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APS » Journals » Phys. Rev. B » Volume 72 » Issue 6
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Phys. Rev. B 72, 060510(R) (2005) [4 pages]

Dynamics of Cooper pair formation in Bi2Sr2CaCu2O8+δ

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Robert A. Kaindl, Marc A. Carnahan, and Daniel S. Chemla
Department of Physics, University of California, Berkeley, California 94720, USA
and Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Seongshik Oh* and James N. Eckstein
Department of Physics, University of Illinois, Urbana, Illinois 61801, USA

Received 13 July 2005; published 25 August 2005

We report ultrafast measurements of the transient terahertz conductivity in the high-TC superconductor Bi2Sr2CaCu2O8+δ. After depletion of the superconducting condensate by optical excitation, the ensuing dynamics is tracked with high sensitivity at various excitation densities and temperatures. We measure low-energy spectra and shapes of decay that demonstrate a bimolecular kinetics of condensate formation on a picosecond time scale and yield a measure of quasiparticle interactions hidden in linear spectroscopy.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.060510
DOI:
10.1103/PhysRevB.72.060510
PACS:
74.25.Gz, 74.40.+k, 74.72.Hs, 78.47.+p

*Present address: National Institute of Standards and Technology, Boulder, CO 80305.

 
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