Image of the Week: Electron-phonon relaxation on the Fermi surface of Pb
This week’s image comes from a recent paper by Rittweger et al., published in Journal of Physics: Condensed Matter, in which they investigate the electronic transport properties of face-centred cubic (fcc) bulk Pb in the presence of electron-phonon interaction. Using ab initio methods, Rittweger et al. calculate the influence of the electron-phonon interaction on transport-related properties such as coupling strength, linewidth and relaxation time in this electron-phonon driven material.
(a) Fermi surface of Pb showing the k-dependent electron–phonon relaxation times Tk at T = 300 K superimposed onto the two sheets of the Fermi surface. Tk is obtained by the solution of the Boltzmann equation within the relaxation time approximation. The relaxation time is almost doubled in the inner sheet (B1) indicating a less efficient electron–phonon coupling compared to the outer sheet (B2). Tk in P1 and P2 is about 4.60 fs and 3.27 fs, respectively. (b) Fermi surface with the superimposed Fermi velocities. Taken from F Rittweger et al 2017 J. Phys.: Condens. Matter 29 355501 © Copyright 2017 IOP Publishing.
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Categories: Journal of Physics: Condensed Matter, JPhys+