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Ab initio Ultrafast Spin Dynamics in Solids by Xu, Junqing; Habib, Adela; Sundararaman, Ravishankar; Ping, Yuan is a scholarly article available to read on EtoBox.

What is Ab initio Ultrafast Spin Dynamics in Solids about?

Spin relaxation and decoherence is at the heart of spintronics and spin-based quantum information science. Currently, theoretical approaches that can accurately predict spin relaxation of general solids including necessary scattering pathways and capable for ns to ms simulation time are urgently needed. We present a first-principles real-time density-matrix approach based on Lindblad dynamics to simulate ultrafast spin dynamics for general solid-state systems. Through the complete first-principles descriptions of pump, probe and scattering processes including electron-phonon, electron-impurity and electron-electron scatterings with self-consistent electronic spin-orbit couplings, our method can directly simulate the ultrafast pump-probe measurements for coupled spin and electron dynamics over ns at any temperatures and doping levels. We first apply this method to a prototypical system GaAs and obtain excellent agreement with experiments. We find that the relative contributions of different scattering mechanisms and phonon modes differ considerably between spin and carrier relaxation processes. In sharp contrast to previous work based on model Hamiltonians, we point out that the ele

Author

Xu, Junqing; Habib, Adela; Sundararaman, Ravishankar; Ping, Yuan

Published

2020

Language

EN