Bulletin of the American Physical Society
APS March Meeting 2023
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G50: Quantum Simulations of Coherent States of Matter
11:30 AM–2:30 PM,
Tuesday, March 7, 2023
Room: Room 320
Sponsoring Unit: DCOMP
Chair: Kade Head-Marsden, Washington University in St. Louis
Abstract: G50.00003 : Interactions of Electron Spin with Phonons: Spin Relaxation and Decoherence in Condensed Matter from First Principles*
12:42 PM–1:18 PM
In this talk, I will present a rigorous framework to compute spin-phonon interactions and phonon-induced spin relaxation and decoherence in condensed matter [1,2]. Our method unifies the treatment of two key spin-phonon processes – spin scattering off phonons and spin precession altered by phonons – commonly known as Elliott-Yafet and Dyakonov-Perel mechanisms. This scheme computes the phonon-dressed vertex correction of the spin susceptibility, with a treatment analogous to the anomalous electron magnetic moment in QED, by solving numerically a spin-phonon Bethe-Salpeter equation. These calculations rely on ab initio electron-phonon interactions including spin-orbit coupling [3,4].
I will show accurate predictions of spin relaxation times of electron and hole carriers in key semiconductors for quantum technologies (Si, Ge and GaAs) and in 2D materials. Both spin relaxation and spin precession will be analyzed, showing that the spin-phonon interactions lead to a colossal renormalization of electron spin dynamics in solids. I will conclude by discussing open questions and ongoing work, including: (i) studying spin relaxation in magnetic materials and spin decoherence in semiconducting qubits, (ii) computing higher-order spin-phonon processes, and (iii) making these new methods available in our open-source Perturbo code .
*This work was supported by the National Science Foundation under Grants No. DMR-1750613 and QII-TAQS 1936350, which provided for method development, and Grant No. OAC-2209262, which provided for code development. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility located at Lawrence Berkeley National Laboratory, operated under Contract No. DE-AC02-05CH11231.
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