Tunable vortex bound states in multiband CsV3Sb5-derived kagome superconductors

Zihao Huang ¹Xianghe Han ¹Zhen Zhao ¹Jinjin Liu ²Pengfei Li ³Hengxin Tan ⁴Zhiwei Wang ²Yugui Yao ²Haitao Yang ⁵Binghai Yan ⁴Kun Jiang ³Jiangping Hu ³Ziqiang Wang ⁶Hui Chen ⁵Hong-Jun Gao⁵

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作者信息

1. Beijing National Center for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China
2. Centre for Quantum Physics,Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE),School of Physics,Beijing Institute of Technology,Beijing 100081,China;Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems,Beijing Institute of Technology,Beijing 100081,China
3. Beijing National Center for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
4. Department of Condensed Matter Physics,Weizmann Institute of Science,Rehovot 7610001,Israel
5. Beijing National Center for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Hefei National Laboratory,Hefei 230088,China
6. Department of Physics,Boston College,Chestnut Hill MA 02467,USA
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Abstract

Vortices and bound states offer an effective means of comprehending the electronic properties of super-conductors.Recently,surface-dependent vortex core states have been observed in the newly discovered kagome superconductors CsV3Sb5.Although the spatial distribution of the sharp zero energy conductance peak appears similar to Majorana bound states arising from the superconducting Dirac surface states,its origin remains elusive.In this study,we present observations of tunable vortex bound states(VBSs)in two chemically-doped kagome superconductors Cs(V1-xTrx)3Sb5(Tr=Ta or Ti),using low-temperature scanning tunneling microscopy/spectroscopy.The CsV3Sb5-derived kagome superconductors exhibit full-gap-pairing superconductivity accompanied by the absence of long-range charge orders,in contrast to pristine CsV3Sb5.Zero-energy conductance maps demonstrate a field-driven continuous reorientation transition of the vortex lattice,suggesting multiband superconductivity.The Ta-doped CsV3Sb5 displays the conventional cross-shaped spatial evolution of Caroli-de Gennes-Matricon bound states,while theTi-doped CsV3Sb5 exhibits a sharp,non-split zero-bias conductance peak(ZBCP)that persists over a long dis-tance across the vortex.The spatial evolution of the non-split ZBCP is robust against surface effects and external magnetic field but is related to the doping concentrations.Our study reveals the tunable VBSs in multiband chemically-doped CsV3Sb5 system and offers fresh insights into previously reported Y-shaped ZBCP in a non-quantum-limit condition at the surface of kagome superconductor.

Key words

Kagome superconductor/Chemical doping/Vortex lattice transition/Vortex bound states/Majorana bound states

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基金项目

National Natural Science Foundation of China(61888102)

National Natural Science Foundation of China(52022105)

National Natural Science Foundation of China(92065109)

National Natural Science Foundation of China(12174428)

National Key Research and Development Projects of China(2022YFA1204100)

National Key Research and Development Projects of China(2018YFA0305800)

National Key Research and Development Projects of China(2019YFA0308500)

National Key Research and Development Projects of China(2020YFA0308800)

National Key Research and Development Projects of China(2022YFA1403400)

CAS Project for Young Scientists in Basic Research(YSBR-003)

CAS Project for Young Scientists in Basic Research(2022YSBR-048)

Innovation Program of Quantum Science and Technology(2021ZD0302700)

European Research Council(815869)

ISF-Singapore-Israel Research Grant(3520/20)

US DOE,Basic Energy Sciences(DE-FG02-99ER45747)

出版年

2024

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

参考文献量2

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