Transient Dynamics of d-Wave Superconductors after a Sudden Excitation

Francesco Peronaci, International School for Advanced Studies (SISSA), Trieste, Italy
Event Date and Time: 
Thu, 2016-04-21 14:00 - 15:00
Hennings 318
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Ilya Elfimov
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Motivated by recent ultrafast 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 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, we find an analytical expression for the reduction of spectral weight close to the nodes, in qualitative agreement with the experimental results.


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[3]  C. L. Smallwood, W. Zhang, T. L. Miller, C. Jozwiak, H. Eisaki, D-H. Lee, and A. Lanzara, Phys. Rev. B 89, 115126 (2014).

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