Signatures of topological superconductivity in Josephson junctions
ORAL
Abstract
Topological superconductivity is a phase of matter supporting Majorana bound states, quasiparticles that store information in a nonlocal manner and can be used as qubits that are robust against local perturbations. We theoretically investigate the emergence of topological superconductivity in Josephson junctions with tunable chemical potential and Rashba spin-orbit coupling, subjected to an in-plane magnetic field. As the magnetic field along the junction increases above some critical value the system experiences a transition from the trivial to the topological superconducting phase. Theoretical simulations show that such a transition is accompanied by a minimum in the critical current and a corresponding jump in the phase difference across the junction. The sensitivity of the topological transition to the in-plane magnetization direction provides and additional fingerprint for the emergence of topological superconductivity. The theoretical simulations are in good agreement with the recent experimental detection of topological phase transitions in gate-tunable JJs built on epitaxial Al/InAs [1].
[1] M. C. Dartiailh et al., arXiv: 1906.01179
[1] M. C. Dartiailh et al., arXiv: 1906.01179
*This work was supported by DARPA Topological Excitations in Electronics, Grant No. DP18AP90000.
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Presenters
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Alex Matos Abiague
- Wayne State Univ
- Department of Physics and Astronomy, Wayne State University
- Wayne State University
- Physics and Astronomy, Wayne State University