Phonon-induced collective modes in spin-orbit coupled polar metals

Kumar, Abhishek; Chandra, Premala; Volkov, Pavel A.

doi:10.1103/physrevb.108.075162

Title: Phonon-induced collective modes in spin-orbit coupled polar metals

Journal Article · 28 August 2023 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.108.075162 · OSTI ID:1997006

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Rutgers University, Piscataway, NJ (United States); Université de Sherbrooke, Quebec (Canada); Rutgers University
Rutgers University, Piscataway, NJ (United States)
Rutgers University, Piscataway, NJ (United States); Harvard University, Cambridge, MA (United States); University of Connecticut, Storrs, CT (United States)

We study the interplay between collective electronic and lattice modes in polar metals in an applied magnetic field aligned with the polar axis. Static spin-orbit coupling leads to the appearance of a particle-hole spin-flip continuum that is gapped at low energies in a finite field. We find that a weak spin-orbit assisted coupling between electrons and polar phonons induces the emergence of electronic collective modes. The strength of the applied magnetic field tunes the number of modes and their energies, which can lie both above and below the particle-hole continuum. For a range of field values, we identify Fano-type interference between the electronic continuum and phonons. Here, we show that signatures of these collective modes can be observed in optical spectroscopy experiments, and we provide the corresponding theoretical predictions.

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Research Organization:: Rutgers University, Piscataway, NJ (United States)

Sponsoring Organization:: Canada First Research Excellence Fund; National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0020353

OSTI ID:: 1997006

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 7 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Phonon-induced collective modes in spin-orbit coupled polar metals

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