Research

Nonreciprocal transport in a Bi₂Te₃/FeTe heterostructure. 

The illustration of a Bi₂Te₃/FeTe heterostructure (Bi₂Te₃: blue, FeTe: green). The interface of Bi₂Te₃ and FeTe shows superconductivity (yellow region). The nonreciprocal transport is measured with current I along x-direction under the in-plane magnetic field B (along y-direction) perpendicular to the current. The mutual interaction between spin–momentum-locked topological surface state and superconductivity (as represented by Δ_SC) is expected at the interface as expressed in momentum space in the right circle. σ represents the spin direction of the electron.