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

Journal Article · · Physical Review. B
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Rutgers University, Piscataway, NJ (United States); Université de Sherbrooke, Quebec (Canada)
  2. Rutgers University, Piscataway, NJ (United States)
  3. 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.

Research Organization:
Rutgers Univ., Piscataway, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Canada First Research Excellence Fund; Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF)
Grant/Contract Number:
SC0020353; RGPIN-2019-05312; PHY2210452
OSTI ID:
1997006
Journal Information:
Physical Review. B, Vol. 108, Issue 7; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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