Title
Graphene in extremely high magnetic fields
Document Type
Article
Publication Date
2007
Abstract
We have studied the quantum Hall (QH) effect in two-dimensional electrons and holes in high quality graphene samples in strong magnetic fields up to 45 T. A distinctive half-integer QH effect is discovered at high magnetic fields, with QH plateaus appearing at filling factors ν = ±4(|n| + 1/2), where n is the Landau level (LL) index. This finding is consistent with theoretical predictions. In addition, in the extreme magnetic quantum limit with magnetic fields up to 45 T, we observe LL splittings in graphene at filling factors ν = 0,±1,±4. Further detailed investigation shows that the presence of the ν = 0,±1 QH states indicates the n = 0 LL at the charge neutral Dirac point splits into four sublevels, lifting both the sublattice and the spin degeneracy, while the QH states at ν = ±4 can be attributed to lifting of the spin degeneracy of the n = ±1 LLS.
Publication Title
International Journal of Modern Physics B
Recommended Citation
Jiang, Z.,
Zhang, Y.,
Tan, Y. W.,
Jaszczak, J. A.,
Stormer, H. L.,
&
Kim, P.
(2007).
Graphene in extremely high magnetic fields.
International Journal of Modern Physics B,
21(8).
http://doi.org/10.1142/S0217979207042549
Retrieved from: https://digitalcommons.mtu.edu/physics-fp/35
Publisher's Statement
© World Scientific Publishing Co Pte Ltd. Publisher's version of record: https://dx.doi.org/10.1142/S0217979207042549