Unusual metallic phase in a chain of strongly interacting particles

Abstract

We consider a one-dimensional lattice model with the nearest-neighbor interaction $V_1$ and the next-nearest neighbor interaction $V_2$ 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 $V_1$ and $V_2$ along the line $V_1-2V_2=\gamma J$, where $J$ is the hopping amplitude, and $\gamma \approx 1.2$. We think that close to this line the system is a ``weak'' metal in a sense that the flux sensitivity decreases with the size of the system not exponentially but as $1/L^{\alpha }$ with $\alpha >1$.

To appear in J. Phys. C; 9 revtex preprint pages + 4 ps figures, uuencoded

References in corpus (1)

• Insulator-Metal Transition in One Dimension Induced by Long-Range Electronic Interactions

Cited by in corpus (3)

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• Fermionic phases and their transitions induced by competing finite-range interactions