Theory of Striped Hall Ferromagnets
نویسنده
چکیده
We study spin and charge striped states at the half-filled high Landau level in the zero Zeeman energy limit using a HartreeFock approximation. It is shown that a ferromagnetic striped Hall state is more stable than the antiferromagnetic striped state or charge striped state. We calculate the collective excitations using the single mode approximation.
منابع مشابه
Skyrmions and Quantum Hall Ferromagnets in Improved Composite-Boson Theory
An improved composite-boson theory of quantum Hall ferromagnets is proposed. It is tightly related with the microscopic wave-function theory. The characteristic feature is that the field operator describes solely the physical degrees of freedom representing the deviation from the ground state. It presents a powerful tool to analyze excited states within the lowest Landau level. Excitations incl...
متن کاملGeometry and the Anomalous Hall Effect in Ferromagnets
Geometry crops up in physics in unexpected ways. The example in this talk traces an idea proposed 50 years ago. Mired in controversy from the start, it simmered for a long time as an unresolved problem, but has now re-emerged as a topic with modern appeal. In 1954, Karplus and Luttinger (KL) [1] discovered the earliest instance of the Berry phase [3] in solids when they calculated the charge cu...
متن کاملHartree-Fock Theory of Skyrmions in Quantum Hall Ferromagnets
We report on a study of the charged-skyrmion or spin-texture excitations which occur in quantum Hall ferromagnets near odd Landau level filling factors. Particle-hole symmetry is used to relate the spin-quantum numbers of charged particle and hole excitations and neutral particle-hole pair excitations. Hartree-Fock theory is used to provide quantitative estimates of the energies of these excita...
متن کاملThermodynamics of quantum Hall ferromagnets.
The two-dimensional interacting electron gas at Landau level filling factor ν = 1 and temperature T = 0 is a strong ferromagnet; all spins are completely aligned by arbitrarily weak Zeeman coupling. We report on a theoretical study of its thermodynamic properties using a many-body perturbation theory approach and concentrating on the recently measured temperature dependence of the spin magnetiz...
متن کاملBerry-phase effect in anomalous thermoelectric transport.
We develop a theory of the Berry-phase effect in anomalous transport in ferromagnets driven by statistical forces such as the gradient of temperature or chemical potential. Here a charge Hall current arises from the Berry-phase correction to the orbital magnetization rather than from the anomalous velocity, which does not exist in the absence of a mechanical force. A finite-temperature formula ...
متن کامل