Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U44: Electrons, Phonons, Electron Phonon Scattering, and Phononics VI
2:30 PM–5:06 PM,
Thursday, March 5, 2020
Sponsoring Units: DCOMP DMP
Chair: Hans Braun, University of Bayreuth
Abstract: U44.00008 : First-principles charge transport including electron-two-phonon scattering processes
In this talk, we address the question of how the e-2ph processes affect transport. We derive a Boltzmann transport equation (BTE) that incorporates both one-phonon and two-phonon scattering, and solve it both within the relaxation time approximation and with an iterative approach (ITA). We compute the mobility in GaAs at 200-400 K, and show that the BTE-ITA with e-2ph processes gives a mobility in excellent agreement with experiments, resolving the known mobility overestimate in the BTE-ITA with one-phonon processes only. Future extensions to strongly polar materials will also be discussed.
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