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arXiv 1806.04039cond-mat.quant-gascond-mat.str-elquant-ph
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超冷碱土原子的非厄米近藤效应

Non-Hermitian Kondo effect in ultracold alkaline-earth atoms

Masaya Nakagawa, Norio Kawakami, Masahito Ueda

摘要:

我们研究了开放量子系统中的近藤效应,其动机是最近的实验与超冷碱土(类)原子。由于存在非弹性碰撞和相关的原子损失,该系统由复值近藤相互作用描述,并提供了近藤问题的非厄米特扩展。我们发现,非厄米诱导反常逆转的重整化群流违反$g$ -定理,由于非么正性,并产生一个量子相变独特的非厄米。此外,我们使用推广的Bethe近似方法精确求解了非厄米的近藤哈密顿量,并找到了与重整化群流一致的临界线。

英文摘要:

We investigate the Kondo effect in an open quantum system, motivated by recent experiments with ultracold alkaline-earth(-like) atoms. Because of inelastic collisions and the associated atom losses, this system is described by a complex-valued Kondo interaction and provides a non-Hermitian extension of the Kondo problem. We show that the non-Hermiticity induces anomalous reversion of renormalization-group flows which violate the $g$-theorem due to non-unitarity and produce a quantum phase transition unique to non-Hermiticity. Furthermore, we exactly solve the non-Hermitian Kondo Hamiltonian using a generalized Bethe ansatz method and find the critical line consistent with the renormalization-group flow.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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