Charge transport in the Hubbard model at high temperatures: Triangular versus square lattice

High-temperature bad-metal transport has been recently studied both theoretically and in experiments as one of the key signatures of strong electronic correlations. Here we use the dynamical mean field theory and its cluster extensions, as well as the finite-temperature Lanczos method to explore the...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B 2020-09, Vol.102 (11), p.1, Article 115142
Main Authors: Vranić, A., Vučičević, J., Kokalj, J., Skolimowski, J., Žitko, R., Mravlje, J., Tanasković, D.
Format: Article
Language:English
Subjects:
Charge transport
Doping
High temperature
Lattices
Mean field theory
Size effects
Temperature
Temperature dependence
Transport properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:High-temperature bad-metal transport has been recently studied both theoretically and in experiments as one of the key signatures of strong electronic correlations. Here we use the dynamical mean field theory and its cluster extensions, as well as the finite-temperature Lanczos method to explore the influence of lattice frustration on the thermodynamic and transport properties of the Hubbard model at high temperatures. We consider the triangular and the square lattices at half-filling and at 15% hole doping. We find that for T ≳ 1.5t the self-energy becomes practically local, while the finite-size effects become small at lattice size 4 × 4 for both lattice types and doping levels. The vertex corrections to optical conductivity, which are significant on the square lattice even at high temperatures, contribute less on the triangular lattice. We find approximately linear temperature dependence of dc resistivity in doped Mott insulator for both types of lattices.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.115142