We study intersite electron correlations in the half-filled Hubbard model on square lattices with periodic and open boundary conditions by means of a real-space dual fermion approach. By calculating renormalization factors, we clarify that nearest-neighbor intersite correlations already significantly reduce the critical interaction. The Mott transition occurs at U/t ∼ 6.4, where U is the interaction strength and t is the hopping integral. This value is consistent with quantum Monte Carlo results. It shows the importance of short-range intersite correlations, which are taken into account in the framework of the real-space dual fermion approach.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - Feb 5 2016|
|Event||TMU International Symposium on New Quantum Phases Emerging from Novel Crystal Structure - Tokyo, Japan|
Duration: Sep 24 2015 → Sep 25 2015
ASJC Scopus subject areas
- Physics and Astronomy(all)