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Zhang, Y.; Jiang, Z.; Small, J.P.; Purewal, M.S.; Tan, Y.-W.;

Quantum Hall Effect in Graphene at 45 T PI: Greg Boebinger, National High Magnetic Field Laboratory Florida State University, University of Florida, Los Alamos National Laboratory NSF Award Number: DMR-0084173.

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Zhang, Y.; Jiang, Z.; Small, J.P.; Purewal, M.S.; Tan, Y.-W.;

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  1. Quantum Hall Effect in Graphene at 45 TPI: Greg Boebinger, National High Magnetic Field LaboratoryFlorida State University, University of Florida, Los Alamos National Laboratory NSF Award Number: DMR-0084173 A single sheet of graphite, known as graphene, consists of a hexagonal array of carbon atoms. Graphene has electrons with a “relativistic” energy-momentum relation (inset). The linear dispersion gives rise to a new sequence of quantum Hall states differing from those in the non-relativistic two-dimensional electron gas. Using the 45T Hybrid Magnet at the National High Magnetic Field Laboratory, researchers in the user program have discovered new quantum Hall states in graphene. Quantum Hall states at filling factors n = +1 and -1 as well as n = +4 and -4 are clearly developed, as evidenced by the zero resistance in the longitudinal resistance (Rxx) and plateaus in the Hall resistance (Rxy). These states, seen only at high magnetic fields, imply a broken symmetry of unknown origin. Zhang, Y.; Jiang, Z.; Small, J.P.; Purewal, M.S.; Tan, Y.-W.; Fazlollahi, M.; Chudow, J.D.; Jaszczak, J.A.; Stormer, H.L. and Kim, P., Landau-Level Splitting in Graphene in High Magnetic Fields, Physical Review Letters, 96 (13), 136806 (2006)

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