Conference paper
Superconducting Bi-Sr-Ca-Cu-O films prepared by laser ablation
A. Gupta, G. Koren, et al.
Proceedings of SPIE 1989
Using x-ray scattering, we have made the first observations of the spectrum of acousto-electrically amplified phonons in the quantum limit, where the conduction-electron system obeys quantum statistics and the observed phonon wave vector q is comparable to the electron Fermi wave vector kF. In GaAs samples with degenerate carrier distributions, we observe a dramatic quantum anomaly consisting of an abrupt decrease in phonon gain for q larger than 2kF. © 1971 The American Physical Society.
A. Gupta, G. Koren, et al.
Proceedings of SPIE 1989
G.S. Cargill III, A. Segmüller, et al.
Physical Review B
D.G. Carlson, A. Segmüller
Physical Review Letters
A. Segmüller
Physics Letters