Charged spin-texture excitations and the Hartree-Fock approximation in the quantum Hall effect
- Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)
- Instituto de Ciencia de Materiales (CSIC), Universidad Autonoma C-12, 28049 Madrid (Spain)
- Departement de Physique et Centre de Recherches en Physique du Solide, Universite de Sherbrooke, Sherbrooke, Quebec, J1K 2R1 (Canada)
- Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States)
We develop a Hartree-Fock approach to the charged spin-texture excitations (CSTE's) of the ferromagnetic incompressible ground state, which occurs in the quantum Hall effect at Landau-level filling factor [nu]=1. The CSTE's are the appropriate generalization of skyrmions to the situation when there is a nonzero Zeeman coupling. We find for Coulomb interactions that the charged spin-texture excitation energies are always smaller than the excitation energies of localized spin 1/2 quasiparticles and quasiholes. However, the amount by which the energy is lowered is quite small for typical experimental situations. The net spin of the CSTE's is always much larger than 1/2, suggesting that adding or removing charge from a filled Landau level rapidly degrades its spin polarization.
- OSTI ID:
- 7167394
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:15; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ARSENIC COMPOUNDS
ARSENIDES
CALCULATION METHODS
CRYSTAL MODELS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY LEVELS
FERROMAGNETISM
GALLIUM ARSENIDES
GALLIUM COMPOUNDS
GROUND STATES
HALL EFFECT
HARTREE-FOCK METHOD
MAGNETISM
MATHEMATICAL MODELS
MECHANICS
ORIENTATION
PHYSICAL PROPERTIES
PNICTIDES
QUANTUM MECHANICS
SPIN ORIENTATION
STATISTICAL MECHANICS
SUPERCONDUCTIVITY
ZEEMAN EFFECT