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PRODID:-//Memento EPFL//
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SUMMARY:CECAM Workshop: "Chiral Phonons in Quantum Materials"
DTSTART:20230717T123000
DTEND:20230719T163000
DTSTAMP:20260508T135814Z
UID:1d5324de3a31a0a85ce7f1ba950ec67dfac43281fa2627d7bea8ab89
CATEGORIES:Conferences - Seminars
DESCRIPTION:You can apply to participate and find all the relevant informa
 tion (speakers\, abstracts\, program\,...) on the event website: https://
 www.cecam.org/workshop-details/1202\n\nDescription\nAngular momentum coupl
 ing lies at the heart of many fundamental physical phenomena. For example\
 , the spin-orbit interaction\, which couples the spin and orbital angular 
 momenta of electrons or nuclei\, famously leads to the fine and hyperfine 
 splittings of electronic energy levels in atoms. In solids\, the breaking 
 of time-reversal symmetry by electronic angular momentum enables complex m
 agnetic and topological orders exhibiting various Hall effects\, as well a
 s chiral phases ranging from chiral spin liquids to chiral superconductors
 . At the same time\, the angular momentum of light is a well-established q
 uantity\, which can interact with the electrons and nuclei to either disti
 nguish or induce chirality in atomic\, molecular\, and solid-state systems
 .\nOver the last few years\, a rapidly increasing amount of research has f
 ocused on the angular momentum generated by vibrations of the crystal latt
 ice (phonons) in solids. Phonon angular momentum is made up by circular or
  elliptical orbital motions of the atoms around their equilibrium lattice 
 positions and the resulting collective vibrational pattern is called a chi
 ral phonon mode [1\, 2]. The existence of chiral phonons and phonon angula
 r momentum leads to a rich variety of novel collective phenomena\, where r
 ecent examples from theoretical\, computational\, and experimental work in
 clude the phonon Hall [3\, 4]\, phonon Einstein-de Haas [5\, 6]\, phonon F
 araday [7\, 8]\, and phonon Zeeman effects [8\, 9].\nSo far\, research on 
 chiral phonons and phonon angular momentum has evolved in parallel within 
 different areas of condensed matter physics and materials science\, includ
 ing\, most prominently\, the spintronics community\, the two-dimensional (
 2D) optoelectronics community\, the ultrafast dynamics community\, and the
  thermal transport community. Although the underlying physical mechanisms 
 are all associated with phonon angular momentum\, there has been surprisin
 gly little cross-interaction between the different fields. The methodologi
 es and materials systems have mostly been orthogonal\, and even the defini
 tions of chiral phonons vary. In this workshop\, we aim to bring members f
 rom these different communities together in order to discuss the phenomena
  arising from chiral phonons across fields under the overarching principle
  of phonon angular momentum coupling. We believe that discussing chiral ph
 onon physics within a unified workshop will strengthen interdisciplinary r
 esearch efforts and enable cross-investigations of fundamental questions r
 elated to angular momentum in solids.\nIn particular\, we aim to bring mem
 bers from the following communities and working on following specific topi
 cs together:\n1) Magnetism and spintronics: Spin-phonon coupling and inter
 actions of chiral phonons with magnetic fields\, phonon magnetic moments\,
  Zeeman and Faraday effects of chiral phonons\, chiral phonon-mediated exc
 hange\, and spin relaxation.\n2) 2D optoelectronics: Electron- and exciton
 -phonon coupling of chiral phonons in layered and 2D materials\, chiral ph
 onons in Moiré lattices\, and phonon angular momentum coupling to topolog
 ical electronic band structures.\n3) Ultrafast dynamics: Coherent excitati
 on of chiral phonons with ultrashort laser pulses\, dynamical time reversa
 l symmetry breaking\, dynamical multiferroicity\, generation of effective 
 magnetic fields\, and ultrafast control of magnetic order.\n4) Transport a
 nd Hall effects: Contributions of chiral phonons to thermal transport and 
 expansion\, thermal Hall effects based on phonon angular momentum\, chiral
  phonons in cuprate superconductors.\n\nReference\n[1] L. Zhang\, Q. Niu\,
  Phys. Rev. Lett.\, 115\, 115502 (2015)\n[2] H. Zhu\, J. Yi\, M. Li\, J. 
 Xiao\, L. Zhang\, C. Yang\, R. Kaindl\, L. Li\, Y. Wang\, X. Zhang\, Scien
 ce\, 359\, 579-582 (2018)\n[3] G. Grissonnanche\, A. Legros\, S. Badoux\,
  E. Lefrançois\, V. Zatko\, M. Lizaire\, F. Laliberté\, A. Gourgout\, J.
  Zhou\, S. Pyon\, T. Takayama\, H. Takagi\, S. Ono\, N. Doiron-Leyraud\, L
 . Taillefer\, Nature\, 571\, 376-380 (2019)\n[4] G. Grissonnanche\, S. Th
 ériault\, A. Gourgout\, M. Boulanger\, E. Lefrançois\, A. Ataei\, F. Lal
 iberté\, M. Dion\, J. Zhou\, S. Pyon\, T. Takayama\, H. Takagi\, N. Doiro
 n-Leyraud\, L. Taillefer\, Nat. Phys.\, 16\, 1108-1111 (2020)\n[5] C. Dor
 nes\, Y. Acremann\, M. Savoini\, M. Kubli\, M. Neugebauer\, E. Abreu\, L. 
 Huber\, G. Lantz\, C. Vaz\, H. Lemke\, E. Bothschafter\, M. Porer\, V. Esp
 osito\, L. Rettig\, M. Buzzi\, A. Alberca\, Y. Windsor\, P. Beaud\, U. Sta
 ub\, D. Zhu\, S. Song\, J. Glownia\, S. Johnson\, Nature\, 565\, 209-212 
 (2019)\n[6] S. Tauchert\, M. Volkov\, D. Ehberger\, D. Kazenwadel\, M. Eve
 rs\, H. Lange\, A. Donges\, A. Book\, W. Kreuzpaintner\, U. Nowak\, P. Bau
 m\, Nature\, 602\, 73-77 (2022)\n[7] T. Nova\, A. Cartella\, A. Cantalupp
 i\, M. Först\, D. Bossini\, R. Mikhaylovskiy\, A. Kimel\, R. Merlin\, A. 
 Cavalleri\, Nature. Phys.\, 13\, 132-136 (2016)\n[8] D. Juraschek\, M. Fe
 chner\, A. Balatsky\, N. Spaldin\, Phys. Rev. Materials\, 1\, 014401 (201
 7)\n[9] A. Baydin\, F. Hernandez\, M. Rodriguez-Vega\, A. Okazaki\, F. Tay
 \, G. Noe\, I. Katayama\, J. Takeda\, H. Nojiri\, P. Rappl\, E. Abramof\, 
 G. Fiete\, J. Kono\, Phys. Rev. Lett.\, 128\, 075901 (2022)\n 
LOCATION:LUGANO\, Aula Magna\, USI Lugano
STATUS:CONFIRMED
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