Correlation-driven organic 3D topological insulator with relativistic fermions
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 -(BETS)I. The surface metallic state that emerges at low temperatures exhibits characteristic transport properties of a gapless Dirac semimetal, evidencing the presence of a topological surface state in this compound. 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.
Cite
@article{arxiv.2208.00631,
title = {Correlation-driven organic 3D topological insulator with relativistic fermions},
author = {Tetsuya Nomoto and Shusaku Imajo and Hiroki Akutsu and Yasuhiro Nakazawa and Yoshimitsu Kohama},
journal= {arXiv preprint arXiv:2208.00631},
year = {2023}
}
Comments
36 pages including 10 figures