J.J. Quinn

Electromagnetic generation of acoustic waves and the surface impedance of metals

Abstract The generation of acoustic waves by rf electromagnetic radiation is studied, and its effect on the surface impedance of metals is evaluated.

Surface plasmons in degenerate polar semiconductors

Abstract The surface modes of a degenerate polar semiconductor are studied. The surface plasmons are found to be coupled strongly to surface optical phonons when the electron plasma frequency is of the order of the reststrahlen frequency.

Influence of the electron density profile on surface plasmons: Retardation effects☆

Abstract Hydrodynamics effects when used in conjunction with a diffuse surface are found to result in qualitatively new surface plasmon behavior in the optical region ( q≈ ω c ).

Acoustic nuclear spin resonance in metals

Abstract The propagation of transverse acoustic waves in metals parallel to a strong d.c. magnetic field is studied. The attenuation of the acoustic wave via magnetic dipole coupling to the nuclear spins is evaluated.

Coupling of polar phonons and magnetoplasma modes of a degenerate semiconductor

Abstract The normal modes of a degenerate polar semiconductor are studied for arbitrary direction of propagation relative to a uniform d.c. magnetic field. Dispersion of the modes and optical reflectivity are calculated in the long wavelength limit.

Attenuation of longitudinal sound waves in potassium in an oblique magnetic field

Abstract The absorption edge for Doppler shifted cyclotron resonance of longitudinal sound waves in potassium is found to agree with the prediction of the free electron model, demonstrating that the ground state of this material does not possess a spin density wave aligned parallel to the magnetic field.

Free carrier absorption due to electron-(magneto) plasmon interaction: Effect of impurity scattering

Abstract The interpretation of structure in the infrared absorption spectrum of InSbin terms of electron-(magneto) plasmon interaction is considered in light of the question of separability of plasmon and center of mass degrees of freedom. The presence of impurities is shown to prohibit this separation and to remove the associated exact cancellation obtained for a perfect continuum.

Fermi liquid theory of the dynamic spin susceptibility of metals

Abstract The dynamic spin susceptibility of a metal with an arbitrary Fermi surface is derived for the situation in which the Fermi liquid interaction function ψ( p , p ) can be approximated by a constant.

Novel collective excitation spectrum and lifetime of electrons in a tunneling semiconductor superlattice

Abstract We present theoretical results for the effect of electron tunneling on the collective excitation spectrum and lifetime of electrons in a semiconductor superlattice. Using a tight-binding envelope function and taking account of the nearest-neighbor-layer overlap enables us to derive the dynamical dielectric tensor, the zero of which yields the peculiar dispersion relations. The quasiparticle lifetime of excited electrons is evaluated by using the plasmon-pole approximation and is shown to display novel behavior.