In situ tuning of symmetry-breaking induced non-reciprocity in giant-Rashba semiconductor BiTeBr

17 Aug 2020  ·  Kocsis Mátyás, Zheliuk Oleksandr, Makk Péter, Tóvári Endre, Kun Péter, Tereshchenko Oleg Evgenevich, Kokh Konstantin Aleksandrovich, Taniguchi Takashi, Watanabe Kenji, Ye Justin, Csonka Szabolcs ·

Non-reciprocal transport, where the left to right flowing current differs from the right to left flowing one, is an unexpected phenomenon in bulk crystals. BiTeBr is a non-centrosymmetric material, with a giant Rashba spin-orbit coupling which presents this unusual effect when placed in an in-plane magnetic field... It has been shown that this effect depends strongly on the carrier density, however, in-situ tuning has not yet been demonstrated. We developed a method where thin BiTeBr flakes are gate tuned via ionic-liquid gating through a thin protective hBN layer. Tuning the carrier density allows a more than \SI{400}{\percent} variation of the non-reciprocal response. Our study serves as a milestone on how a few-atomic-layer-thin van der Waals protection layer allows ionic gating of chemically sensitive, exotic nanocrystals. read more

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Mesoscale and Nanoscale Physics