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The effects of electron-phonon interactions on bandgaps

Hague, James (2011). The effects of electron-phonon interactions on bandgaps. Journal of Physics: Conference Series, 286 012032.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1088/1742-6596/286/1/012032
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Abstract

I compute the spectral functions of a 1D Holstein polaron moving in a modulated potential, to examine the effects of electron-phonon interactions on band gaps. The imaginary time Green function is computed using diagrammatic quantum Monte Carlo, which exactly sums the diagrammatic series. From the imaginary time Green function, spectral functions are computed. The electron-phonon interaction flattens the electronic dispersion and leads to an increase in the gap at momentum k = π/2. At strong coupling, polaron sidebands form in the gap. These results demonstrate the strong effect that electron-phonon interactions can have on band gaps.


Item Type: Journal Article
Copyright Holders: 2011 The Author
ISSN: 1742-6596
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetEPSRC (Engineering and Physical Sciences Research Council)
Extra Information: CMMP 2010, 14-16 December 2010, Warwick
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Biomedical Research Network (BRN)
Related URLs:
Item ID: 30281
Depositing User: James Hague
Date Deposited: 02 Dec 2011 10:22
Last Modified: 07 Mar 2014 13:48
URI: http://oro.open.ac.uk/id/eprint/30281
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