Transient Dynamics of d-Wave Superconductors after a Sudden Excitation
16:00 - 17:00
International School for Advanced Studies (SISSA), Trieste, Italy
CFEL (Bldg. 99)
Seminar Room IV, O1.111
In this talk I will discuss the transient dynamics of a d-wave BCS model after a quantum quench of the interaction parameter. The motivation comes from recent ultrafast pump-probe experiments on high-temperature superconductors.
It is found that the existence of gap nodes, with the associated nodal quasiparticles, introduces a decay channel which makes the dynamics much faster than in the conventional s-wave model. For every value of the quench parameter, the superconducting gap rapidly converges to a stationary value smaller than the one at equilibrium. Using a sudden approximation for the gap dynamics, one finds an analytical expression for the reduction of spectral weight close to the nodes, in qualitative agreement with the experimental results.
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Lett. 115, 257001 (2015).
 J. Graf, C. Jozwiak, C. L. Smallwood, H. Eisaki,
R. A. Kaindl, D-H. Lee, and A. Lanzara, Nature Physics 7, 805–809 (2011).