Tachyonic and Plasma Instabilities of $\eta$-Pairing States Coupled to Electromagnetic Fields.

Tachyonic and Plasma Instabilities of $\eta$-Pairing States Coupled to Electromagnetic Fields.
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与电磁场耦合的 $eta$ 配对态的快子和等离子体不稳定性。

DOI:
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发表时间:
2021
期刊:
arXiv: Superconductivity
影响因子:
--
通讯作者:
Masahito Ueda
Masahito Ueda
中科院分区:
--
文献类型:
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作者:
N. Tsuji;Masaya Nakagawa;Masahito Ueda

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库珀对具有非零的质心晶体动量${\boldsymbol Q}=(\pi,\pi,\dots)$和非对角长程有序($\eta$-配对态)构成了Hubbard模型的精确本征态[C. N. Yang,Phys. Rev. Lett. 63,2144(1989)]。在这里,我们表明,$\eta$配对状态呈现动态不稳定,通过耦合到动态电磁场。不稳定性是由“快子”电磁场和不稳定的等离子体模式的吸引力和排斥力的相互作用,分别。的不稳定性的增长的典型的时间尺度是飞秒的顺序,在固体中的电子系统,这将严格的约束上的寿命的$\eta$-配对状态。的$\eta$-配对状态的衰减导致增强的光发射的频率从哈伯德相互作用强度的排斥的情况下和未衰减的电磁穿透的吸引力的情况下。
Cooper pairs featuring a nonzero center-of-mass crystal momentum ${\boldsymbol Q}=(\pi,\pi, \dots)$ and an off-diagonal long-range order ($\eta$-pairing states) constitute exact eigenstates of a Hubbard model [C. N. Yang, Phys. Rev. Lett. 63, 2144 (1989)]. Here we show that the $\eta$-pairing states are rendered dynamically unstable via coupling to dynamical electromagnetic fields. The instability is caused by "tachyonic" electromagnetic fields and unstable plasma modes for attractive and repulsive interactions, respectively. The typical time scale of the growth of the instability is of the order of femtoseconds for electron systems in solids, which places a strict bound on the lifetime of the $\eta$-pairing states. The decay of the $\eta$-pairing states leads to enhanced light emission with frequencies shifted from the Hubbard interaction strength for the repulsive case and unattenuated electromagnetic penetration for the attractive case.
活性物质中的埃尔米特和非埃尔米特拓扑现象,
DOI: --
发表时间: 2022
期刊:
影响因子: --
作者:
増木貫太;蘆田祐人;Y. Ashida;Y. Ashida
通讯作者: Y. Ashida