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Generation and amplification of confined acoustic phonons in a quantum wire via the Čerenkov effect

Authors
Journal
Physics Letters A
0375-9601
Publisher
Elsevier
Publication Date
Volume
342
Identifiers
DOI: 10.1016/j.physleta.2005.05.036
Keywords
  • Nanoscience
Disciplines
  • Musicology
  • Physics

Abstract

Abstract We study the effect of generation and amplification of confined acoustic phonons by drifting electrons in an embedded quantum wire. A general formula for the phonon amplification coefficient α has been derived. Our calculations show that the quantum wire structure can be used for electrical generation of an intense high-frequency coherent phonon flux. The amplification coefficients of the order of cm −1 can be achieved in the sub-THz range for the example of Si 0.5Ge 0.5 quantum wires embeded in Si.

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