Proposal for Plasmon Spectroscopy of Fluctuations in Low-Dimensional Superconductors
| Autor: | Ivan Savenko, V. M. Kovalev |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Electromagnetic field
Superconductivity Physics Physics - Instrumentation and Detectors Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Scattering Condensed Matter - Superconductivity FOS: Physical sciences Physics::Optics General Physics and Astronomy Instrumentation and Detectors (physics.ins-det) Electron 01 natural sciences Superconductivity (cond-mat.supr-con) Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Surface plasmon resonance Electric current Cooper pair 010306 general physics Plasmon Optics (physics.optics) Physics - Optics |
| Zdroj: | Physical Review Letters. 124 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.124.207002 |
| Popis: | We propose to employ an optical spectroscopy technique to monitor the superconductivity and properties of superconductors in the fluctuating regime. This technique is operational close to the plasmon resonance frequency of the material, and it intimately connects with the superconducting fluctuations slightly above the critical temperature $T_c$. We find the Aslamazov-Larkin corrections to AC linear and DC nonlinear electric currents in a generic two-dimensional system exposed to an external longitudinal electromagnetic field. First, we study the plasmon resonance of normal electrons near $T_c$, taking into account their interaction with superconducting fluctuations, and show that fluctuating Cooper pairs reveal a redshift of the plasmon dispersion and an additional mechanism of plasmon scattering, which surpasses both the electron-impurity and the Landau dampings. Second, we demonstrate the emergence of a drag effect of superconducting fluctuations by the external field resulting in considerable, experimentally measurable corrections to the electric current in the vicinity of the plasmon resonance. Manuscript: 6 pages (main text), 2 figures, and Supplemental Material. Published in Phys. Rev. Letters |
| Databáze: | OpenAIRE |
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