Topological superconductivity from forward phonon scatterings

Li, Shaozhi; Hu, Lun-Hui; Zhang, Rui-Xing; Okamoto, Satoshi

doi:10.1038/s42005-023-01311-z

Title: Topological superconductivity from forward phonon scatterings

Journal Article · 28 August 2023 · Communications Physics

DOI: https://doi.org/10.1038/s42005-023-01311-z · OSTI ID:1997721

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
University of Tennessee, Knoxville, TN (United States)

Searching for topological superconductors with non-Abelian states has been attracting broad interest. The most commonly used recipe for building topological superconductors utilizes the proximity effect, which significantly limits the working temperature. Here, we propose a mechanism to attain topological superconductivity via forward phonon scatterings. Our crucial observation is that electron-phonon interactions with small momentum transfers favor spin-triplet Cooper pairing under an applied magnetic field. This process facilitates the formation of chiral topological superconductivity even without Rashba spin-orbit coupling. As a proof of concept, we propose an experimentally feasible heterostructure to systematically study the entangled relationship among forward-phonon scatterings, Rashba spin-orbit coupling, pairing symmetries, and the topological property of the superconducting state. This theory not only deepens our understanding of the superconductivity induced by the electron-phonon interaction but also sheds light on the critical role of the electron-phonon coupling in pursuing non-Abelian Majorana quasiparticles.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1997721

Journal Information:: Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 6; ISSN 2399-3650

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Topological superconductivity from forward phonon scatterings

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