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Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks

Jongjun M. Lee, Chenhua Geng, Jae Whan Park, Masaki Oshikawa, Sung-Sik Lee, Han Woong Yeom, and Gil Young Cho
Phys. Rev. Lett. 124, 137002 – Published 1 April 2020
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    Abstract

    We propose a new principle to realize flatbands which are robust in real materials, based on a network superstructure of one-dimensional segments. This mechanism is naturally realized in the nearly commensurate charge-density wave of 1T−TaS2 with the honeycomb network of conducting domain walls, and the resulting flatband can naturally explain the enhanced superconductivity. We also show that corner states, which are a hallmark of the higher-order topological insulators, appear in the network superstructure.

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    • Received 18 August 2019
    • Revised 8 November 2019
    • Accepted 6 March 2020

    DOI:https://doi.org/10.1103/PhysRevLett.124.137002

    Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

    © 2020 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Charge density wavesPhase diagramsSuperconducting order parameterSuperconducting phase transitionTopological insulators
    1. Physical Systems
    Low-temperature superconductorsUltrathin films
    1. Techniques
    Methods in superconductivity
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    Jongjun M. Lee1, Chenhua Geng2, Jae Whan Park3, Masaki Oshikawa2, Sung-Sik Lee4,5, Han Woong Yeom3,1, and Gil Young Cho1,*

    • 1Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
    • 2Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
    • 3Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea
    • 4Department of Physics & Astronomy, McMaster University, 1280 Main St. W., Hamilton Ontario L85 4M1, Canada
    • 5Perimeter Institute for Theoretical Physics, 31 Caroline ST. N., Waterloo Ontario N2L 2Y5, Canada

    • *gilyoungcho@postech.ac.kr

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    Vol. 124, Iss. 13 — 3 April 2020

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