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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Yasuda K,Yasuda H,Liang T,Yoshimi R,Tsukazaki A,Takahashi KS,Nagaosa N,Kawasaki M,Tokura Ydoi
10.1038/s41467-019-10658-3subject
Has Abstractpub_date
2019-06-21 00:00:00pages
2734issue
1issn
2041-1723pii
10.1038/s41467-019-10658-3journal_volume
10pub_type
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