期刊
PHYSICAL REVIEW LETTERS
卷 102, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.126806
关键词
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资金
- European Community [FP7/2007-2013]
- European 6th Framework Program [RITA-CT-3003-505474]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0803691] Funding Source: National Science Foundation
Optical absorption measurements are used to probe the spin polarization in the integer and fractional quantum Hall effect regimes. The system is fully spin polarized only at filling factor nu=1 and at very low temperatures (similar to 40 mK). A small change in filling factor (delta nu approximate to +/- 0.01) leads to a significant depolarization. This suggests that the itinerant quantum Hall ferromagnet at nu=1 is surprisingly fragile against increasing temperature, or against small changes in filling factor.
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