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Author Anthore, A.; Pothier, H.; Esteve, D.
Title (up) Density of states in a superconductor carrying a supercurrent Type Journal Article
Year 2003 Publication Phys. Rev. Lett. Abbreviated Journal Phys. Rev. Lett.
Volume 90 Issue 12 Pages 127001 (1 to 4)
Keywords Usadel, superconducting nanowire
Abstract We have measured the tunneling density of states (DOS) in a superconductor carrying a supercurrent or exposed to an external magnetic field. The pair correlations are weakened by the supercurrent, leading to a modification of the DOS and to a reduction of the gap. As predicted by the theory of superconductivity in diffusive metals, we find that this effect is similar to that of an external magnetic field.
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Notes Recommended by Klapwijk Approved no
Call Number Serial 924
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Author Novotny, Lukas
Title (up) Effective wavelength scaling for optical antennas Type Journal Article
Year 2007 Publication Phys. Rev. Lett. Abbreviated Journal Phys. Rev. Lett.
Volume 98 Issue 26 Pages 266802(1-4)
Keywords optical antennas
Abstract In antenna theory, antenna parameters are directly related to the wavelength λ of incident radiation, but this scaling fails at optical frequencies where metals behave as strongly coupled plasmas. In this Letter we show that antenna designs can be transferred to the optical frequency regime by replacing λ by a linearly scaled effective wavelength λeff=n1+n2λ/λp, with λp being the plasma wavelength and n1, n2 being coefficients that depend on geometry and material properties. It is assumed that the antenna is made of linear segments with radii Râ‰<aa>λ. Optical antennas hold great promise for increasing the efficiency of photovoltaics, light-emitting devices, and optical sensors.
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Notes Approved no
Call Number RPLAB @ gujma @ Serial 749
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Author Shytov, A. V.; Levitov, L. S.; Beenakker, C. W. J.
Title (up) Electromechanical noise in a diffusive conductor Type Journal Article
Year 2002 Publication Phys. Rev. Lett. Abbreviated Journal Phys. Rev. Lett.
Volume 88 Issue 22 Pages
Keywords
Abstract Electrons moving in a conductor can transfer momentum to the lattice via collisions with impurities and boundaries, giving rise to a fluctuating mechanical stress tensor. The root-mean-squared momentum transfer per scattering event in a disordered metal (of dimension L greater than the mean free path l and screening length xi) is found to be reduced below the Fermi momentum by a factor of order l/L for shear fluctuations and (xi/L)^2 for pressure fluctuations. The excitation of an elastic bending mode by the shear fluctuations is estimated to fall within current experimental sensitivity for a nanomechanical oscillator.
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ISSN 0031-9007 ISBN Medium
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Notes Approved no
Call Number RPLAB @ s @ Serial 433
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Author Beck, M.; Klammer, M.; Lang, S.; Leiderer, P.; Kabanov, V. V.; Gol'tsman, G. N.; Demsar, J.
Title (up) Energy-gap dynamics of superconducting NbN thin films studied by time-resolved terahertz spectroscopy Type Journal Article
Year 2011 Publication Phys. Rev. Lett. Abbreviated Journal Phys. Rev. Lett.
Volume 107 Issue 17 Pages 4
Keywords NbN thin film, energy gap dynamics
Abstract Using time-domain terahertz spectroscopy we performed direct studies of the photoinduced suppression and recovery of the superconducting gap in a conventional BCS superconductor NbN. Both processes are found to be strongly temperature and excitation density dependent. The analysis of the data with the established phenomenological Rothwarf-Taylor model enabled us to determine the bare quasiparticle recombination rate, the Cooper pair-breaking rate and the electron-phonon coupling constant, λ=1.1±0.1, which is in excellent agreement with theoretical estimates.
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Call Number RPLAB @ gujma @ Serial 641
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Author Shah, Jagdeep; Pinczuk, A.; Gossard, A. C.; Wiegmann, W.
Title (up) Energy-loss rates for hot electrons and holes in GaAs quantum wells Type Journal Article
Year 1985 Publication Phys. Rev. Lett. Abbreviated Journal Phys. Rev. Lett.
Volume 54 Issue Pages 2045-2048
Keywords 2DEG, GaAs/AlGaAs, heat flow, electron-phonon, hole-phonon, carrier-phonon, interactions
Abstract We report the first direct determination of carrier-energy-loss rates in a semiconductor. These measurements provide fundamental insight into carrier-phonon interactions in semiconductors. Unexpectedly large differences are found in the energy-loss rates for electrons and holes in GaAs/AlGaAs quantum wells. This large difference results from an anomalously low electron-energy-loss rate, which we attribute to the presence of nonequilibrium optical phonons rather than the effects of reduced dimensionality or dynamic screening.
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Notes Approved no
Call Number Serial 633
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