Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 63: Focus Session: Emerging Magnetic Phenomena from Chiral Phonons I (joint session MA/TT)

TT 63.3: Invited Talk

Thursday, March 21, 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