Metal-insulator transition in the hubbard model on a triangular lattice

Jayaprakash, C. ; Krishnamurthy, H. R. ; Sarker, S. ; Wenzel, W. (1991) Metal-insulator transition in the hubbard model on a triangular lattice Europhysics Letters, 15 (6). pp. 625-630. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/15/6/011

Related URL: http://dx.doi.org/10.1209/0295-5075/15/6/011

Abstract

We discuss the results of an extensive mean-field investigation of the half-filled Hubbard model on a triangular lattice at zero temperature. At intermediate U we find a first-order metal-insulator transition from an incommensurate spiral magnetic metal to a semiconducting state with a commensurate linear spin density wave ordering stabilized by the competition between the kinetic energy and the frustrated nature of the magnetic interaction. At large U the ground state is that of a classical triangular antiferromagnet within our approximation. In the incommensurate spiral metallic phase the Fermi surface has parts in which the wave function renormalization Z is extremely small. The evolution of the Fermi surface and the broadening of the quasi-particle band along with the variation of the plasma frequency and a charge stiffness constant with U/t are discussed.

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