Hubbard model on an anisotropic checkerboard lattice at finite temperatures: Magnetic and metal-insulator transitions

doi:10.1088/1674-1056/ab4279

Abstract

We study magnetic and Mott transitions of the Hubbard model on the geometrically frustrated anisotropic checkerboard lattice at half filling using cellular dynamical mean-field theory. Phase diagrams over a wide area of the parameter space are obtained by varying the interparticle interaction strength, geometric frustration strength, and temperature. Our results show that frustration and thermal fluctuations play a competing role against the interactions and in general favor a metallic phase without antiferromagnetic order. Due to their interplay, the system exhibits competition between antiferromagnetic insulator, antiferromagnetic metal, paramagnetic insulator, and paramagnetic metal phases in the intermediate-interaction regime. In the strong-interaction limit, which reduces to the Heisenberg model, our result is consistent with previous studies.

Keywords: geometrical frustration checkerboard lattice Hubbard model

Received: 11 June 2019
Revised: 05 August 2019
Accepted manuscript online:

PACS:	71.10.-w	(Theories and models of many-electron systems)
	05.30.Rt	(Quantum phase transitions)
	71.10.Fd	(Lattice fermion models (Hubbard model, etc.))

Corresponding Authors: Hai-Di Liu
E-mail: hdliu@wipm.ac.cn

Cite this article:

Hai-Di Liu(刘海迪) Hubbard model on an anisotropic checkerboard lattice at finite temperatures: Magnetic and metal-insulator transitions 2019 Chin. Phys. B 28 107102

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Hubbard model on an anisotropic checkerboard lattice at finite temperatures: Magnetic and metal-insulator transitions

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