Breakdown of the Mott insulator: Exact solution of an asymmetric Hubbard model

Details Breakdown of the Mott insulator: Exact solution of an asymmetric Hubbard model Breakdown of the Mott insulator: Exact solution of an asymmetric Hubbard model

1998-06-02

arxiv.org/abs/cond-mat/9806023v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, revtex

Scientific paper

10.1103/PhysRevB.58.16051

The breakdown of the Mott insulator is studied when the dissipative tunneling into the environment is introduced to the system. By exactly solving the one-dimensional asymmetric Hubbard model, we show how such a breakdown of the Mott insulator occurs. As the effect of the tunneling is increased, the Hubbard gap is monotonically decreased and finally disappears, resulting in the insulator-metal transition. We discuss the origin of this quantum phase transition in comparison with other non-Hermitian systems recently studied.

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