期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 24, 期 23, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/24/23/235601
关键词
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资金
- NSF [DMR-1005536]
- Science, Please! Innovative Research Teams [SROP-4.2.2/08/1/2008-0011]
- Hungarian Academy Sciences
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005536] Funding Source: National Science Foundation
Because of the spin and Dirac-valley degrees of freedom, graphene allows the observation of one-, two- or four-component fractional quantum Hall effects in different parameter regions. We address the stability of various states in the SU(2) and SU(4) limits. In the SU(4) limit, we predict that new low-energy Goldstone modes determine the stability of the fractional quantum Hall states at 2/5, 3/7, etc; SU(4) skyrmions are not found to be relevant for the low-energy physics. These results are discussed in light of experiments.
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