首页|Tunable vortex bound states in multiband CsV3Sb5-derived kagome superconductors

Tunable vortex bound states in multiband CsV3Sb5-derived kagome superconductors

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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.

Kagome superconductorChemical dopingVortex lattice transitionVortex bound statesMajorana bound states

Zihao Huang、Xianghe Han、Zhen Zhao、Jinjin Liu、Pengfei Li、Hengxin Tan、Zhiwei Wang、Yugui Yao、Haitao Yang、Binghai Yan、Kun Jiang、Jiangping Hu、Ziqiang Wang、Hui Chen、Hong-Jun Gao

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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

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

Department of Condensed Matter Physics,Weizmann Institute of Science,Rehovot 7610001,Israel

Hefei National Laboratory,Hefei 230088,China

Department of Physics,Boston College,Chestnut Hill MA 02467,USA

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Projects of ChinaNational Key Research and Development Projects of ChinaNational Key Research and Development Projects of ChinaNational Key Research and Development Projects of ChinaNational Key Research and Development Projects of ChinaCAS Project for Young Scientists in Basic ResearchCAS Project for Young Scientists in Basic ResearchInnovation Program of Quantum Science and TechnologyEuropean Research CouncilISF-Singapore-Israel Research GrantUS DOE,Basic Energy Sciences

618881025202210592065109121744282022YFA12041002018YFA03058002019YFA03085002020YFA03088002022YFA1403400YSBR-0032022YSBR-0482021ZD03027008158693520/20DE-FG02-99ER45747

2024

10.1016/j.scib.2024.01.036

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(7)
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