User menu

Accès à distance ? S'identifier sur le proxy UCLouvain

NMR determination of 2D electron spin polarization at nu = 1/2.

Primary tabs

Melinte, Sorin [UCL] Freytag, N. [CNRS Grenoble] Horvatic, M. [CNRS Grenoble] Berthier, C. [Grenoble High Magnetic Field Laboratory, MPI-FKF and CNRS / Laboratoire de Spectrométrie Physique, Université J. Fourier] Levy, L.P. [CNRS Grenoble / Université J.Fourier] Bayot, Vincent [UCL] Shayegan, M. [Princeton University]

Using a "standard" NMR spin-echo technique we determined the spin polarization P of two-dimensional electrons, confined to GaAs quantum wells, from the hyperfine shift of Ga nuclei located in the wells. Concentrating on the temperature ( 0.05 less, similarT less, similar10 K) and magnetic field ( 7 less, similarB less, similar17 T) dependencies of P at Landau level filling factor nu = 1/2, we find that the results are described well by a simple model of noninteracting composite fermions, although some inconsistencies remain when the two-dimensional electron system is tilted in the magnetic field.

Document type Article de périodique (Journal article) – Article de recherche – Journal Article
Access type Accès restreint
Publication date 2000
Language Anglais
Journal information "Physical Review Letters" - Vol. 84, no. 2, p. 354-357 (2000)
Peer reviewed yes
Publisher The American Physical Society ((United States))
issn 0031-9007
e-issn 1079-7114
Publication status Publié
Affiliation UCL - FSA/ELEC - Département d'électricité
Links
  1. H. L. Stormer, Perspectives in Quantum Hall Effects, (1997)
  2. Jain J. K., Composite-fermion approach for the fractional quantum Hall effect, 10.1103/physrevlett.63.199
  3. Halperin B. I., Lee Patrick A., Read Nicholas, Theory of the half-filled Landau level, 10.1103/physrevb.47.7312
  4. T. Chakraborty, The Quantum Hall Effects: Integral and Fractional (1995)
  5. Clark R. G., Haynes S. R., Suckling A. M., Mallett J. R., Wright P. A., Harris J. J., Foxon C. T., Spin configurations and quasiparticle fractional charge of fractional-quantum-Hall-effect ground states in theN=0Landau level, 10.1103/physrevlett.62.1536
  6. Eisenstein J. P., Stormer H. L., Pfeiffer L., West K. W., Evidence for a phase transition in the fractional quantum Hall effect, 10.1103/physrevlett.62.1540
  7. Eisenstein J. P., Stormer H. L., Pfeiffer L. N., West K. W., Evidence for a spin transition in the ν=2/3 fractional quantum Hall effect, 10.1103/physrevb.41.7910
  8. Engel L. W., Hwang S. W., Sajoto T., Tsui D. C., Shayegan M., Fractional quantum Hall effect at ν=2/3 and 3/5 in tilted magnetic fields, 10.1103/physrevb.45.3418
  9. Park K., Jain J. K., Phase Diagram of the Spin Polarization of Composite Fermions and a New Effective Mass, 10.1103/physrevlett.80.4237
  10. Kang W., He Song, Stormer H. L., Pfeiffer L. N., Baldwin K. W., West K. W., Temperature Dependent Scattering of Composite Fermions, 10.1103/physrevlett.75.4106
  11. Barrett S. E., Tycko R., Pfeiffer L. N., West K. W., Directly detected nuclear magnetic resonance of optically pumped GaAs quantum wells, 10.1103/physrevlett.72.1368
  12. Barrett S. E., Dabbagh G., Pfeiffer L. N., West K. W., Tycko R., Optically Pumped NMR Evidence for Finite-Size Skyrmions in GaAs Quantum Wells near Landau Level Fillingν=1, 10.1103/physrevlett.74.5112
  13. Tycko R, Barrett S., Dabbagh G, Pfeiffer L., West K., Electronic states in gallium arsenide quantum wells probed by optically pumped NMR, 10.1126/science.7539550
  14. Khandelwal P., Kuzma N. N., Barrett S. E., Pfeiffer L. N., West K. W., Optically Pumped Nuclear Magnetic Resonance Measurements of the Electron Spin Polarization in GaAs Quantum Wells near Landau Level Filling Factorν=13, 10.1103/physrevlett.81.673
  15. Kuzma N. N., Ultraslow Electron Spin Dynamics in GaAs Quantum Wells Probed by Optically Pumped NMR, 10.1126/science.281.5377.686
  16. Bayot V., Santos M. B., Shayegan M., Oscillations in the thermal conductivity of a GaAs/AlxGa1−xAs heterostructure in the fractional quantum Hall regime, 10.1103/physrevb.46.7240
  17. Melinte S., Grivei E., Bayot V., Shayegan M., Heat Capacity Evidence for the Suppression of Skyrmions at Large Zeeman Energy, 10.1103/physrevlett.82.2764
  18. Abragam A., Hebel L. C., The Principles of Nuclear Magnetism, 10.1119/1.1937646
  19. MacDonald A. H., Palacios J. J., Magnons and Skyrmions in fractional Hall ferromagnets, 10.1103/physrevb.58.r10171
  20. Kukushkin I. V., v. Klitzing K., Eberl K., Spin Polarization of Composite Fermions: Measurements of the Fermi Energy, 10.1103/physrevlett.82.3665
  21. Dementyev A. E., Kuzma N. N., Khandelwal P., Barrett S. E., Pfeiffer L. N., West K. W., Optically Pumped NMR Studies of Electron Spin Polarization and Dynamics: New Constraints on the Composite Fermion Description ofν=1/2, 10.1103/physrevlett.83.5074
Bibliographic reference Melinte, Sorin ; Freytag, N. ; Horvatic, M. ; Berthier, C. ; Levy, L.P. ; et. al. NMR determination of 2D electron spin polarization at nu = 1/2.. In: Physical Review Letters, Vol. 84, no. 2, p. 354-357 (2000)
Permanent URL http://hdl.handle.net/2078.1/8651