Optical detection of the superconducting proximity effect

Laura H. Greene; A. C. Abeyta; Igor V. Roshchin; Ian K. Robinson; J. F. Dorsten; T. A. Tanzer; Paul W. Bohn

doi:10.1117/12.241775

10 June 1996 Optical detection of the superconducting proximity effect

Laura H. Greene, A. C. Abeyta, Igor V. Roshchin, Ian K. Robinson, J. F. Dorsten, T. A. Tanzer, Paul W. Bohn

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241775
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

We present the first detection of a superconducting proximity effect by optical techniques. Raman scattering on n⁺-InAs is performed through very thin, high-quality, superconducting Nb films grown directly on the (100)InAs surface. The 6 to 10 nm thick Nb films exhibit T_cs of 2.5 to 5.5 K, as measured by electronic transport, and are flat to approximately 0.5 nm, as measured by x-ray reflectivity. As the Nb/InAs structure is cooled below the superconducting transition temperature, the magnitude of the unscreened LO phonon mode, associated with the surface charge accumulation layer in the InAs, is observed to be enhanced by more than 40%. This reversible change is observed only when the Nb is in good electrical contact with the InAs.

Citation Download Citation

Laura H. Greene, A. C. Abeyta, Igor V. Roshchin, Ian K. Robinson, J. F. Dorsten, T. A. Tanzer, and Paul W. Bohn "Optical detection of the superconducting proximity effect", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241775

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