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SUMMARY:Polarons\, Rashba spin splitting and Ising superconductivity in el
 ectron doped MoSe2
DTSTART:20240328T110000
DTSTAMP:20260416T105240Z
UID:3acfad1fcc461aef157c5dd8ff278ae5916918dfd24839b61541cb2b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Timur Kim Diamond Light Source\, UK\nCoupling between elec
 trons and phonons in solids is a key effect defining physical properties o
 f materials such as electrical and thermal conductivity. In transitional m
 etal dichalcogenides (TMDCs) the electron-phonon coupling results in the c
 reation of polarons\, quasiparticles that manifest themselves as discrete 
 features in the electronic spectral function. Holstein polarons\, driven b
 y the multi-valley electron-phonon scattering\, have been observed on an a
 lkali-dosed MoS2 surface\, however the experimentally measured spectral fu
 nction did not display any spin-split features. In this study\, we report 
 the formation of polarons at the alkali-dosed MoSe2 surface\, where Rashba
 -like spin splitting of the valence band states is caused by a strong inve
 rsion-symmetry breaking electric field. In addition\, we observed the cros
 sover from phonon to plasmon-like polaronic spectral features at MoSe2 sur
 face with increased amount of dosed alkali metal atoms. Our findings suppo
 rt the concept of polaron mediated superconductivity in electron-doped lay
 ered TMDC materials\, observed using ionic liquid gating technology. Furth
 ermore\, the discovered spin-splitting at the Fermi level could offer cruc
 ial experimental validation for theoretical models of Ising-type supercond
 uctivity in these materials.\n\n© 2024 EPFL\n\n\nPhonon-mediated polarons
  in electron doped MoSe2:\n(a) Multi-valley scattering of conduction elect
 rons in the 1st Brillouin zone of MoSe2\;\n(b) DFT calculated phonon dispe
 rsion for MoSe2\;\n(c) Simulated electron-like parabolic band at K-point 
 with Holstein polarons\;\n(d) DFT calculated electronic band structure of 
 monolayer MoSe2 including SOC.
LOCATION:PH L1 503 https://plan.epfl.ch/?room==PH%20L1%20503 https://epfl.
 zoom.us/j/89778378177?pwd=VXNRZ3hJVnozMDNoR3lvZ2IwZzhXUT09
STATUS:CONFIRMED
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