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: https://doi.org/10.1088/1742-6596/286/1/012032

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.

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About

• Item ORO ID
• 30281
• Item Type
• Journal Item
• ISSN
• 1742-6596
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	Not Set	EPSRC (Engineering and Physical Sciences Research Council)

• Extra Information
• CMMP 2010, 14-16 December 2010, Warwick
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Research Group
• Physics
• Copyright Holders
• © 2011 The Author
• Related URLs
• • http://iopscience.iop.org/1742-6596/286/...(Other)
  • http://cmmp10.iopconfs.org/(Other)
  • http://cmmp10.iopconfs.org/file_41710.pd...(Other)
• Depositing User
• James Hague