Interacting particles at a metal-insulator transition

Details Interacting particles at a metal-insulator transition Interacting particles at a metal-insulator transition

2001-02-14

arxiv.org/abs/cond-mat/0102251v2

Phys. Rev. B 65, 115114 (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages, 8 figures The original paper was splitted and rewritten. This is the published version of the DMRG part of the origin

Scientific paper

10.1103/PhysRevB.65.115114

We study the influence of many-particle interaction in a system which, in the single particle case, exhibits a metal-insulator transition induced by a finite amount of onsite pontential fluctuations. Thereby, we consider the problem of interacting particles in the one-dimensional quasiperiodic Aubry-Andre chain. We employ the density-matrix renormalization scheme to investigate the finite particle density situation. In the case of incommensurate densities, the expected transition from the single-particle analysis is reproduced. Generally speaking, interaction does not alter the incommensurate transition. For commensurate densities, we map out the entire phase diagram and find that the transition into a metallic state occurs for attractive interactions and infinite small fluctuations -- in contrast to the case of incommensurate densities. Our results for commensurate densities also show agreement with a recent analytic renormalization group approach.

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