R. G. Herb Condensed Matter Seminars |
Events During the Week of December 10th through December 17th, 2017
Monday, December 11th, 2017
- No events scheduled
Tuesday, December 12th, 2017
- No events scheduled
Wednesday, December 13th, 2017
- No events scheduled
Thursday, December 14th, 2017
- Graphene in the extreme quantum limit
- Time: 10:00 am
- Place: 5310 Chamberlin Hall
- Speaker: Cory Dean, Columbia University
- Abstract: Soon after the discovery of monolayer graphene, it was shown that bilayer graphene (BLG), consisting of two bernal stacked monolayers, could theoretically support an even-denominator fractional quantum Hall state equivalent to the 5/2 Moore-Read Pfaffian first identified in GaAs . Owing to the unique landau level spectrum in BLG, the Pfaffian in this system is expected to be tunable by electric and magnetic fields, with the potential to be stronger than in GaAs for accessible field parameters. In my talk I will discuss recent magnetotransport studies of high mobility, BLG. Utilizing a dual gate geometry to tune through different orbital and layer polarizations, we find four even denominator states appearing within the N = 1 orbital branches of the lowest LL. We investigate how these states evolve with varying parameters and provide the first mapping of the B – D phase diagram. Our results confirm the unique tunability of the even denominator state in BLG, and we reach a regime where the energy gap is found to exceed several kelvin. I will also present recent measurements of bilayer systems in which we separate the two layers by a thin BN spacer. Here, by tuning the interlayer interaction strength via the layer separation, we are able to stabilize new correlated states in the double layer systems formed from interlayer excitons.
- Host: Alex Levchenko
Friday, December 15th, 2017
- No events scheduled