Gap opening in the zeroth Landau level of graphene

Topological phases in the zeroth Landau level of bilayer graphene.

We analyze the phase diagram of the zeroth Landau level of bilayer graphene, taking into account the realistic effects of screening of the Coulomb interaction and strong mixing between two degenerate sublevels. We identify robust quantum Hall states at filling factors ν=-1, -4/3, -5/3, -8/5, -1/2 and discuss the nature of their ground states, collective excitations, and relation to the more fam...

Fractional and integer quantum Hall effects in the zeroth Landau level in graphene

Dmitry A. Abanin,1,2,3 Benjamin E. Feldman,1 Amir Yacoby,1 and Bertrand I. Halperin1 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA 2Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada N2L 6B9 3Institute for Quantum Computing, Waterloo, Ontario, Canada N2L 3G1 (Received 21 March 2013; revised manuscript received 2 July 2013; published 4 Septem...

the effect of authentic listening materials on the listening proficiency of efl learners in the intermediate level

having conducted the experiment and analysed the data, the researcher computed the groups mean scores and variances for the test relating to the research question. as the final atep, a t-test was conodonted for the hypothesis. as noted earlier, the significance level was determined at .05 and .01 respectively. the observed t-value was higher than the critical t-value at. 5 and .01 levels. conse...

Zero Landau level in folded graphene nanoribbons.

Graphene nanoribbons can be folded into a double layer system keeping the two layers decoupled. In the quantum Hall regime folds behave as a new type of Hall bar edge. We show that the symmetry properties of the zero Landau level in metallic nanoribbons dictate that the zero energy edge states traversing a fold are perfectly transmitted onto the opposite layer. This result is valid irrespective...

Interacting electrons in graphene nanoribbons in the lowest Landau level