The Charge Transport in Minimal Kitaev Chain

The quantum transport is investigated in minimal Kitaev chain coupled to normal metal leads. The exact formulas of the charge current I and the conductance G are exhibited using the nonequilibrium Greens function approach. For simplify, the cases of asymmetric and symmetric bias voltage, the charge current, and the conductance G are presented at zero temperature. For asymmetric bias, due to the crossed Andreev reflection, the current and conductance are asymmetric. However, there is not crossed Andreev reflection in the case of symmetrically applied bias voltage. The current and conductance are symmetric about bias voltage eV = 0. In both cases, as the system's parameters ε L , ε R , and t , Δ satisfy the relation ε L ε R = t 2 −Δ 2 , there are zero‐bias peaks, which is known as poor man's Majoranas. A zero magnitude of nonlocal conductance Δ G NL , along with a flip in the sign of Δ G NL , is observed. The gap of Δ G NL must close and reopen, signaling a topological phase transition.