Journal
PHYSICAL REVIEW LETTERS
Volume 124, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.167601
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Funding
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4302]
- U.S. Department of Energy (DOE) Office of Basic Energy Science, Division of Materials Science and Engineering at Stanford [DE-AC02-76SF00515]
- DOEOffice of Science, Office of High Energy Physics [DE-SC0019380]
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In the context of recent experimental observations of an unexpectedly large thermal Hall conductivity, kappa(H), in insulating La2CuO4 (LCO) and SrTiO3 (STO), we theoretically explore conditions under which acoustic phonons can give rise to such a large kappa(H). Both the intrinsic and extrinsic contributions to kappa(H) are large in proportion to the dielectric constant, epsilon, and the flexoelectric coupling, F. While the intrinsic contribution is still orders of magnitude smaller than the observed effect, an extrinsic contribution proportional to the phonon mean-free path appears likely to account for the observations, at least in STO. We predict a larger intrinsic kappa(H) in certain insulating perovskites.
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