Exchange enhancement of the spin splitting in a GaAs-GaxAl1-xAs heterojunction

verfasst von: R. J. Nicholas, R. J. Haug, K. V. Klitzing, G. Weimann
Abstract: The spin splitting in a GaAs-GaxAl1-xAs heterojunction has been studied by using the coincidence technique, where the Shubnikov de Haas oscillations of the conductivity are measured in tilted magnetic fields, and by measurements of the activation energy associated with spin-split conductivity minima. The spin splitting is found to be very strongly enhanced by exchange interactions, and values for the effective g factor as high as 6.2 have been found. The coincidence measurements were made at 0.37 K, and required the use of tilt angles in the range 85°89°. These show evidence of oscillatory spin splitting determined by the relative spin-population difference within the Landau levels. The activation energy was also studied as a function of tilt angle, and shows that the spin splitting is primarily determined by the perpendicular component of magnetic field for well-resolved levels. The dependence upon total field is sublinear and shows a saturation behavior at high tilt angles.
Externe Organisation(en): Max-Planck-Institut für Festkörperforschung
Forschungsinstitut der Deutschen Bundespost
Typ: Artikel
Journal: Physical Review B
Band: 37
Seiten: 1294-1302
Anzahl der Seiten: 9
ISSN: 0163-1829
Publikationsdatum: 01.01.1988
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Physik der kondensierten Materie
Elektronische Version(en): https://doi.org/10.1103/PhysRevB.37.1294 (Zugang: Unbekannt)

BibTeX

@article{d653cd3d2fc6401fb2540c7ea5449341,
title = "Exchange enhancement of the spin splitting in a GaAs-GaxAl1-xAs heterojunction",
abstract = "The spin splitting in a GaAs-GaxAl1-xAs heterojunction has been studied by using the coincidence technique, where the Shubnikov de Haas oscillations of the conductivity are measured in tilted magnetic fields, and by measurements of the activation energy associated with spin-split conductivity minima. The spin splitting is found to be very strongly enhanced by exchange interactions, and values for the effective g factor as high as 6.2 have been found. The coincidence measurements were made at 0.37 K, and required the use of tilt angles in the range 85°89°. These show evidence of oscillatory spin splitting determined by the relative spin-population difference within the Landau levels. The activation energy was also studied as a function of tilt angle, and shows that the spin splitting is primarily determined by the perpendicular component of magnetic field for well-resolved levels. The dependence upon total field is sublinear and shows a saturation behavior at high tilt angles.",
author = "Nicholas, {R. J.} and Haug, {R. J.} and Klitzing, {K. V.} and G. Weimann",
year = "1988",
month = jan,
day = "1",
doi = "10.1103/PhysRevB.37.1294",
language = "English",
volume = "37",
pages = "1294--1302",
journal = "Physical Review B",
issn = "0163-1829",
publisher = "American Institute of Physics",
number = "3",
}