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Charge-spin excitations of the Ising-type fractional quantum Hall ferromagnets
- 1.0336022 - FZÚ 2010 RIV US eng J - Journal Article
Výborný, Karel - Dethlefsen, A.F. - Haug, R.J. - Wójs, A.
Charge-spin excitations of the Ising-type fractional quantum Hall ferromagnets.
[Nábojové a spinové excitace zlomkových kvantových Hallových feromagnetů Isingova typu.]
Physical Review. B. Roč. 80, č. 4 (2009), 045407/1-045407/13. ISSN 1098-0121
R&D Projects: GA MŠMT LC510; GA AV ČR KJB100100802; GA AV ČR KAN400100652
Institutional research plan: CEZ:AV0Z10100521
Keywords : fractional quantum Hall effect * quantum Hall ferromagnets
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.475, year: 2009
We study the low lying excitations from the fractional quantum Hall states at filling factors 2/3 and 2/5 and argue that the charge-carrying excitations involve spin flips, and in particular, possibly more than one. Energies obtained by exact diagonalization and transport activation gaps measured over a wide range of magnetic fields are invoked. We discuss the relevance of the non-interacting composite fermion picture where both fractions correspond to the same filling factor two of the composite fermions.
Srovnáváme výpočty exaktní diagonalizace s velikostmi gapů změřenými v aktivovaném transportu. Diskutujeme možnost excitací se spinem vyšším než jedna při filling faktorech 2/3 a 2/5.
Permanent Link: http://hdl.handle.net/11104/0180352
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