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DTSTART;TZID=Europe/Paris:20260702T140000
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DTSTAMP:20260626T080837Z
CREATED:20260626T060758Z
LAST-MODIFIED:20260626T080837Z
UID:12407-1783000800-1783006200@fermi.univ-tlse3.fr
SUMMARY:The thermal Hall response of the phonon gas -  (Kamran Behnia /  LNCMI / Seminar). - 2/07/2026\, 14H
DESCRIPTION:Seminar LNCMI \nKamran Behnia\, Laboratoire de Physique et Etude de Matériaux (ESPCI\, Université Paris Sciences & Lettres\, CNRS) \nSeminar LNCMI\, 2/07/2026\, 14H\, LNCMI\, Toulouse \nAbstract\nFirst observed two decades ago [1]\, the phonon Hall effect\, is nowadays observed in numerous insulators\, including non-magnetic ones [2-4].\nThe observation implies a field-induced misalignment between the heat flux and the entropy flux vectors. Phonon thermal Hall conductivity peaks when most phonon-phonon collisions become normal\, indicating a link with phonon hydrodynamics and a magnetic field induced change in the balance of three phonon events.\nThis conjecture is backed by the case of molecular gases subject to magnetic field. In their case\, the Seftleben-Beenakker effect [5] arises due to the field-induced modification of the molecular collision cross sections. The breakdown of the Born-Oppenheimer approximation in a magnetic field can offer a geometric [Berry] phase to ordinary acoustic phonons. A picture\, which would explain the experimentally observed bound to the thermal Hall of elemental insulators [6]. \n[1] C. Strohm\, G. L. J. A. Rikken and P. Wyder\, Phys. Rev. Lett. 95\, 155901 (2005).\n[2] X. Li\, B. Fauqué\, Z. Zhu\, and K. Behnia\, Phys. Rev. Lett. 124\, 105901 (2020).\n[3] X. Li\, Y. Machida\, A. Subedi\, Z. Zhu\, L. Li & K. Behnia\, Nature Comm. 14\, 1027 (2023).\n[4] X. B. Jin et al.\, Phys. Rev. Lett. 135\, 196302 (2025).\n[5] L. Hermans\, A. Schutte\, H. Knaap\, and J. Beenakker\, Physica 46\, 491 (1970).\n[6] K. Behnia\, Phonon thermal Hall as a lattice Aharonov-Bohm effect\, SciPost Phys. Core 8\, 061 (2025). \nLien Zoom : https://univ-grenoble-alpes-fr.zoom.us/j/94228207316?pwd=khTdznxeFy1ZUYkYftQ0QSox6Fz3iK.1
URL:https://fermi.univ-tlse3.fr/event/the-thermal-hall-response-of-the-phonon-gas-kamran-behnia-lncmi-seminar-2-07-2026-14h/
LOCATION:Salle de seminaire du LNCMI\, Champs Magnétiques Pulsés\, 143 avenue de Rangueil\, Toulouse\, France
CATEGORIES:Events,LNCMI,Seminars
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