Correlation-driven organic 3D topological insulator with relativistic fermions

Tetsuya Nomoto (), Shusaku Imajo, Hiroki Akutsu, Yasuhiro Nakazawa and Yoshimitsu Kohama
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Tetsuya Nomoto: the University of Tokyo
Shusaku Imajo: the University of Tokyo
Hiroki Akutsu: Osaka University
Yasuhiro Nakazawa: Osaka University
Yoshimitsu Kohama: the University of Tokyo

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Exploring new topological phenomena and functionalities induced by strong electron correlation has been a central issue in modern condensed-matter physics. One example is a topological insulator (TI) state and its functionality driven by the Coulomb repulsion rather than a spin-orbit coupling. Here, we report a ‘correlation-driven’ TI state realized in an organic zero-gap system α-(BETS)2I3. The topological surface state and chiral anomaly are observed in temperature and field dependences of resistance, indicating a three-dimensional TI state at low temperatures. Moreover, we observe a topological phase switching between the TI state and non-equilibrium Dirac semimetal state by a dc current, which is a unique functionality of a correlation-driven TI state. Our findings demonstrate that correlation-driven TIs are promising candidates not only for practical electronic devices but also as a field for discovering new topological phenomena and phases.

Date: 2023
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DOI: 10.1038/s41467-023-37293-3

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