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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20220610T110000
DTEND;TZID=Europe/Paris:20220610T110000
DTSTAMP:20220530T152100
UID:MEC-7c220a2091c26a7f5e9f1cfb099511e3@lps.u-psud.fr
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SUMMARY:Gael Grissonnanche | Chiral phonons in quantum materials
DESCRIPTION:\nGael Grissonnanche, \n\n\n\nThe thermal Hall effect has been proposed as a powerful tool to probe exotic topological excitations in quantum spin liquids, with the spectacular report of a half-quantized thermal Hall effect in the Kitaev material α-RuCl3 [1,2]. These results hold much promise for quantum computing.\n\n\n\nHowever, it is becoming surprisingly apparent that phonons can also produce a large thermal Hall effect across a wide range of quantum materials, from cuprate superconductors [3,4] to the titanates [5] and frustrated magnets [6]. A significant phonon Hall effect is also suspected in α-RuCl3 [7, 8]. While phonons carry no charge and are common low energy excitations in solids, the origin of the handedness that gives rise to a phonon Hall effect in a magnetic field remains an enigma. Besides, the present ubiquity of the phonon Hall effect calls for caution when interpreting the results of quantum spin liquids candidates.\n\n\n\nDuring the talk, I will share the signatures of the thermal Hall effect of phonons and how we came to discover it; why this is interesting, and how we can learn about quantum materials through this journey of serendipitous discoveries. By the end of the presentation, I hope to convince you that the thermal Hall effect is a technique that needs to be more fully/carefully exploited experimentally and the phonon Hall effect a property that needs to be better understood theoretically.\n\n\n\nReferences\n\n\n\n[1] Kasahara et al., Nature 559, 277 (2018)\n\n\n\n[2] Yokoi et al., Science 373, 6554 (2021)\n\n\n\n[3] Grissonnanche et al., Nature 571, 376 (2019)\n\n\n\n[4] Grissonnanche et al., Nat. Phys. 16, 1108 (2020)\n\n\n\n[5] Li et al., PRL 105, 225901 (2020)\n\n\n\n[6] Hirokane et al. PRB 99, 134419 (2019)\n\n\n\n[7] Hentrich et al. PRB 99, 085136 (2019)\n\n\n\n[8] Lefrançois et al. PRX 12, 0021025 (2022)\n
URL:https://www.lps.u-psud.fr/events/gael-grissonnanche-chiral-phonons-in-quantum-materials/
CATEGORIES:Séminaire Matière Quantique (SMQ),Séminaires
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