Back to Search
Start Over
Exact diagonalization study of optical conductivity in two-dimensional Hubbard model
- Publication Year :
- 2005
- Publisher :
- arXiv, 2005.
-
Abstract
- The optical conductivity \sigma(\omega) in the two-dimensional Hubbard model is examined by applying the exact diagonalization technique to small square clusters with periodic boundary conditions up to \sqrt{20} X \sqrt{20} sites. Spectral-weight distributions at half filling and their doping dependence in the 20-site cluster are found to be similar to those in a \sqrt{18} X \sqrt{18} cluster, but different from 4 X 4 results. The results for the 20-site cluster enable us to perform a systematic study of the doping dependence of the spectral-weight transfer from the region of the Mott-gap excitation to lower-energy regions. We discuss the dependence of the Drude weight and the effective carrier number on the electron density at a large on-site Coulomb interaction.<br />Comment: 5 pages, 5 figures
- Subjects :
- Physics
Electron density
Hubbard model
Condensed matter physics
Strongly Correlated Electrons (cond-mat.str-el)
FOS: Physical sciences
Condensed Matter Physics
Optical conductivity
Square (algebra)
Electronic, Optical and Magnetic Materials
Condensed Matter - Strongly Correlated Electrons
Coulomb
Cluster (physics)
Periodic boundary conditions
Condensed Matter::Strongly Correlated Electrons
Boundary value problem
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....92bf0a0037c17ea4e2f3a57607e0bc43
- Full Text :
- https://doi.org/10.48550/arxiv.cond-mat/0505404