Publications

An unusual metallic phase in a chain of strongly interacting particles

E.V. Tsiper and A.L. Efros

Department of Physics, University of Utah, Salt Lake City, UT 84112

We consider a one-dimensional lattice model with the nearest-neighbour interaction V₁ and the next-nearest-neighbour interaction V₂ with filling factor 1/2 at zero temperature. The particles are assumed to be spinless fermions or hard-core bosons. Using very-simple assumptions we are able to predict the basic structure of the insulator-metal phase diagram for this model. Computations of the flux sensitivity support the main features of the proposed diagram and show that the system maintains metallic properties at arbitrarily large values of V₁ and V₂ along the line V₁ - 2 V₂ = &gamma J, where J is the hopping amplitude, and gamma approximate to 1.2. We think that close to this line the system is a 'weak' metal in the sense that the flux sensitivity decreases with the size of the system not exponentially but as 1/L^&alpha with &alpha > 1.

J. Phys.: Cond. Matt. (Letter) 9, L561-L567 (1997)
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