Physics Chat
Proximity-induced superconductivity in InSb 2DEG Heterostructures
Speaker: Tom Robinson (Sean Giblin's group)
Date: Thursday 3 November 2022
Time: 14:00
Venue: Queen's building WX3.07 with zoom live streaming
The superconducting state induced via the proximity effect in high spin orbit coupling semiconductor two dimensional electron gases (2DEGs) is thought to exhibit signatures of both spin singlet and spin triplet superconducting pairing. Long ballistic lengths in 2DEGs has been experimentally shown to extend the induced superconducting state over several microns [1]. Additionally, manipulation of such a state is of great interest in exploring topological superconductivity [2]. However, much work is needed to experimentally confirm, characterise and controllably manipulate the induced superconducting state. This talk will focus on two different experimental approaches to this using high mobility InSb 2DEGs. The first will consider the fabrication, characterisation and subsequent electrical measurements of a series of spatially gapped Nb/InSb devices on the order of a few microns. The second will discuss recent attempts to directly measure the induced superconducting state via Low Energy Muon Spectroscopy measurements performed on a Pb/InSb sample.
References:
1 https://doi.org/10.1038/s41467-019-11742-4.
2 DOI: 10.1103/PhysRevB.81.125318