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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260611T031111Z
UID:https://www.mpsd.mpg.de/events/9630/17181
DTSTART:20170411T093000Z
DTEND:20170411T103000Z
CLASS:PUBLIC
CREATED:20170412T143314Z
DESCRIPTION: The valley degree of freedom and the possibility of spin-valle
 y coupling of solid materials have attracted growing interest\, and the re
 laxation dynamics of spin- and valley-polarized states has become an impor
 tant focus of recent studies. In spin-orbit-coupled inversion-asymmetric t
 wo-dimensional materials\, such as MoS<sub>2</sub>\, it has been found tha
 t the spin randomization is characteristically faster than the time scales
  for inter- and intra-valley scatterings. In this talk\, I present our rec
 ent study of the ultrafast non-collinear spin dynamics of the electron in 
 a valley of monolayer MoS2 by using real-time propagation time-dependent d
 ensity functional theory. We found that the spin precession is sharply sel
 ectively coupled only with the particular optical phonon that lifts the in
 -plane mirror symmetry. We suggest that the observed spin randomization ca
 n be attributed to this spin-phonon interaction. Further\, our results imp
 ly that flipping of spins in a spin-orbit-coupled system can be achieved b
 y the control over phonons. In a later part of the talk\, I would also des
 cribe the feature of the computational package we have developed and have 
 used for the spin-phonon dynamics\, which is based on the plane-wave basis
  set and various types of pseudopotentials.\nSpeaker: Noejung Park
LAST-MODIFIED:20170412T143314Z
LOCATION:CFEL (Bldg. 99)\, Room: Seminar Room IV\, O1.111
ORGANIZER;CN=Angel Rubio:mailto:
SUMMARY:MPSD Seminar: Noejung Park - Ab initio study of ultrafast dynamics 
 of spin-valley polarized states in TMDC with a particular focus on the rol
 e of phonon 
URL;VALUE=URI:https://www.mpsd.mpg.de/events/9630/17181
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