▎ 摘　　要

We report pronounced magnetoconductance oscillations observed on suspended bilayer and trilayer graphene devices with mobilities up to 270000 cm(2)/V s. For bilayer devices, we observe conductance minima at all integer filling factors v between 0 and -8, as well as a small plateau at v = 1/3. For trilayer devices, we observe features at v = -1, -2, -3, and -4, and at v similar to 0.5 that persist to 4.5 K at B 8 T. All of these features persist for all accessible values of V-g and B, and could suggest the onset of symmetry breaking of the first few Landau levels and fractional quantum Hall states.