Surface-termination-dependent electronic states in kagome superconductors ${A\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ $(A=\mathrm{K}, \mathrm{Rb}, \mathrm{Cs})$ studied by micro-ARPES

Surface-termination-dependent electronic states in kagome superconductors ${A V}_{3} {Sb}_{5}$ $(A = K, Rb, Cs)$ studied by micro-ARPES

Takemi Kato, Yongkai Li, Min Liu, Kosuke Nakayama, Zhiwei Wang, Seigo Souma, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yugui Yao, and Takafumi Sato

Phys. Rev. B 107, 245143 – Published 29 June 2023

Abstract

Recently discovered kagome superconductors $A V_{3} {Sb}_{5}$ $(A = K, Rb, Cs)$ exhibit exotic bulk and surface physical properties such as charge density wave (CDW) and chirality, whereas their origins remain unresolved. By using microfocused angle-resolved photoemission spectroscopy, we discovered that $A V_{3} {Sb}_{5}$ commonly exhibits two distinct polar surfaces depending on the termination: electron- and hole-doped ones for the $A$ and Sb termination, respectively. We observed that the kagome-derived band shows a splitting in the $A$ -terminated surface, while it is absent in the Sb-terminated counterpart, suggestive of a signature of the polarity-dependent CDW at the surface. Close comparison of the band-dependent splitting implies that the three-dimensional CDW structure of the K-terminated surface is different from that of the Rb- or Cs-terminated surface, suggesting the possible diversity of the CDW ground state. These results provide important insight into the origin of CDW in kagome superconductors $A V_{3} {Sb}_{5}$ .

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Received 27 January 2023
Revised 29 May 2023
Accepted 8 June 2023

DOI:https://doi.org/10.1103/PhysRevB.107.245143

Physics Subject Headings (PhySH)

Charge density waves Electric polarization Electronic structure Surface & interfacial phenomena

Kagome lattice Superconductors

Angle-resolved photoemission spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Takemi Kato ^1,*, Yongkai Li^2,3,4,*, Min Liu^2,3,5,*, Kosuke Nakayama ^1,6,†, Zhiwei Wang ^2,3,4,‡, Seigo Souma ^7,8, Miho Kitamura⁹, Koji Horiba ^9,10, Hiroshi Kumigashira ¹¹, Takashi Takahashi¹, Yugui Yao ^2,3, and Takafumi Sato ^{1,7,8,12,13,§}

¹Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
²Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, People's Republic of China
³Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, Beijing Institute of Technology, Beijing 100081, People's Republic of China
⁴Material Science Center, Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314011, People's Republic of China
⁵College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
⁶Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Tokyo 102-0076, Japan
⁷Center for Science and Innovation in Spintronics (CSIS), Tohoku University, Sendai 980-8577, Japan
⁸Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
⁹Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
¹⁰National Institutes for Quantum Science and Technology (QST), Sendai 980-8579, Japan
¹¹Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan
¹²International Center for Synchrotron Radiation Innovation Smart (SRIS), Tohoku University, Sendai 980-8577, Japan
¹³Mathematical Science Center for Co-creative Society (MathCCS), Tohoku University, Sendai 980-8578, Japan

^*These authors contributed equally to this work.
^†Corresponding author: k.nakayama@arpes.phys.tohoku.ac.jp
^‡Corresponding author: zhiweiwang@bit.edu.cn
^§Corresponding author: t-sato@arpes.phys.tohoku.ac.jp

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Vol. 107, Iss. 24 — 15 June 2023

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Physical Review B

covering condensed matter and materials physics

Surface-termination-dependent electronic states in kagome superconductors ${A V}_{3} {Sb}_{5}$ $(A = K, Rb, Cs)$ studied by micro-ARPES

Takemi Kato, Yongkai Li, Min Liu, Kosuke Nakayama, Zhiwei Wang, Seigo Souma, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yugui Yao, and Takafumi Sato

Phys. Rev. B 107, 245143 – Published 29 June 2023

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Surface-termination-dependent electronic states in kagome superconductors AV3Sb5 (A=K, Rb, Cs) studied by micro-ARPES

Takemi Kato, Yongkai Li, Min Liu, Kosuke Nakayama, Zhiwei Wang, Seigo Souma, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Takashi Takahashi, Yugui Yao, and Takafumi Sato

Phys. Rev. B 107, 245143 – Published 29 June 2023

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Surface-termination-dependent electronic states in kagome superconductors ${A V}_{3} {Sb}_{5}$ $(A = K, Rb, Cs)$ studied by micro-ARPES