Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session J41: Response to Electromagnetic Fields (Optical, Raman)
11:15 AM–2:15 PM,
Tuesday, March 16, 2010
Sponsoring Unit: DMP
Chair: Oleg Shpyrko, University of California, San Diego
Abstract ID: BAPS.2010.MAR.J41.7
Abstract: J41.00007 : Optical conductivity from cluster DMFT: Formalism and application to high-Tc superconductors*
12:27 PM–12:39 PM
Preview Abstract Abstract
The optical conductivity of the one-band Hubbard model is calculated using the ``dynamical cluster approximation'' implementation of dynamical mean field theory for parameters appropriate to high-temperature copper-oxide superconductors. We present a scheme for obtaining the vertex corrections and show their significant contributions especially to the conductivity of undoped and lightly doped materials where it strongly affects the above-gap absorption. For parameters $U=9t$ and $t'=-0.3t$ relevant to high temperature superconductors, at densities of one electron per site an insulating state is found with a gap $\sim$ 1.8eV similar in magnitude to that observed in La$_2$CuO$_4$. On doping, the gap is rapidly destabilized and absorption appears at low frequencies, again in a manner consistent with the measurements. The mid-infrared feature observed at intermediate dopings is shown to arise from a pseudogap structure in the density of states.
*This work is supported by NSF-DMR-0705847.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.J41.7
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