Resonant generation of coherent phonons in a superconductor by ultrafast optical pump pulses

Details Resonant generation of coherent phonons in a superconductor by ultrafast optical pump pulses Resonant generation of coherent phonons in a superconductor by ultrafast optical pump pulses

2011-09-14

arxiv.org/abs/1109.3112v2

Phys. Rev. B 84, 214513 (2011)

Physics

Condensed Matter

Superconductivity

8 pages, 4 figures, typos corrected

Scientific paper

10.1103/PhysRevB.84.214513

We study the generation of coherent phonons in a superconductor by ultrafast optical pump pulses. The nonequilibrium dynamics of the coupled Bogoliubov quasiparticle-phonon system after excitation with the pump pulse is analyzed by means of the density-matrix formalism with the phonons treated at a full quantum kinetic level. For ultrashort excitation pulses, the superconductor exhibits a nonadiabatic behavior in which the superconducting order parameter oscillates. We find that in this nonadiabatic regime the generation of coherent phonons is resonantly enhanced when the frequency of the order-parameter oscillation is tuned to the phonon energy, a condition that can be achieved in experiments by varying the integrated pump pulse intensity.

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