MAGNETO-ACOUSTIC EFFECTS IN TILTED MAGNETIC FIELDS

Abstract

It is shown that the entire Fermi surface can be mapped by using geometric resonances in the sound attenuation in tilted magnetic fields and the drift velocity of the carriers along the magnetic field simultaneously determined. The general features of the phenomena considered do not prove dependent on the particular models used in our calculations. In addition to the results specifically pertaining to tilted fields, when the assumptions of equal effective masses and relaxation times are dropped for a two band model of a semi-metal, the contribution of the two types of carriers to the ultrasonic absorption is additive. On examining the contribution to the absorption for a model of majority and minority carriers, the minority carriers dominate the attenuation when they are in the region of geometric resonances. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1961
Accession Number
AD0263755

Entities

People

  • Harold N. Spector

Organizations

  • University of Chicago

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Absorption
  • Acoustic Propagation
  • Band Structures
  • Bessel Functions
  • Electric Fields
  • Electromagnetic Fields
  • Electron Gas
  • Electrons
  • Energy Bands
  • Fermi Surfaces
  • Free Electrons
  • Frequency
  • Government Procurement
  • Magnetic Fields
  • Materials
  • Relaxation Time
  • Sound Waves

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Materials Science and Engineering.
  • Plasma Physics / Magnetohydrodynamics