Improved Composite-Boson Theory of Monolayer and Bilayer Quantum Hall Ferromagnets

Abstract

An improved composite-boson theory of quantum Hall ferromagnets is formulated both for the monolayer and bilayer systems. In this scheme the field operator describes solely the physical degrees of freedom representing the deviation from the ground state. Skyrmions are charged excitations confined to the lowest Landau level. By evaluating the excitation energy of one skyrmion in the interlayer-coherent phase it is shown that the bilayer QH state becomes stabler as the interlayer density difference becomes larger.

14 pages including 1 figure; Physics Letters A (to be published)

References in corpus (4)

• Observation of the e/3 Fractionally Charged Laughlin Quasiparticles
• Towards a field theory of the fractional quantum Hall states
• Phase Transition in ν=2 Bilayer Quantum Hall State
• Quantum Coherence and W_infty*SU(2) Algebra in Bilayer Quantum Hall Systems

Cited by in corpus (6)

• Bias-voltage induced phase-transition in bilayer quantum Hall ferromagnets
• Lattice Pseudospin Model for $\nu =1$ Quantum Hall Bilayers
• Interlayer Coherence in the $\nu =1$ and $\nu =2$ Bilayer Quantum Hall States
• Quantum Hall Solitons with Intertwined Spin and Pseudospin at $\nu =1$
• $\nu =2$ Bilayer Quantum Hall System in Tilted Magnetic Field
• Squeezed states for Frenkel-like two-fermion composite bosons