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SUMMARY:Quantum topological effects in magnetization dynamics: the Berry p
 hase\, the Aharonov–Casher effect and electric field control of spin wav
 es dynamics
DTSTART;VALUE=DATE-TIME:20240925T074000Z
DTEND;VALUE=DATE-TIME:20240925T082000Z
DTSTAMP;VALUE=DATE-TIME:20260723T010347Z
UID:indico-contribution-307@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Volodymyr Kryvoruchko (Donetsk Physics & Technology 
 Institute named after O. O. Galkin\, NAS of Ukraine\, 46\, Nauki Avenue\, 
 03028 Kyiv)\nCondensed matter physics is revolutionizing by introducing to
 pology-based concepts that characterize a system's physical states and pro
 perties. An example of topological effects in magnetization dynamics is th
 e additional quantum mechanical phase\, the so-called Berry phase [1]\, an
 d the Aharonov–Casher (AC) effect [2]\, acquired by the quantum orbital 
 motion of chargeless bosonic quasiparticles with magnetic dipole moment 
 – e.g.\, spin waves (SWs) with magnetic moment µm = ±gµB – in mesos
 copic rings in an external electric (E) field. It manifests itself in a sh
 ift of the dispersion and the group velocity direction of SW by the E fiel
 d. In the linear approximation concerning the electric field\, the magnoni
 c AC effect can be considered by adding the Dzyaloshinskii-Moriya-like int
 eraction between neighboring spins. This topological quantum phenomenon ha
 s been directly detected experimentally for SWs propagating in the classic
 al magnetic insulator Y3Fe5O12 [3\,4]. The magnitude of the AC phase was t
 wo orders larger than previously estimated theoretically for centrosymmetr
 ic ferromagnet insulators. This finding allows for tuning the properties o
 f SWs\, an essential ingredient for magnonic devices\, by the E-field. Thr
 ough analytical calculations and micromagnetic simulations\, we demonstrat
 ed that in ferromagnetic\, antiferromagnetic\, and ferrimagnetic nanoscale
  films\, it is possible to control the SWs characteristics using an extern
 al E-field [5-9]. From the fundamental point of view\, the discussed quant
 um phenomena open a new avenue for quantifying topological effects in magn
 etization dynamics. The E-field control of SW dynamics in magnetic film ca
 n also be helpful for the development and designing of new magnonic nanode
 vices and could be utilized for quantum technologies. \nV.N.K. acknowledge
 s the financial support by the STCU\, project “Magnetism in Ukraine Init
 iative”\, project Agreement No. 9918. \n\n[1] M. V. Berry. Quantum phase
  factors accompanying adiabatic changes. Proc. R. Soc. London\, Ser. A 392
 \, 45 (1984).\n[2] Y. Aharonov\, A. Casher. Topological quantum effects fo
 r neutral particles. Phys. Rev. Lett. 53\, 319 (1984).\n[3] X. Zhang\, T. 
 Liu\, M. E. Flatté\, H. X. Tang. Electric field coupling to spin waves in
  a centrosymmetric ferrite. Phys. Rev. Lett. 113\, 037202 (2014).\n[4] R. 
 O. Serha\, V. I. Vasyuchka\, A. A. Serga\, B. Hillebrands. Towards an expe
 rimental proof of the magnonic Aharonov-Casher effect. Phys. Rev. B 108\, 
 L220404 (2023).\n[5] V. N. Krivoruchko\, A.S. Savchenko\, V. V. Kruglyak. 
 Electric-field control of spin-wave power flow and caustics in thin magnet
 ic films. Phys. Rev. B 98\, 024427 (2018).\n[6] V. N. Krivoruchko\, A.S. S
 avchenko. Electric-field control of nonreciprocity of spin wave excitation
  in ferromagnetic nanostripes. J. Magn. Magn. Mater. 474\, 9 (2019). \n[7]
  V. N. Krivoruchko. Aharonov–Casher effect and electric field control of
  magnetization dynamics. Low Temp. Phys. 46\, 820 (2020).\n[8] O. Boliasov
 a\, V. Krivoruchko. Electric-Field Control of Magnetization Dynamics in An
 tiferromagnets. 2023 IEEE Nanotechnology Materials and Devices Conference 
 (NMDC)\, Paestum (Salerno)\, Italy\; DOI:10.1109/NMDC57951.2023.10343910\n
 [9] V. N. Krivoruchko\, A.S. Savchenko. Controlled refraction and focusing
  of spin waves determined by the Aharonov-Casher effect. Phys. Rev. B 109\
 , 184437 (2024).\n\nhttps://indico.bitp.kiev.ua/event/13/contributions/307
 /
LOCATION:Bogolyubov Institute for Theoretical Physics (Section 1-4)\, Inst
 itute of Mathematics (Section 5) 322
URL:https://indico.bitp.kiev.ua/event/13/contributions/307/
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