Correlated electron states and transport in triangular arrays

Details Correlated electron states and transport in triangular arrays Correlated electron states and transport in triangular arrays

2001-11-19

arxiv.org/abs/cond-mat/0111345v3

Phys. Rev. B 72, 235331 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages, 10 figures

Scientific paper

10.1103/PhysRevB.72.235331

We study correlated electron states in frustrated geometry of a triangular lattice. The interplay of long range interactions and finite residual entropy of a classical system gives rise to unusual effects in equilibrium ordering as well as in transport. A novel correlated fluid phase is identified in a wide range of densities and temperatures above freezing into commensurate solid phases. The charge dynamics in the correlated phase is described in terms of a height field, its fluctuations, and topological defects. We demonstrate that the height field fluctuations give rise to a ``free'' charge flow and finite dc conductivity. We show that freezing into the solid phase, controlled by the long range interactions, manifests itself in singularities of transport properties.

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