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Evidence for Majorana phases in the magnetoconductance of topological junctions based on two-dimensional electron gases

AuthorsSerra, Llorenç ; Delfanazari, Kaveh
Issue Date15-Mar-2020
PublisherAmerican Physical Society
CitationPhysical Review B 101(11): 115409 (2020)
AbstractWe calculate the linear conductance of a two-dimensional electron-gas-based junction between a normal semiconductor section and a hybrid semiconductor-superconductor section, under perpendicular magnetic field. We consider two important terms often neglected in the literature, the magneto-orbital and transverse Rashba spin-orbit. The strong orbital effect due to the magnetic field yields topological phase transitions to nontrivial phases hosting Majorana modes in the hybrid section. The presence of a potential barrier at the junction interface reveals the Majorana phases as quantized plateaus of high conductance, for low values of the chemical potential. In wide junctions (or large chemical potentials) the phase transitions occur at low magnetic fields but the magneto-conductance becomes anomalous and lacks clearly quantized plateaus.
Publisher version (URL)http://doi.org/10.1103/PhysRevB.101.115409
Identifiersdoi: 10.1103/PhysRevB.101.115409
issn: 2469-9950
e-issn: 2469-9969
Appears in Collections:(IFISC) Artículos
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