Electronic heat generation in semiconductors: Non-equilibrium excitation and evolution of zone-edge phonons via electron–phonon scattering in photo-excited germanium

Author:

Murphy-Armando F.1ORCID,Murray É. D.1,Savić I.1ORCID,Trigo M.2ORCID,Reis D. A.23ORCID,Fahy S.14ORCID

Affiliation:

1. Tyndall National Institute, University College 1 , Cork, Ireland

2. PULSE Institute, SLAC National Accelerator Laboratory 2 , Menlo Park, California 94025, USA

3. Department of Photon Science and Applied Physics, Stanford University 3 , Stanford, California 94305, USA

4. Department of Physics, University College 4 , Cork, Ireland

Abstract

We investigate experimentally and using first-principles theory the generation of phonons and the relaxation of carriers on picosecond timescales across the Brillouin zone of photo-excited Ge by inter-valley electron–phonon scattering. The phonons generated are typical of those generated in semiconductor devices, contributing to the accumulation of heat within the material. We simulate the time-evolution of phonon populations, based on first-principles band structure and electron–phonon and phonon–phonon matrix elements, and compare them to data from time-resolved x-ray diffuse scattering experiments, performed at the Linac Coherent Light Source x-ray free-electron laser facility, following photo-excitation by a 50 fs near-infrared optical pulse. We show that the intensity of the non-thermal x-ray diffuse scattering signal, which is observed to grow substantially near the L-point of the Brillouin zone over 3–5 ps, is due to phonons generated by scattering of carriers between the Δ and L valleys. These phonons have low group velocities, resulting in a heat bottleneck. With the inclusion of phonon decay through 3-phonon processes, the simulations also account for other non-thermal features observed in the x-ray diffuse scattering intensity, which are due to anharmonic phonon–phonon scattering of the phonons initially generated by electron–phonon scattering.

Funder

Science Foundation Ireland

European Commission

U.S. Department of Energy

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Ultrafast Spectroscopy in Solid Matter;Structural Dynamics with X-ray and Electron Scattering;2023-12-20

2. Long-lasting deformation potential effect in Ge induced by UV photoexcitation;Journal of Applied Physics;2023-07-17

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