Faculté des sciences

Femtosecond response of quasiparticles and phonons in superconducting YBa₂Cu₃O7-δ studied by wideband terahertz spectroscopy

Pashkin, A. ; Porer, M. ; Beyer, M. ; Kim, Kyung Wan ; Dubroka, Adam ; Bernhard, Christian ; Yao, X. ; Dagan, Y. ; Hackl, R. ; Erb, A. ; Demsar, J. ; Huber, R. ; Leitenstorfer, A.

In: Physical Review Letters, 2010, vol. 105, no. 6, p. 067001

We measure the anisotropic midinfrared response of electrons and phonons in bulk YBa₂Cu₃O7-δ after femtosecond photoexcitation. A line shape analysis of specific lattice modes reveals their transient occupation and coupling to the superconducting condensate. The apex oxygen vibration is strongly excited within 150 fs, demonstrating that the lattice absorbs a major portion of the... Plus

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    Summary
    We measure the anisotropic midinfrared response of electrons and phonons in bulk YBa₂Cu₃O7-δ after femtosecond photoexcitation. A line shape analysis of specific lattice modes reveals their transient occupation and coupling to the superconducting condensate. The apex oxygen vibration is strongly excited within 150 fs, demonstrating that the lattice absorbs a major portion of the pump energy before the quasiparticles are thermalized. Our results attest to substantial electron-phonon scattering and introduce a powerful concept probing electron-lattice interactions in a variety of complex materials.