Edge-mode Superconductivity in a Two Dimensional Topological Insulator
arXiv:1408.1701 · doi:10.1038/nnano.2015.86
Abstract
Topological superconductivity is an exotic state of matter that supports Majorana zero-modes, which are surface modes in 3D, edge modes in 2D or localized end states in 1D. In the case of complete localization these Majorana modes obey non-Abelian exchange statistics making them interesting building blocks for topological quantum computing. Here we report superconductivity induced into the edge modes of semiconducting InAs/GaSb quantum wells, a two-dimensional topological insulator. Using superconducting quantum interference, we demonstrate gate-tuning between edge-dominated and bulk-dominated regimes of superconducting transport. The edge-dominated regime arises only under conditions of high-bulk resistivity, which we associate with the 2D topological phase. These experiments establish InAs/GaSb as a robust platform for further confinement of Majoranas into localized states enabling future investigations of non-Abelian statistics.
19 pages, 17 figures
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- A road to reality with topological superconductors
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- Conventional Superconductivity in Type II Dirac Semimetal PdTe
- Reducing electronic transport dimension to topological hinge states by increasing geometry size of Dirac semimetal Josephson junctions
- High efficiency thermal switch based on topological Josephson junctions
- Edge transport in InAs and InAs/GaSb quantum wells
- superconducting quantum interference through trivial edge states in InAs
- Detecting topological superconductivity using low-frequency doubled Shapiro steps
- Single-edge transport in an InAs/GaSb quantum spin Hall insulator
- Engineering quantum spin Hall insulators by strained-layer heterostructures
- Multiple odd-frequency superconducting states in buckled quantum spin Hall insulators with time-reversal symmetry
- Magnitude and Spatial Distribution Control of the Supercurrent in Bi2O2Se-Based Josephson Junction
- Proximity-induced superconductivity within the InAs/GaSb edge conducting state
- Counterflowing edge current and its equilibration in quantum Hall devices with sharp edge potential: Roles of incompressible strips and contact configuration
- Identify the topological superconducting order in a multi-band quantum wire
- Majorana fermions on the quantum Hall edge
- Revealing intrinsic superconductivity of the Nb/BiSbTeSe interface
- Edge absorption and pure spin current in 2D topological insulator in the Volkov-Pankratov model
- Critical Current Anomaly at the Topological Quantum Phase Transition in a Majorana Josephson Junction
- Effects of the Spatial Extension of the Edge Channels on the Interference Pattern of a Helical Josephson Junction
- Theory and optimisation of radiative recombination in broken-gap InAs/GaSb superlattices
- Fabry-Pérot interference in 2D low-density Rashba gas
- Interaction effects in superconductor/quantum spin Hall devices: universal transport signatures and fractional Coulomb blockade
- Many-body Majorana-like zero modes without gauge symmetry breaking
- Magnetotransport properties of the Quantum Spin Hall and Quantum Hall states in an inverted HgTe/CdTe and InAs/GaSb quantum wells
- Anomalous magnetic interference of cross-type Josephson junctions exposed to oblique magnetic fields