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SUMMARY:Effective magnetic fields from optically driven chiral phonons
DTSTART:20230830T110000
DTEND:20230830T120000
DTSTAMP:20260407T051400Z
UID:3282bafb940f98abf7b92a55fef308336dd5be9ff663ffe0f580a942
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dominik Juraschek\nSchool of Physics and Astronomy\nTel 
 Aviv University\nIn dielectric materials\, chiral phonons carry magnetic m
 oments that are induced by orbital charge currents of the ions [1\,2]\, an
 d various coupling mechanisms\, including electron-phonon\, spin-phonon\, 
 and orbit-phonon coupling\, can enhance these phonon magnetic moments up t
 o the order of a Bohr magneton. When the chiral phonons are driven coheren
 tly with an ultrashort laser pulse\, macroscopic effective magnetic fields
  can be induced in the material that follow the phenomenology of a phonon 
 inverse Faraday or phonon Barnett effect [3-6]. Here\, we present three ex
 amples of how these effective magnetic fields can be utilized: First\, chi
 ral phonons in paramagnetic rare-earth trihalides are able to create giant
  effective magnetic fields of potentially up to 100 T that polarize the sp
 ins in the material [7]. Second\, the effective magnetic field produced by
  chiral phonons can rectify spin precession in antiferromagnets\, leading 
 to the quasistatic generation of magnetization through a transiently induc
 ed weak ferromagnetic state [8]. Third\, the phonon magnetic moment can be
  resonantly coupled to with the magnetic field component of light\, leadin
 g to a whole variety of new phenomena\, including the excitation of circul
 arly polarized phonons with linearly polarized light\, phononic frequency 
 up-conversion covering several orders of magnitude\, and the excitation of
  Raman-active phonons without Raman scattering [9].\n[1] D. Juraschek\, M.
  Fechner\, A. Balatsky\, N. Spaldin\, Phys. Rev. Materials\, 1\, 014401\n(
 2017)\n[2] D. Juraschek\, N. Spaldin\, Phys. Rev. Materials\, 3\, 064405 (
 2019)\n[3] D. Juraschek\, P. Narang\, N. Spaldin\, Phys. Rev. Research\, 2
 \, 043035 (2020)\n[4] M. Basini\, M. Pancaldi\, B. Wehinger\, M. Udina\, T
 . Tadano\, M. C. Hoffmann\, A. V.\nBalatsky and S. Bonetti\, arXiv:2210.01
 690\n[5] C. S. Davies\, F. G. N. Fennema\, A. Tsukamoto\, I. Razdolski\, A
 . V. Kimel and A.\nKirilyuk\, arXiv:2305.11551\n[6] J. Luo\, T. Lin\, J. Z
 hang\, X. Chen\, E. R. Blackert\, R. Xu\, B. I. Yakobson and H. Zhu\,\narX
 iv:2306.03852\n[7] D. Juraschek\, T. Neuman\, P. Narang\, Phys. Rev. Resea
 rch\, 4\, 013129 (2022)\n[8] T. Kahana and D. M. Juraschek\, arXiv:2305.18
 656\n[9] D. M. Juraschek and M. Fechner\, in preparation\n 
LOCATION:MXF 312 https://plan.epfl.ch/?room==MXF%20312
STATUS:CONFIRMED
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