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Pinning of Andreev bound states to zero energy in two-dimensional superconductor- semiconductor Rashba heterostructures

Dmytruk, Olesia and Loss, Daniel and Klinovaja, Jelena. (2020) Pinning of Andreev bound states to zero energy in two-dimensional superconductor- semiconductor Rashba heterostructures. Physical Review B, 102 (24). p. 245431.

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Official URL: https://edoc.unibas.ch/80709/

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Abstract

We consider a two-dimensional electron gas (2DEG) with Rashba spin-orbit interaction (SOT) partially covered by an s-wave superconductor, where the uncovered region remains normal but is exposed to a perpendicular Zeeman field. We find analytically and numerically Andreev bound states (ABSs) formed in the normal region and show that, by tuning the SOI to certain values, one can reach a regime where the energy of the lowest ABS becomes pinned close to zero as a function of Zeeman field. In addition, we also consider a configuration with a superconducting vortex and find again ABSs pinned close to zero energy in the topologically trivial phase for a wide range of parameters. Thus, ABSs and Majorana bound states show similar behavior in such structures.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Klinovaja, Jelena
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:2469-9950
e-ISSN:2469-9969
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:04 May 2021 14:23
Deposited On:04 May 2021 14:21

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