2021/03/02 by Naoto Tsuji, Masaya Nakagawa, Tsuji, Naoto +3 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Chemical Physics Studies #FOS: Physical sciences #High-pressure geophysics and materials #Quantum, superfluid, helium dynamics #Statistical Mechanics (cond-mat.stat-mech) #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2103.01547
openalex publication_date 2021/03/02 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
Cooper pairs featuring a nonzero center-of-mass crystal momentum \boldsymbol Q=(π,π, …) and an off-diagonal long-range order (η-pairing states) constitute exact eigenstates of a Hubbard model [C. N. Yang, Phys. Rev. Lett. 63, 2144 (1989)]. Here we show that the η-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 η-pairing states. The decay of the η-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.