We investigate hybrid structures based on a bilayer quantum spin Hall system
in proximity to an s-wave superconductor as a platform to mimic time-reversal
symmetric topological superconductors. In this bilayer setup, the induced
pairing can be of intra- or inter-layer type, and domain walls of those
different types of pairing potentials host Kramers partners (time-reversal
conjugate pairs) of Majorana bound states. Interestingly, we discover that such
topological interfaces providing Majorana bound states can also be achieved in
an otherwise homogeneous system by a spatially dependent inter-layer gate
voltage. This gate voltage causes the relative electron densities of the two
layers to vary accordingly which suppresses the inter-layer pairing in regions
with strong gate voltage. We identify particular transport signatures
(zero-bias anomalies) in a five-terminal setup that are uniquely related to the
presence of Kramers pairs of Majorana bound states.
Description
Phys. Rev. B 100, 165420 (2019) - Voltage-tunable Majorana bound states in time-reversal symmetric bilayer quantum spin Hall hybrid systems
%0 Journal Article
%1 PhysRevB.100.165420
%A Schulz, F.
%A Budich, J. C.
%A Novik, E. G.
%A Recher, P.
%A Trauzettel, B.
%D 2019
%I American Physical Society
%J Phys. Rev. B
%K a
%N 16
%P 165420
%R 10.1103/PhysRevB.100.165420
%T Voltage-tunable Majorana bound states in time-reversal symmetric bilayer quantum spin Hall hybrid systems
%U https://link.aps.org/doi/10.1103/PhysRevB.100.165420
%V 100
%X We investigate hybrid structures based on a bilayer quantum spin Hall system
in proximity to an s-wave superconductor as a platform to mimic time-reversal
symmetric topological superconductors. In this bilayer setup, the induced
pairing can be of intra- or inter-layer type, and domain walls of those
different types of pairing potentials host Kramers partners (time-reversal
conjugate pairs) of Majorana bound states. Interestingly, we discover that such
topological interfaces providing Majorana bound states can also be achieved in
an otherwise homogeneous system by a spatially dependent inter-layer gate
voltage. This gate voltage causes the relative electron densities of the two
layers to vary accordingly which suppresses the inter-layer pairing in regions
with strong gate voltage. We identify particular transport signatures
(zero-bias anomalies) in a five-terminal setup that are uniquely related to the
presence of Kramers pairs of Majorana bound states.
@article{PhysRevB.100.165420,
abstract = {We investigate hybrid structures based on a bilayer quantum spin Hall system
in proximity to an s-wave superconductor as a platform to mimic time-reversal
symmetric topological superconductors. In this bilayer setup, the induced
pairing can be of intra- or inter-layer type, and domain walls of those
different types of pairing potentials host Kramers partners (time-reversal
conjugate pairs) of Majorana bound states. Interestingly, we discover that such
topological interfaces providing Majorana bound states can also be achieved in
an otherwise homogeneous system by a spatially dependent inter-layer gate
voltage. This gate voltage causes the relative electron densities of the two
layers to vary accordingly which suppresses the inter-layer pairing in regions
with strong gate voltage. We identify particular transport signatures
(zero-bias anomalies) in a five-terminal setup that are uniquely related to the
presence of Kramers pairs of Majorana bound states.},
added-at = {2020-03-20T11:32:30.000+0100},
author = {Schulz, F. and Budich, J. C. and Novik, E. G. and Recher, P. and Trauzettel, B.},
biburl = {https://www.bibsonomy.org/bibtex/20ba675630f38a7ad5b56ef3269d47fbe/ctqmat},
day = 25,
description = {Phys. Rev. B 100, 165420 (2019) - Voltage-tunable Majorana bound states in time-reversal symmetric bilayer quantum spin Hall hybrid systems},
doi = {10.1103/PhysRevB.100.165420},
interhash = {62808e48e64ffe504f027fea6b7767b9},
intrahash = {0ba675630f38a7ad5b56ef3269d47fbe},
journal = {Phys. Rev. B},
keywords = {a},
month = {10},
note = {cite arxiv:1904.07166},
number = 16,
numpages = {12},
pages = 165420,
publisher = {American Physical Society},
timestamp = {2023-01-16T14:49:29.000+0100},
title = {Voltage-tunable Majorana bound states in time-reversal symmetric bilayer quantum spin Hall hybrid systems},
url = {https://link.aps.org/doi/10.1103/PhysRevB.100.165420},
volume = 100,
year = 2019
}