Accession Number:

AD0256598

Title:

NEGATIVE MASS CARRIER PHENOMENA BY CYCLOTRON RESONANCE TECHNIQUES

Descriptive Note:

Corporate Author:

DAVID SARNOFF RESEARCH CENTER PRINCETON N J

Report Date:

1961-03-15

Pagination or Media Count:

1.0

Abstract:

An emissive cyclotron resonance, arising under optical excitation from the negative-mass branch of heavy holes in Ge, was established and extensively studied by use of circularly polarized microwaves. The effective mass is -0.26 or 0.06 mo as expected from the band-structure determined by Lincoln Laboratories. Efforts to enhance the emission, although not exhausted, still leave the effect submarginal for useful amplification by more than an order of magnitude. The properties of Landau levels for negative masses were delineated and their relevance to emission is discussed. The work allows evaluation of various proposals for uses of negativemass carrier phenomena. Another resonance absorptive was found with m equals 0.032 or - 0.007 mo and may arise from that part of the light holes near 100 axis that corresponds to the negative-mass region of heavy holes. The importance of these novel effects for future work is emphasized. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE