Transport signatures of interacting fermions in quasi-one-dimensional topological superconductors

Meidan, Dganit and Romito, Alessandro and Brouwer, Piet W. (2016) Transport signatures of interacting fermions in quasi-one-dimensional topological superconductors. Physical review B, 93 (12): 125433. ISSN 2469-9950

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Abstract

A topological superconducting wire with an effective time reversal symmetry is known to have a $\mathbb{Z}_8$ topological classification in the presence of interactions. The topological index $|n| \le 4$ counts the number of Majorana end states, negative $n$ corresponding to end states that are odd under time reversal. If such a wire is weakly coupled to a normal-metal lead, interactions induce a Kondo-like correlated state if $|n| = 4$. We show that the Kondo-like state manifests itself in an anomalous temperature dependence of the zero-bias conductance and by an anomalous Fano factor for the zero-temperature normally-reflected current at finite bias. We also consider the splitting of the effective Kondo resonance for weak symmetry-breaking perturbations.