Proximity effect in a two-dimensional electron gas coupled to a thin superconducting layer

Abstract

There have recently been several experiments studying induced superconductivity in semiconducting two-dimensional electron gases that are strongly coupled to thin superconducting layers, as well as probing possible topological phases supporting Majorana bound states in such setups. We show that a large band shift is induced in the semiconductor by the superconductor in this geometry, thus making it challenging to realize a topological phase. Additionally, we show that while increasing the thickness of the superconducting layer reduces the magnitude of the band shift, it also leads to a more significant renormalization of the semiconducting material parameters and does not reduce the challenge of tuning into a topological phase.

Appearing in Beilstein Journal of Nanotechnology thematic series on "Topological Materials"

References in corpus (21)

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Cited by in corpus (22)

• InAs-Al Hybrid Devices Passing the Topological Gap Protocol
• Majorana Kramers pairs in higher-order topological insulators
• Second Order Topological Superconductivity in $\pi$-Junction Rashba Layers
• Zero-energy Andreev bound states from quantum dots in proximitized Rashba nanowires
• Supercurrent detection of topologically trivial zero-energy states in nanowire junctions
• Local and non-local quantum transport due to Andreev bound states in finite Rashba nanowires with superconducting and normal sections
• Floquet Second-Order Topological Superconductor Driven via Ferromagnetic Resonance
• Enhanced topological superconductivity in spatially modulated planar Josephson junctions
• Lifetime of Majorana qubits in Rashba nanowires with non-uniform chemical potential
• Detecting induced $p\pm ip$ pairing at the Al-InAs interface with a quantum microwave circuit
• Majorana Bound States in Double Nanowires with Reduced Zeeman Thresholds due to Supercurrents
• Pinning of Andreev bound states to zero energy in two-dimensional superconductor-semiconductor Rashba heterostructures
• Planar Josephson junctions in germanium: Effect of cubic spin-orbit interaction
• Enhanced orbital magnetic field effects in Ge hole nanowires
• Control over epitaxy and the role of the InAs/Al interface in hybrid two-dimensional electron gas systems
• Majorana bound states in germanium Josephson junctions via phase control
• Superconducting Quantum Interference in Edge State Josephson Junctions
• Robust topological superconductivity in weakly coupled nanowire-superconductor hybrid structures
• Time-Reversal Invariant Topological Superconductivity in Planar Josephson Bijunction
• Majorana bound states in topological insulators with hidden Dirac points
• InP/GaSb core-shell nanowires: a novel hole-based platform with strong spin-orbit coupling for full-shell hybrid devices
• Proximity Effect in Superconducting Heterostructures with Strong Spin-Orbit Coupling and Spin Splitting