Tachyonic and Plasma Instabilities of $\eta$-Pairing States Coupled to Electromagnetic Fields.
Tachyonic and Plasma Instabilities of $\eta$-Pairing States Coupled to Electromagnetic Fields.
复制标题
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:
影响因子:
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通讯作者:
Masahito Ueda
中科院分区:
文献类型:
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作者:
N. Tsuji;Masaya Nakagawa;Masahito Ueda
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.
DOI:
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发表时间:
2022
期刊:
影响因子:
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作者:
増木貫太;蘆田祐人;Y. Ashida;Y. Ashida
通讯作者:
Y. Ashida