On the existence and detection of Bloch oscillations in superlattices

R. O. Grondin, W. Porod, J. Ho, D. K. Ferry, G. J. Iafrate

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

While many predicted superlattice behaviors depend on the presence of Bloch oscillations, the existence of such oscillations remains problematical. Here, we consider procedures by which their existence within a superlattice could be detected. We first set upper and lower bounds on the necessary fields. We then demonstrate that while a negative differential mobility is expected, no resonant peak occurs in this mobility at the Bloch frequency. However, we provide two ways of directly observing Bloch oscillations. In the first, we note the existence of structures in the dc velocity-field characteristic when an externally applied RF field has a frequency which is harmonically related to the Bloch frequency. The second approach is to measure the velocity fluctuation noise spectra, which should have a peak at the field-tunable Bloch frequency.

Original languageEnglish (US)
Pages (from-to)183-186
Number of pages4
JournalSuperlattices and Microstructures
Volume1
Issue number2
DOIs
StatePublished - 1985

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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