Breakdown of the Mott insulator: Exact solution of an asymmetric Hubbard model
- 15 December 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 58 (24) , 16051-16056
- https://doi.org/10.1103/physrevb.58.16051
Abstract
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.Keywords
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