Transient Dynamics of d-Wave Superconductors after a Sudden Excitation

Speaker: 
Francesco Peronaci, International School for Advanced Studies (SISSA), Trieste, Italy
Event Date and Time: 
Thu, 2016-04-21 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Ilya Elfimov
Intended Audience: 
Graduate

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.

References

[1]  F. Peronaci, M. Schiro and M. Capone, Phys. Rev. Lett. 115, 257001 (2015).

[2]  J. Graf, C. Jozwiak, C. L. Smallwood, H. Eisaki, R. A. Kaindl, D-H. Lee, and A. Lanzara, Nature Physics 7, 805 (2011).

[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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