Kavli Affiliate: Srijit Goswami
| First 5 Authors: Christian M. Moehle, Prasanna K. Rout, Nayan A. Jainandunsing, Dibyendu Kuiri, Chung Ting Ke
| Summary:
Tunneling spectroscopy measurements are often used to probe the energy
spectrum of Andreev bound states (ABSs) in semiconductor-superconductor
hybrids. Recently, this spectroscopy technique has been incorporated into
planar Josephson junctions (JJs) formed in two-dimensional electron gases, a
potential platform to engineer phase-controlled topological superconductivity.
Here, we perform ABS spectroscopy at the two ends of planar JJs and study the
effects of the magnetic vector potential on the ABS spectrum. We show that the
local superconducting phase difference arising from the vector potential is
equal in magnitude and opposite in sign at the two ends, in agreement with a
model that assumes localized ABSs near the tunnel barriers. Complemented with
microscopic simulations, our experiments demonstrate that the local phase
difference can be used to estimate the relative position of localized ABSs
separated by a few hundred nanometers.
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