Controlling Andreev Bound States with the Magnetic Vector Potential
Christian M. Moehle (TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab, Kavli institute of nanoscience Delft)
Prasanna K. Rout (Kavli institute of nanoscience Delft, TU Delft - QuTech Advanced Research Centre, TU Delft - QRD/Goswami Lab)
Nayan A. Jainandunsing (Kavli institute of nanoscience Delft, Student TU Delft)
Dibyendu Kuiri (AGH University of Science and Technology)
Chung Ting Ke (TU Delft - QRD/Goswami Lab, Kavli institute of nanoscience Delft)
Di Xiao (Purdue University)
Candice Thomas (Purdue University)
Michael J. Manfra (Microsoft, Purdue University)
Michał P. Nowak (AGH University of Science and Technology)
Srijit Goswami (TU Delft - QuTech Advanced Research Centre, Kavli institute of nanoscience Delft, TU Delft - QRD/Goswami Lab)
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Abstract
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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