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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents

ID: 192954.0, MPI für Festkörperforschung / FKF Publikationen 2004
Spin and interaction effects in Shubnikov-de Haas oscillations and the quantum Hall effect in GaN/AlGaN heterostructures
Authors:Knap, W.; Fal'ko, V. I.; Frayssinet, E.; Lorenzini, P.; Grandjean, N.; Maude, D.; Karczewski, G.; Brandt, B. L.; Lusakowski, J.; Grzegory, I.; Leszczynski, M.; Prystawko, P.; Skierbiszewski, C.; Porowski, S.; Hu, X.; Simin, G.; Khan, M. A.; Shur, M. S.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Journal of Physics: Condensed Matter
Issue / Number:20
Start Page:3421
End Page:3432
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present the results of high magnetic field (up to 30 T) and
temperature (50 mK-80 K) dependent transport measurements on a 2DEG in
GaN/AlGaN heterojunctions. A high mobility (above 60000 cm(2) V-1 s(-1)
at 4 K) 2DEG was obtained by MBE growth of dislocation free GaN and
AlGaN layers on semi-insulating bulk GaN substrates. A cyclotron gap
and spin splitting are observed. Results from two studies are reported:
(i) a tilted field experiment determining the 2DEG g*-factor from the
angular modulation of the amplitude of SdH oscillations; (ii) quantum
Hall effect measurements determining the activation energies for spin
and cyclotron energy gaps at even and odd filling factors. The observed
'cyclotron gap' enhancement is attributed to the effect of
electron-electron interaction and it is estimated using the model of a
2D-screened Coulomb potential. The analytic result for the enhancement
of the,cyclotron gap' yields an addition to the activation energy,
epsilon(even)(x) approximate to kappa(h) over bar omega(c), K = 1.06
roota(2)n(e), which is proportional to the magnetic field and resembles
the mass renormalization.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Univ Montpellier 2, GES, UMR5650 CNRS, F-34095 Montpellier, France.
; PAN UNIPRESS, High Pressure Res Ctr, PL-01142 Warsaw, Poland.
; Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England.
; CNRS, CRHEA, F-06560 Valbonne, France.
; CNRS, MPI, Grenoble High Magnet Field Lab, F-38000 Grenoble, France.
; Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA.
; Univ S Carolina, Dept ECE, Columbia, SC 29208 USA.
; Rensselaer Polytech Inst, Dept ECSE, Troy, NY 12180 USA.
; Rensselaer Polytech Inst, Broadband Ctr, Troy, NY 12180 USA.
Identifiers:ISI:000221977400016 [ID No:1]
ISSN:0953-8984 [ID No:2]
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