order,and spin-orbit coupling(SOC),which can be described by a simple,yet universal,tight-binding theory including a Kane-Mele-type SOC term and a magnetic exchange interaction.We further study the origin of the peculiar step-edge states in FeGe,which sheds light on the topological properties and correlation effects in this new type of kagome antiferromagnetic material. | 马海洋 殷嘉鑫 M.Zahid Hasan 刘健鹏 | 2024 | Chinese Physics Letters2024，41，4： | 0 |
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