Skyrmions and the crossover from the integer to fractional quantum Hall effect at small Zeeman energies

Shivaji Lal Sondhi, A. Karlhede, S. A. Kivelson, E. H. Rezayi

Research output: Contribution to journalArticle

776 Scopus citations

Abstract

We study the two-dimensional electron gas in a high magnetic field at filling factor ν=1 for an arbitrary ratio of the Zeeman energy gμBB to the typical interaction energy. We find that the system always has a gap, even when the one-particle gap vanishes, i.e., when g=0. When g is sufficiently large, the quasiparticles are perturbatively related to those in the noninteracting limit; we compute their energies to second order in the Coulomb interaction. For g smaller than a critical value gc the quasiparticles change character; in the limit of g→0, they are skyrmions-spatially unbounded objects with infinite spin. In GaAs heterojunctions, the gap is unambiguously predominantly due to correlation effects; indeed, we tentatively conclude that g is always smaller than gc, so the relevant quasiparticles are the skyrmions. The generalization to other odd-integer filling factors, and to ν=1/3 and 1/5, is discussed.

Original languageEnglish (US)
Pages (from-to)16419-16426
Number of pages8
JournalPhysical Review B
Volume47
Issue number24
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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