Strong coupling theory of the spinless charges on the triangular lattices: possibility of a new quantum liquid

Details Strong coupling theory of the spinless charges on the triangular lattices: possibility of a new quantum liquid Strong coupling theory of the spinless charges on the triangular lattices: possibility of a new quantum liquid

2006-05-02

arxiv.org/abs/cond-mat/0605045v1

Physics

Condensed Matter

Strongly Correlated Electrons

4pages, 7figures

Scientific paper

10.1103/PhysRevB.74.193107

We propose a new type of charge liquid state in the spinless fermion system on a triangular lattice under strong inter-site Coulomb interactions, $V$. In the strong coupling limit ($t=0$), the ground state is classical and disordered due to geometrical frustration. The introduction of small t will drive the system to a partially ordered phase which we call a "pinball liquid". A possibly long range ordered Wigner crystal solid coexist with a liquid component which are moving around them like a pinball. This liquid is dominant over wide range of filling, even away from the regular triangle, and is also realized in the hard core boson systems. Relevance to the organic theta-ET_2X is discsussed.

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