Theory of light-enhanced phonon-mediated superconductivity
Theory of light-enhanced phonon-mediated superconductivity
复制标题
光增强声子介导的超导理论
DOI：
10.1103/physrevb.93.144506
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发表时间：
2016
影响因子：
3.7
通讯作者：
C. Kollath
中科院分区：
文献类型：
--
作者：
M. A. Sentef;A. F. Kemper;A. Georges;C. Kollath
我们研究了声子介导的超导体被驱动出平衡态的动力学。电子跳跃幅度随时间斜降，导致电子态密度增加。通过求解双时间Keldysh绿色函数的Migdal-Eliashberg方程，研究了耦合电子-声子模型的动力学性质.当系统在相同温度下热化到新态时，费米能级附近态密度的增加导致超导电性的增强。我们提供了一个时间和动量解决这个热化过程的观点，并表明它涉及到快速的过程与单粒子散射和慢得多的动力学与超导序参数。论证了电子-声子耦合对于快速增强和有效热化超导电性的重要性，并将结果与BCS含时平均场近似进行了比较。
We investigate the dynamics of a phonon-mediated superconductor driven out of equilibrium. The electronic hopping amplitude is ramped down in time, resulting in an increased electronic density of states. The dynamics of the coupled electron-phonon model is investigated by solving Migdal-Eliashberg equations for the double-time Keldysh Green's functions. The increase of the density of states near the Fermi level leads to an enhancement of superconductivity when the system thermalizes to the new state at the same temperature. We provide a time- and momentum-resolved view on this thermalization process and show that it involves fast processes associated with single-particle scattering and much slower dynamics associated with the superconducting order parameter. The importance of electron-phonon coupling for the rapid enhancement and the efficient thermalization of superconductivity is demonstrated, and the results are compared to a BCS time-dependent mean-field approximation.
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影响因子：
64.8
作者：
Mitrano M;Cantaluppi A;Nicoletti D;Kaiser S;Perucchi A;Lupi S;Di Pietro P;Pontiroli D;Riccò M;Clark SR;Jaksch D;Cavalleri A
通讯作者：
Cavalleri A
影响因子：
16.6
作者：
Hellmann, S.;Rohwer, T.;Rossnagel, K.
通讯作者：
Rossnagel, K.
影响因子：
64.8
作者：
Mankowsky, R.;Subedi, A.;Cavalleri, A.
通讯作者：
Cavalleri, A.
影响因子：
56.9
作者：
Fausti, D.;Tobey, R. I.;Cavalleri, A.
通讯作者：
Cavalleri, A.