IMPROVED COMPOSITE-BOSON THEORY OF MONOLAYER AND BILAYER QUANTUM HALLFERROMAGNETS

Authors
Citation
Zf. Ezawa, IMPROVED COMPOSITE-BOSON THEORY OF MONOLAYER AND BILAYER QUANTUM HALLFERROMAGNETS, Physics letters. A, 249(3), 1998, pp. 223-230
Citations number
34
Categorie Soggetti
Physics
Journal title
ISSN journal
03759601
Volume
249
Issue
3
Year of publication
1998
Pages
223 - 230
Database
ISI
SICI code
0375-9601(1998)249:3<223:ICTOMA>2.0.ZU;2-D
Abstract
An improved composite-boson theory of quantum Hall ferromagnets is for mulated both for the monolayer and bilayer systems. In this scheme the field operator describes solely the physical degrees of freedom repre senting the deviation from the ground state. Skyrmions are charged exc itations confined to the lowest Landau level. By evaluating the excita tion energy of one skyrmion in the interlayer-coherent phase it is sho wn that the bilayer QH state becomes stabler as the interlayer density difference becomes larger. (C) 1998 Elsevier Science B.V.