Majorana fermion chain at the Quantum Spin Hall edge

Details Majorana fermion chain at the Quantum Spin Hall edge Majorana fermion chain at the Quantum Spin Hall edge

2010-04-26

arxiv.org/abs/1004.4585v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

We study a realization of a 1d chain of Majorana bound states at the interfaces between alternating ferromagnetic and superconducting regions at a quantum spin Hall insulator edge. In the limit of well separated Majoranas, the system can be mapped to the transverse field Ising model. The disordered critical point can be reached by tuning the relative magnitude or phases of the ferromagnetic and superconducting order parameters. We compute the voltage dependence of the tunneling current from a metallic tip into the Majorana chain as a direct probe of the random critical state.

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