Accession Number : ADA290493

Title :   Transport Phenomena and Noise in Real Quantum Wires.

Descriptive Note : Final rept. 30 Mar 92-1 Sep 94,

Corporate Author : WAYNE STATE UNIV DETROIT MI

Personal Author(s) : Mitin, Vladimir

PDF Url : ADA290493

Report Date : DEC 1994

Pagination or Media Count : 10

Abstract : We have calculated electron scattering by confined LO, localized SO, and bulk-like acoustic phonons in quantum wires (QWIs). We have demonstrated that the role of LO phonon scattering is dominant in a wide range of parameters. The elasticity of acoustic phonon scattering has been a commonly used approximation. Our results demonstrate that electron scattering by acoustic phonons in QWIs becomes essentially inelastic and is an effective mechanism of energy dissipation. We have obtained superlinear electron transport in QWIs at low temperatures. This superlinearity stems from reduction of acoustic phonon scattering efficiency when the electron system is heated. We have discovered a novel effect of negative absolute photoconductivity in QWIs. This effect is caused by strong asymmetry of the electron distribution function due to resonant scattering by optical phonons. We have investigated the role of different phonons on electron transport in and have found that a square cross-section is optimum for high mobilities. We have calculated nonequilibrium electron noise in QWIs. Our results show that a major noise source in QWIs is electron scattering by acoustic (low field) and optical (high field) phonons. In general, noise in QWIs is essentially suppressed.

Descriptors :   *ELECTRON TRANSPORT, *QUANTUM ELECTRONICS, *NOISE(ELECTRICAL AND ELECTROMAGNETIC), *PHOTOCONDUCTIVITY, LOW TEMPERATURE, MOBILITY, PARAMETERS, RESONANCE SCATTERING, ELECTRON SCATTERING, ELASTIC PROPERTIES, DISSIPATION, ELECTRON ENERGY, ASYMMETRY, CROSS SECTIONS, QUANTUM EFFICIENCY, NONEQUILIBRIUM FLOW, PHONONS, RANGE(EXTREMES), ACOUSTIC SCATTERING, DISTRIBUTION FUNCTIONS.

Subject Categories : Electricity and Magnetism
      Quantum Theory and Relativity
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE