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V2O5, a Strongly Correlated 2D System with 1D Aspects – Walter Lambrecht

Date: Mon. March 30th, 2015, 12:30 pm-1:30 pm
Location: Rockefeller 221

V2O5 is a layered material with chains within the layer. I will discuss how this is manifested in its electronic band structure. The quasiparticle self-consistent GW method in this material strongly overestimates the band gap. The main reasons for this are examined and found to be a lattice polarization contribution to the screening of the electron-electron interaction. This is related to the large LO/TO phonon splittings in this material. Changes in band structure and phonons between bulk and monolayer will be discussed.

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