Determination of one-dimensional subband spacings in InAs/AlSb ballistic constrictions using magnetic-field measurements

Steven J Koester, C. R. Bolognesi, M. Thomas, E. L. Hu, H. Kroemer, M. J. Rooks

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Quantized conductance measurements on InAs/AlSb split-gate ballistic constrictions with a varying perpendicular magnetic field are reported. The magnetic depopulation of the one-dimensional subbands is used to determine the energy spacing of the subbands in the constriction. Assuming a parabolic lateral-confining potential, a theoretical fit to our data reveals subband spacings as large as 10 meV. For fields greater than ∼2 T, conductance plateaus emerge at odd integer multiples of e2/h, indicating the lifting of the spin degeneracy. The magnetic-field dependence of the G=3e2/h conductance step width is used to obtain a rough estimate of the effective g factor in the constriction.

Original languageEnglish (US)
Pages (from-to)5710-5712
Number of pages3
JournalPhysical Review B
Volume50
Issue number8
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

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