Optical detection of the superconducting proximity effect: Raman scattering on Nb/InAs

@article{Greene1996OpticalDO,
  title={Optical detection of the superconducting proximity effect: Raman scattering on Nb/InAs},
  author={Laura H. Greene and J. F. Dorsten and Igor V. Roshchin and Adam Christopher Abeyta and Troy A. Tanzer and William L. Feldmann and Paul W Bohn},
  journal={Czechoslovak Journal of Physics},
  year={1996},
  volume={46},
  pages={741-742}
}
Raman scattering on InAs coated with 60 to 100Å thick Nb films (Tc=2.5 to 5K) is studied. The Nb films, sputtered ontoin-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 221 cm−1. The forbidden LO phonon at 237cm−1, associated with the surface charge accumulation region (CAR), is observed because the thickness of the surface CAR is less than the Thomas-Fermi screening length. As the… CONTINUE READING