Transport Phenomena and Noise in Real Quantum Wires.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1994
- Accession Number
- ADA290493
Entities
People
- Vladimir Mitin
Organizations
- Wayne State University