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Smallwood CL, Hinton JP, Jozwiak C, et al. Tracking Cooper pairs in a cuprate superconductor by ultrafast angle-resolved photoemission. Science. 2012;336(6085):1137-9doi: 10.1126/science.1217423.
Smallwood, C. L., Hinton, J. P., Jozwiak, C., Zhang, W., Koralek, J. D., Eisaki, H., Lee, D. H., Orenstein, J., & Lanzara, A. (2012). Tracking Cooper pairs in a cuprate superconductor by ultrafast angle-resolved photoemission. Science (New York, N.Y.), 336(6085), 1137-9. https://doi.org/10.1126/science.1217423
Smallwood, Christopher L, et al. "Tracking Cooper pairs in a cuprate superconductor by ultrafast angle-resolved photoemission." Science (New York, N.Y.) vol. 336,6085 (2012): 1137-9. doi: https://doi.org/10.1126/science.1217423
Smallwood CL, Hinton JP, Jozwiak C, Zhang W, Koralek JD, Eisaki H, Lee DH, Orenstein J, Lanzara A. Tracking Cooper pairs in a cuprate superconductor by ultrafast angle-resolved photoemission. Science. 2012 Jun 01;336(6085):1137-9. doi: 10.1126/science.1217423. PMID: 22654053.
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Science. 2012 Jun 01;336(6085):1137-9. doi: 10.1126/science.1217423.

Tracking Cooper pairs in a cuprate superconductor by ultrafast angle-resolved photoemission.

Science (New York, N.Y.)

Christopher L Smallwood, James P Hinton, Christopher Jozwiak, Wentao Zhang, Jake D Koralek, Hiroshi Eisaki, Dung-Hai Lee, Joseph Orenstein, Alessandra Lanzara

Affiliations

  1. Department of Physics, University of California, Berkeley, CA 94720, USA.

PMID: 22654053 DOI: 10.1126/science.1217423

Abstract

In high-temperature superconductivity, the process that leads to the formation of Cooper pairs, the fundamental charge carriers in any superconductor, remains mysterious. We used a femtosecond laser pump pulse to perturb superconducting Bi(2)Sr(2)CaCu(2)O(8+δ) and studied subsequent dynamics using time- and angle-resolved photoemission and infrared reflectivity probes. Gap and quasiparticle population dynamics revealed marked dependencies on both excitation density and crystal momentum. Close to the d-wave nodes, the superconducting gap was sensitive to the pump intensity, and Cooper pairs recombined slowly. Far from the nodes, pumping affected the gap only weakly, and recombination processes were faster. These results demonstrate a new window into the dynamical processes that govern quasiparticle recombination and gap formation in cuprates.

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