Breakdown of the Mott insulator: Exact solution of an asymmetric Hubbard model
Breakdown of the Mott insulator: Exact solution of an asymmetric Hubbard model
复制标题
莫特绝缘体的击穿：非对称哈伯德模型的精确解
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
N. Kawakami
中科院分区：
文献类型：
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作者：
T. Fukui;N. Kawakami
研究了在系统中引入耗散隧穿时Mott绝缘体的击穿。通过精确求解一维非对称Hubbard模型，我们展示了Mott绝缘体的击穿是如何发生的。随着隧穿效应的增强，Hubbard带隙单调减小并最终消失，导致绝缘体-金属转变。我们讨论了这种量子相变的起源与最近研究的其他非厄米系统相比。
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.