MPSD Seminar

7683 1479296282

Sergey Brener - Some aspects of intrinsic electron-photon interaction in black phosphorus

  • Datum: 21.11.2016
  • Uhrzeit: 14:00 - 15:00
  • Vortragende(r): Sergey Brener
  • Radboud University, Nijmegen, Netherlands
  • Ort: CFEL (Bldg. 99)
  • Raum: Seminar Room V, O1.109
  • Gastgeber: Angel Rubio
Flexural and in-plane thermal fluctuations in crystalline membranes affect the band structure of the carriers, which has an effect on transport properties as well as carrier density of states of 2D systems. I consider a specific example of one-layer black phosphorus, which is a highly anisotropic material, and present our recent results on intrinsic carrier mobility. In contrast to graphene, where the mobility is determined by two-phonon (flexural) scattering, in black phosphorus one-phonon (in-plane) processes dominate. I also will show the results on DOS tail for holes in black phosphorus that have quasi-one-dimensional dispersion (my /mx » 1) and, as a result, an enhanced Van Hove singularity at the valence band top. Interaction with flexural phonons results in smearing of this singularity and to an appearing of a tail in DOS in the gap. The material parameters are determined by ab initio GW calculations and then are used for quantitative estimation of the above-mentioned effects.
 
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