Probing symmetry breaking in multilayer epitaxial graphene by circularly polarized magneto-infrared spectrscopy
ORAL
Abstract
Symmetry breaking in graphene in high magnetic fields has long been an intriguing problem. Here, we report a magneto-infrared transmission spectroscopy study of multilayer epitaxial graphene with circularly polarized light. A four-fold splitting of the zeroth Landau level is found in high magnetic fields and attributed to the lifting of the valley and spin degeneracies and the electron-hole asymmetry. We extract the magnetic field dependence of the splitting gaps and discuss their possible origins. We also observe a surprising electron-hole asymmetry reversal between the monolayer and bilayer graphene components of multilayer epitaxial graphene and propose a possible interpretation.
*This work is primarily supported by the DOE (Grant No. DDE-FG02-07ER46451). The IR measurement of this work was performed at the National High Magnetic Field Laboratory (NHMFL), which is supported by National Science Foundation Cooperative Agreement No. DMR-1157490 and the State of Florida. Y.J. acknowledges support from the NHMFL Jack Crow fellowship.
–
Presenters
-
Yuxuan Jiang
- National High Magnetic Field Laboratory