Magnetoconductance Oscillations and Evidence for Fractional Quantum Hall States in Suspended Bilayer and Trilayer Graphene

Wenzhong Bao, Zeng Zhao, Hang Zhang, Gang Liu, Philip Kratz, Lei Jing, Jairo Velasco, Dmitry Smirnov, Chun Ning Lau
2010 Physical Review Letters  
We report pronounced magnetoconductance oscillations observed on suspended bilayer and trilayer graphene devices with mobilities up to 270,000 cm2/Vs. For bilayer devices, we observe conductance minima at all integer filling factors nu between 0 and -8, as well as a small plateau at ν=1/3. For trilayer devices, we observe features at nu=-1, -2, -3 and -4, and at ν 0.5 that persist to 4.5K at B=8T. All of these features persist for all accessible values of Vg and B, and could suggest the onset
more » ... symmetry breaking of the first few Landau (LL) levels and fractional quantum Hall states.
doi:10.1103/physrevlett.105.246601 pmid:21231541 fatcat:heuvvjzxxfddrphctu7r2jo72q