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  Fermi surface segmentation in the helical state of a Rashba superconductor

Akbari, A., & Thalmeier, P. (2022). Fermi surface segmentation in the helical state of a Rashba superconductor. Physical Review Research, 4(2): 023096, pp. 1-13. doi:10.1103/PhysRevResearch.4.023096.

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 Creators:
Akbari, Alireza1, Author              
Thalmeier, Peter2, Author              
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

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Free keywords: Fermi surface, Superconducting materials, Cooper pair, Finite momentum, Fulde-Ferrell, Helical state, Inversion symmetry, Quasiparticles excitation, Rashba coupling, Rashba spin-orbit coupling, Surface segmentation, Symmetry breakings, Momentum
 Abstract: We investigate the quasiparticle excitations in the Fulde-Ferrell-type helical state of a superconductor with inversion symmetry breaking and strong Rashba spin-orbit coupling. We restrict to a state with single finite momentum of Cooper pairs in the helical phase that is determined by minimization of the condensation energy. We derive the dependence of quasiparticle dispersions on the Rashba coupling strength and external field. It leads to a peculiar momentum-space segmentation of the corresponding Rashba Fermi surface sheets. We show that it may be directly visualized by the method of quasiparticle interference that identifies the critical points of the segmented sheets and can map their evolution with field strength, bias voltage, and Rashba coupling. We also indicate a strategy for how to determine the finite Cooper-pair momentum from experimental quantities. This investigation has the potential for a more detailed microscopic understanding of the helical superconducting state under the influence of Rashba spin-orbit coupling. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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Language(s): eng - English
 Dates: 2022-05-032022-05-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevResearch.4.023096
 Degree: -

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Title: Physical Review Research
  Alternative Title : Phys. Rev. Res.
Source Genre: Journal
 Creator(s):
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Publ. Info: American Physical Society
Pages: - Volume / Issue: 4 (2) Sequence Number: 023096 Start / End Page: 1 - 13 Identifier: ISBN: 26431564 (ISSN)