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Title: Phonon Helicity Induced by Electronic Berry Curvature in Dirac Materials

Journal Article · · Physical Review Letters
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]
  1. Pennsylvania State Univ., University Park, PA (United States); Pennsylvania State University
  2. Univ. of Maryland, College Park, MD (United States); Pennsylvania State Univ., University Park, PA (United States)
  3. Univ. of Sherbrooke, QC (Canada)
  4. Pennsylvania State Univ., University Park, PA (United States)

In two-dimensional insulators with time-reversal (TR) symmetry, a nonzero local Berry curvature of low-energy massive Dirac fermions can give rise to nontrivial spin and charge responses, even though the integral of the Berry curvature over all occupied states is zero. In this Letter, we present a new effect induced by the electronic Berry curvature. By studying electron-phonon interactions in BaMnSb2, a prototype two-dimensional Dirac material possessing two TR-related massive Dirac cones, we find that the nonzero local Berry curvature of electrons can induce a phonon angular momentum. The direction of this phonon angular momentum is locked to the phonon propagation direction, and thus we refer to it as “phonon helicity” in a way that is reminiscent of electron helicity in spin-orbit-coupled electronic systems. We discuss possible experimental probes of such phonon helicity.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE; US Department of the Navy, Office of Naval Research (ONR); Canada First Research Excellence Fund (CFREF); Natural Sciences and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
SC0019064
OSTI ID:
1820690
Alternate ID(s):
OSTI ID: 1829063
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 127; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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