Optical detection of the superconducting proximity effect: Raman Scattering on Nb/lnAs

L. H. Greene, J. F. Dorsten, I. V. Roshchin, A. C. Abeyta, T. A. Tanzer, W. L. Feldmann, P. W. Bohn

Research output: Contribution to journalArticlepeer-review

Abstract

Raman scattering on InAs coated with 60 to 100Å thick Nb films (Tc = 2.5 to 5K) is studied. The Nb films, sputtered onto in-situ ion-etched n+-InAs (1.2 × 1019cm-3) are flat to ~5Å. The low-frequency coupled plasmon-phonon Raman mode (L-) associated with bulk InAs is centered at 221cm-1. The forbidden LO phonon at 237cm-1, associated with the surface chargeaccumulation region (CAR), is observed because the thickness of the surface CAR is less than the Thomas-Fermi screening length. As the temperature is reduced below To. the magnitude of the LO phonon mode intensity, relative to that of the L- mode, increases by more than 40%.

Original languageEnglish (US)
Pages (from-to)741-742
Number of pages2
JournalCzechoslovak Journal of Physics
Volume46
Issue numberSUPPL. 2
DOIs
StatePublished - Dec 1 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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