Charge-spin excitations of the Ising-type fractional quantum Hall ferromagnets

被引：3
|
作者：
Vyborny, Karel [1 ]
Dethlefsen, Annelene F. [2 ,3 ]
Haug, Rolf J. [2 ]
Wojs, Arkadiusz [4 ,5 ]
机构：
[1] Akad Ceske Republ, Fyzikalni Ustav, CZ-16253 Prague 6, Czech Republic
[2] Leibniz Univ Hannover, Inst Festkorperphys, D-30167 Hannover, Germany
[3] Solar Syst Pty Ltd, Abbotsford, Vic 3067, Australia
[4] Wroclaw Univ Technol, Inst Fizyki, PL-50370 Wroclaw, Poland
[5] Univ Cambridge, Cavendish Lab, TCM Grp, Cambridge CB3 0HE, England
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 04期
关键词：
2-DIMENSIONAL ELECTRON-GAS; REVERSED QUASI-PARTICLES; FILLED LANDAU-LEVEL; COMPOSITE FERMIONS; FINITE-SIZE; COLLECTIVE EXCITATIONS; PHASE-TRANSITION; MAGNETIC-FIELD; SKYRMIONS; SYSTEMS;
D O I：
10.1103/PhysRevB.80.045407
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 noninteracting composite-fermion picture where both fractions correspond to the same filling factor 2 of the composite fermions.
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页数：13
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