Nonreciprocal charge transport at topological insulator/superconductor interface

Kenji Yasuda (), Hironori Yasuda, Tian Liang, Ryutaro Yoshimi, Atsushi Tsukazaki, Kei S. Takahashi, Naoto Nagaosa, Masashi Kawasaki and Yoshinori Tokura
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Kenji Yasuda: University of Tokyo
Hironori Yasuda: University of Tokyo
Tian Liang: RIKEN Center for Emergent Matter Science (CEMS)
Ryutaro Yoshimi: RIKEN Center for Emergent Matter Science (CEMS)
Atsushi Tsukazaki: Tohoku University
Kei S. Takahashi: RIKEN Center for Emergent Matter Science (CEMS)
Naoto Nagaosa: University of Tokyo
Masashi Kawasaki: University of Tokyo
Yoshinori Tokura: University of Tokyo

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract Topological superconductor is attracting growing interest for its potential application to topological quantum computation. The superconducting proximity effect on the topological insulator surface state is one promising way to yield topological superconductivity. The superconductivity realized at the interface between Bi2Te3 and non-superconductor FeTe is one such candidate. Here, to detect the mutual interaction between superconductivity and topological surface state, we investigate nonreciprocal transport; i.e., current-direction dependent resistance, which is sensitive to the broken inversion symmetry of the electronic state. The largely enhanced nonreciprocal phenomenon is detected in the Bi2Te3/FeTe heterostructure associated with the superconducting transition. The emergent nonreciprocal signal at low magnetic fields is attributed to the current-induced modulation of supercurrent density under the in-plane magnetic fields due to the spin-momentum locking. The angular dependence of the signal reveals the symmetry of superconductivity and indicates the existence of another mechanism of nonreciprocal transport at high fields.

Date: 2019
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DOI: 10.1038/s41467-019-10658-3

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