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TT: Fachverband Tiefe Temperaturen
TT 63: Focus Session: Emerging Magnetic Phenomena from Chiral Phonons I (joint session MA/TT)
TT 63.3: Hauptvortrag
Donnerstag, 21. März 2024, 10:30–11:00, H 1058
Phonon chirality and thermal Hall transport — •Benedetta Flebus1 and Allan H. MacDonald2 — 1Department of Physics, Boston College, 140 Commonwealth Avenue, Chestnut Hill, Massachusetts 02467, USA — 2Department of Physics, the University of Texas at Austin, Austin, Texas 78712, USA
In recent years, a rapidly increasing amount of studies has reported novel physical phenomena arising from lattice vibrations that carry angular momentum, i.e., chiral phonons. In this talk, I will discuss both intrinsic and extrinsic sources of chiral phonon transport. First, I will show that in ionic crystals a phonon Hall viscosity contribution can emerge as a result of the Lorentz forces on moving ions [1]. I will then explain how phonon scattering from defects that break time-reversal symmetry, such as charged impurities, can yield giant thermal Hall effects that are consistent with recent experimental observations [2].
[1] B. Flebus and A. H. MacDonald, The phonon Hall viscosity of ionic crystals, Phys. Rev. Lett. (in press). [2] B. Flebus and A. H. MacDonald, Charged defects and phonon Hall effects in ionic crystals, Phys. Rev. B 105 (22), L220301 (2022).
Keywords: Chiral phonons; Thermal Hall effect