Nodal quasiparticle meltdown in ultra-high resolution pump-probe angle-resolved photoemission
| Autor: | Alessandra Lanzara, Christopher L. Smallwood, Jeff Graf, Dung-Hai Lee, Robert A. Kaindl, Chris Jozwiak, Hiroshi Eisaki |
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| Rok vydání: | 2011 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Superconductivity Near-infrared spectroscopy General Physics and Astronomy FOS: Physical sciences Pump probe Pulse (physics) Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons Ultrahigh resolution Condensed Matter::Superconductivity Node (physics) Quasiparticle Condensed Matter::Strongly Correlated Electrons Atomic physics Excitation |
| DOI: | 10.48550/arxiv.1107.5021 |
| Popis: | High-$T_c$ cuprate superconductors are characterized by a strong momentum-dependent anisotropy between the low energy excitations along the Brillouin zone diagonal (nodal direction) and those along the Brillouin zone face (antinodal direction). Most obvious is the d-wave superconducting gap, with the largest magnitude found in the antinodal direction and no gap in the nodal direction. Additionally, while antinodal quasiparticle excitations appear only below $T_c$, superconductivity is thought to be indifferent to nodal excitations as they are regarded robust and insensitive to $T_c$. Here we reveal an unexpected tie between nodal quasiparticles and superconductivity using high resolution time- and angle-resolved photoemission on optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$. We observe a suppression of the nodal quasiparticle spectral weight following pump laser excitation and measure its recovery dynamics. This suppression is dramatically enhanced in the superconducting state. These results reduce the nodal-antinodal dichotomy and challenge the conventional view of nodal excitation neutrality in superconductivity. Comment: 7 pages, 3 figure. To be published in Nature Physics |
| Databáze: | OpenAIRE |
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