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

S. J. Koester; C. R. Bolognesi; M. Thomas; E. L. Hu; H. Kroemer; M. J. Rooks

doi:10.1103/PhysRevB.50.5710

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

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

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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 language	English (US)
Pages (from-to)	5710-5712
Number of pages	3
Journal	Physical Review B
Volume	50
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.50.5710
State	Published - 1994
Externally published	Yes

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

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.",

author = "Koester, {S. J.} and Bolognesi, {C. R.} and M. Thomas and Hu, {E. L.} and H. Kroemer and Rooks, {M. J.}",

year = "1994",

doi = "10.1103/PhysRevB.50.5710",

language = "English (US)",

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T1 - Determination of one-dimensional subband spacings in InAs/AlSb ballistic constrictions using magnetic-field measurements

AU - Koester, S. J.

AU - Bolognesi, C. R.

AU - Thomas, M.

AU - Hu, E. L.

AU - Kroemer, H.

AU - Rooks, M. J.

PY - 1994

Y1 - 1994

N2 - 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.

AB - 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.

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

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