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arXiv 1506.01409cond-mat.supr-con
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d波超导体突加激励后的瞬态动力学

Transient Dynamics of d-wave Superconductors after a Sudden Excitation

Francesco Peronaci, Marco Schirò, Massimo Capone

摘要:

受最近高温超导体的超快泵浦探测实验的启发,我们讨论了相互作用参数量子猝灭后d波BCS模型的瞬态动力学。我们发现,间隙节点的存在,与相关的节点准粒子,引入了耗散通道,使动力学比传统的s波模型快得多。对于失超参数的每一个值,超导能隙迅速收敛到一个小于平衡态的稳定值。使用间隙动力学的突然近似,我们找到了一个解析表达式的光谱重量减少接近节点,这是在定性与最近的实验。

英文摘要:

Motivated by recent ultafast pump probe experiments on high-temperature superconductors, we discuss the transient dynamics of a d-wave BCS model after a quantum quench of the interaction parameter. We find that the existence of gap nodes, with the associated nodal quasiparticles, introduces a dissipation channel which makes the dynamics much faster than in the conventional s-wave model. For every value of the quench parameters, the superconducting gap rapidly converges to a stationary value smaller than the one at equilibrium. Using a sudden approximation for the gap dynamics, we find an analytical expression for the reduction of spectral weight close to the nodes, which is in qualitative agreement with recent experiments.

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