Coupling of a high-energy excitation to superconducting quasiparticles in a cuprate from Coherent Charge Fluctuation Spectroscopy

Autor:	Mansart, B., Lorenzana, J., Mann, A., Odeh, A., Scarongella, M., Chergui, M., Carbone, F.
Rok vydání:	2011
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
Popis:	Dynamical information on spin degrees of freedom of proteins or solids can be obtained by Nuclear Magnetic Resonance (NMR) and Electron Spin Resonance (ESR). A technique with similar versatility for charge degrees of freedom and their ultrafast correlations could move forward the understanding of systems like unconventional superconductors. By perturbing the superconducting state in a high-Tc cuprate using a femtosecond laser pulse, we generate coherent oscillations of the Cooper pair condensate which can be described by an NMR/ESR formalism. The oscillations are detected by transient broad-band reflectivity and found to resonate at the typical scale of Mott physics (2.6 eV), suggesting the existence of a non-retarded contribution to the pairing interaction, as in unconventional (non Migdal-Eliashberg) theories. Comment: Accepted for publication in the Proceedings of the National Academy of Sciences of the U.S.A. (PNAS)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1112.0737 Zobrazit plný text záznamu View this record from Arxiv