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Session Z27: Invited Session: Interaction Driven Broken Symmetry States in Bilayer Graphene

11:15 AM–2:15 PM, Friday, March 2, 2012
Room: 258AB

Sponsoring Unit: DCMP
Chair: Allan MacDonald, University of Texas at Austin

Abstract ID: BAPS.2012.MAR.Z27.4

Abstract: Z27.00004 : Interaction-Driven Insulating States in Bilayer Graphene

1:03 PM–1:39 PM

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Author:

Chun Ning Lau
(University of California, Riverside)

Bilayer graphene (BLG) at the charge neutrality point (CNP) is unstable to electronic interactions, and expected to host a ground state with spontaneously broken symmetries. Here I will present our transport spectroscopy measurements on singly- and dual-gated suspended BLG devices, which have field effect mobility values up to 250,000 and 100,000 cm$^2$/Vs, respectively. We observe an insulating state at CNP with a gap $\sim $2 meV, which can be closed by elevated temperature, finite doping or a perpendicular electric field of either polarity. For magnetic field B$>$1T, the gap increases linearly with B. Our work contributes towards understanding the rich interaction-driven physics in BLG.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.Z27.4