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

Serra, L. and Delfanazari, K. (2020) Evidence for Majorana phases in the magnetoconductance of topological junctions based on two-dimensional electron gases. Physical Review B, 101, 115409. (doi: 10.1103/PhysRevB.101.115409)

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Abstract

We 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.

Item Type:Articles
Additional Information:We acknowledge support from MINECO (Spain) Grant No. MAT2017-82639, MINECO/AEI/FEDER María de Maeztu Program for Units of Excellence MDM2017-0711, and from EPSRC (UK) for MQIC Grant No. EP/S019324/1.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Delfanazari, Dr Kaveh
Authors: Serra, L., and Delfanazari, K.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:2469-9950
ISSN (Online):2469-9969
Copyright Holders:Copyright © 2020 American Physical Society
First Published:First published in Physical Review B 101:115409
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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