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

Andreas P. Schnyder, Dirk Manske, and Adolfo Avella
Phys. Rev. B 84, 214513 – Published 9 December 2011

Abstract

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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  • Received 14 September 2011

DOI:https://doi.org/10.1103/PhysRevB.84.214513

©2011 American Physical Society

Authors & Affiliations

Andreas P. Schnyder1,*, Dirk Manske1, and Adolfo Avella1,2,3,†

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 2Dipartimento di Fisica “E.R. Caianiello” - Unità CNISM di Salerno, Università degli Studi di Salerno, I-84084 Fisciano (SA), Italy
  • 3CNR-SPIN, UoS di Salerno, I-84084 Fisciano (SA), Italy

  • *a.schnyder@fkf.mpg.de
  • avella@physics.unisa.it

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Issue

Vol. 84, Iss. 21 — 1 December 2011

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