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DTSTART:20220327T030000
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DTSTAMP:20260405T054100Z
UID:617a5ff705edc279857453@ist.ac.at
DTSTART:20211122T110000
DTEND:20211122T120000
DESCRIPTION:Speaker: Gaël Grissonnanche\nhosted by Kimberly Modic\nAbstrac
 t: The thermal Hall effect has been proposed as a powerful tool to probe e
 xotic topological excitations in quantum spin liquids\, with the spectacul
 ar report of a half-quantized thermal Hall effect in the Kitaev material 
 α-RuCl3 [1\,2]. These results hold much promise for quantum computing.How
 ever\, it is becoming surprisingly apparent that phonons can also produce 
 a large thermal Hall effect across a wide range of quantum materials\, fro
 m cuprate superconductors [3\,4] to the titanates [5] and frustrated magne
 ts [6]. A significant phonon Hall effect is also suspected in α-RuCl3 [7]
 . While phonons carry no charge and are common low energy excitations in s
 olids\, the origin of the handedness that gives rise to a phonon Hall effe
 ct in a magnetic field remains an enigma. Besides\, the present ubiquity o
 f the phonon Hall effect calls for caution when interpreting the results o
 f quantum spin liquids candidates.During this seminar\, I will share the s
 ignatures of the thermal Hall effect of phonons and how we came to discove
 r it\; why this is interesting\, and how we can learn about quantum materi
 als through this journey of serendipitous discoveries. By the end of the p
 resentation\, I hope to convince you that the thermal Hall effect is a tec
 hnique that needs to be more fully/carefully exploited experimentally and 
 the phonon Hall effect a property that needs to be better understood theor
 etically.References: [1] Kasahara et al.\, Nature 559\, 277 (2018)\; [2] 
 Yokoi et al.\, Science 373\, 6554 (2021)\; [3] Grissonnanche et al.\, Natu
 re 571\, 376 (2019)\; [4] Grissonnanche et al.\, Nat. Phys. 16\, 1108 (202
 0)\; [5] Li et al.\, PRL 105\, 225901 (2020)\; [6] Hirokane et al. PRB 9
 9\, 134419 (2019)\; [7] Hentrich et al. PRB 99\, 085136 (2019)
LOCATION:Big Seminar Room B (big) 63 seats (I23.EG.102)\, ISTA
ORGANIZER:cpetz@ist.ac.at
SUMMARY:Gaël Grissonnanche: Chiral phonons in quantum materials
URL:https://talks-calendar.ista.ac.at/events/3403
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