The Nature of Quantum Hall States near the Charge Neutral Dirac Point in Graphene
| Autor: | Jiang, Z., Zhang, Y., Stormer, H. L., Kim, P. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 99, 106802 (2007) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.99.106802 |
| Popis: | We investigate the quantum Hall (QH) states near the charge neutral Dirac point of a high mobility graphene sample in high magnetic fields. We find that the QH states at filling factors $\nu=\pm1$ depend only on the perpendicular component of the field with respect to the graphene plane, indicating them to be not spin-related. A non-linear magnetic field dependence of the activation energy gap at filling factor $\nu=1$ suggests a many-body origin. We therefore propose that the $\nu=0$ and $\pm1$ states arise from the lifting of the spin and sub-lattice degeneracy of the $n=0$ LL, respectively. Comment: 4 pages, 4 figures, to appear in Phys. Rev. Lett |
| Databáze: | arXiv |
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