Skyrmions and the ν=1 Quantum Hall Ferromagnet

• Authors: M. Manfra , B. Goldberg , L. Pfeiffer , K. West
• Languages of publication: EN

Abstracts

EN

Recent experimental and theoretical investigations have resulted in a shift in our understanding of the ν=1 quantum Hall state. There now exists a wealth of evidence that the excitation gap and the resulting quasiparticle spectrum at ν=1 are due predominately to the ferromagnetic many-body exchange interaction. A great variety of experimentally observed correlations at ν= 1 cannot be incorporated into a perturbative expansion around the single-particle model, a scheme long thought to describe the integral quantum Hall effect at filling factor 1. Theorists now refer to the ν=1 state as the quantum Hall ferromagnet. In this paper we review recent theoretical and experimental progress and detail our own optical investigations of the ν= 1 quantum Hall regime. The technique of magneto-absorption spectroscopy has proven to be powerful a probe of the occupancy of the lowest Landau level in the regime of 0.7<ν<1.3 about the spin gap. Additionally, we have performed simultaneous measurements of the absorption, photoluminescence and photoluminescence excitation spectra of the ν=1 state in order to elucidate the role of excitonic and relaxation effects in optical spectroscopy in the quantum Hall regime.

Keywords

EN

73.40.Hm; 78.66.-w; 73.20.Mf; 71.70.Gm; 73.20.Dx

Discipline

• 78.66.-w: Optical properties of specific thin films(for optical properties of low-dimensional, mesoscopic, and nanoscale materials, see 78.67.-n; for optical properties of surfaces, see 78.68.+m)
• 73.20.Mf: Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)(for collective excitations in quantum Hall effects, see 73.43.Lp)
• 71.70.Gm: Exchange interactions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 92
• Issue: 4
• Pages: 621-632

Dates

published

1997-10

Contributors

author

M. Manfra

• Dept. of Physics, Boston University, Boston MA 02215, USA

author

B. Goldberg

• Dept. of Physics, Boston University, Boston MA 02215, USA

author

L. Pfeiffer

• Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA

author

K. West

• Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA

Identifiers

DOI

10.12693/APhysPolA.92.621