Electronic and fluctuation dynamics following a quench to the superconducting phase

Electronic and fluctuation dynamics following a quench to the superconducting phase
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超导相失超后的电子和涨落动力学

DOI:
10.1103/physrevb.103.035116
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
Martin Eckstein
Martin Eckstein
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Christopher Stahl;Martin Eckstein

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本文研究了三维Hubbard模型中超导涨落的动力学性质,讨论了超导涨落从无序态到有序态的猝灭过程。虽然长时间的演化是很好地理解的耗散时间依赖的金兹伯格-朗道模型与不稳定的潜力,早期的要求更高,由于不可分割的动力学的配对波动和电子准粒子。我们的模拟使用随时间变化的波动交换近似对待两个自由度在同一个立足点,并揭示了一个非热电子制度造成的非单调增长的波动。这一特征并没有被金兹伯格-朗道理论直接捕捉到,但在电子的热化时间之后仍然可以观察到。我们进一步探讨了如何增长的序参数波动导致的电子光谱中的赝隙的开放,并确定Andreev反射背后的差距开放的主导机制。
We investigate the dynamics of superconducting fluctuations in the attractive three-dimensional Hubbard model after a quench from the disordered phase to the ordered regime. While the long-time evolution is well understood in terms of dissipative time-dependent Ginzburg-Landau models with unstable potentials, early times are more demanding due to the inseparable dynamics of the pairing fluctuations and the electronic quasiparticles. Our simulation using the time-dependent fluctuation exchange approximation treats both degrees of freedom on the same footing and reveals a nonthermal electronic regime causing a nonmonotonous growth of the fluctuations. This feature is not directly captured by the Ginzburg-Landau theory but nevertheless remains observable beyond the thermalization time of the electrons. We further explore how the growth of the order parameter fluctuations leads to an opening of a pseudogap in the electronic spectrum and identify Andreev reflections as the dominant mechanism behind the gap opening.
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