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

doi:10.1007/BF02583678

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

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Abstract

Raman scattering on InAs coated with 60 to 100Å thick Nb films (T_c = 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 language	English (US)
Pages (from-to)	741-742
Number of pages	2
Journal	Czechoslovak Journal of Physics
Volume	46
Issue number	SUPPL. 2
DOIs	https://doi.org/10.1007/BF02583678
State	Published - 1996
Externally published	Yes

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General Physics and Astronomy

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title = "Optical detection of the superconducting proximity effect: Raman Scattering on Nb/lnAs",

abstract = "Raman scattering on InAs coated with 60 to 100{\AA} 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 ~5{\AA}. 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%.",

author = "Greene, {L. H.} and Dorsten, {J. F.} and Roshchin, {I. V.} and Abeyta, {A. C.} and Tanzer, {T. A.} and Feldmann, {W. L.} and Bohn, {P. W.}",

year = "1996",

doi = "10.1007/BF02583678",

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volume = "46",

pages = "741--742",

journal = "Czechoslovak Journal of Physics",

issn = "0011-4626",

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TY - JOUR

T1 - Optical detection of the superconducting proximity effect

T2 - Raman Scattering on Nb/lnAs

AU - Greene, L. H.

AU - Dorsten, J. F.

AU - Roshchin, I. V.

AU - Abeyta, A. C.

AU - Tanzer, T. A.

AU - Feldmann, W. L.

AU - Bohn, P. W.

PY - 1996

Y1 - 1996

N2 - 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%.

AB - 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%.

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

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