Straining the Identity of Majorana Fermions

Abstract

We propose an experimental setup of an interferometer for the observation of neutral Majorana fermions on topological insulator - superconductor - ferromagnet junctions. We show that the extended lattice defects naturally present in materials, dislocations, induce spin currents on the edges while keeping the bulk time-reversal symmetry intact. We propose a simple two terminal conductance measurement in an interferometer formed by two edge point contacts, which reveals the nature of Majorana states through the effect of dislocations. The zero temperature magneto-conductance changes from even oscillations with period phi/2 (phi is the flux quantum hc/e) to odd oscillations with period phi, when non-trivial dislocations are present and the Majorana states are sufficiently strongly coupled. Additionally, the conductance acquires a notable asymmetry as a function of the incident electron energy, due to the topological influence of the dislocations, while resonances appear at the coupling energy of Majorana states.

5 pages, 3 figures, three-point bending setup with Hg(Cd)Te analyzed

References in corpus (14)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Topological Insulators with Inversion Symmetry
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Topological Field Theory of Time-Reversal Invariant Insulators
• Nonlocal edge state transport in the quantum spin Hall state
• Quantum Spin Hall Effect and Enhanced Magnetic Response by Spin-Orbit Coupling
• Helical Metal Inside a Topological Band Insulator
• Observing Majorana Bound States in p-wave Superconductors Using Noise Measurements in Tunneling Experiments
• Helical edge and surface states in HgTe quantum wells and bulk insulators
• Corner Junction as a Probe of Helical Edge States
• Testable signatures of quantum non-locality in a two-dimensional chiral p-wave superconductor

Cited by in corpus (2)

• Probing Majorana Bound States via Thermoelectric Transport
• Majorana Thermoelectrics and Refrigeration