Dynamical Cooper pairing in nonequilibrium electron-phonon systems

被引：123
|
作者：
Knap, Michael [1 ,2 ]
Babadi, Mehrtash [3 ]
Refael, Gil [3 ]
Martin, Ivar [4 ]
Demler, Eugene [5 ]
机构：
[1] Tech Univ Munich, Dept Phys, Walter Schottky Inst, D-85748 Garching, Germany
[2] Tech Univ Munich, Inst Adv Study, D-85748 Garching, Germany
[3] CALTECH, Inst Quantum Informat & Matter, Pasadena, CA 91125 USA
[4] Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA
[5] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
来源：
PHYSICAL REVIEW B | 2016年 / 94卷 / 21期
基金：
美国国家科学基金会;
关键词：
LIGHT-INDUCED SUPERCONDUCTIVITY; DENSITY-WAVE; ULTRAFAST; BEHAVIOR; DRIVEN; PHASE; ORDER;
D O I：
10.1103/PhysRevB.94.214504
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We analyze Cooper pairing instabilities in strongly driven electron-phonon systems. The light-induced nonequilibrium state of phonons results in a simultaneous increase of the superconducting coupling constant and the electron scattering. We demonstrate that the competition between these effects leads to an enhanced superconducting transition temperature in a broad range of parameters. Our results may explain the observed transient enhancement of superconductivity in several classes of materials upon irradiation with high intensity pulses of terahertz light, and may pave newways for engineering high-temperature light-induced superconducting states.
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页数：13
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