Fractional quantum Hall phase transitions and four-flux states in graphene.

  title={Fractional quantum Hall phase transitions and four-flux states in graphene.},
  author={Benjamin E Feldman and Andrei J Levin and Benjamin Krauss and Dmitry A. Abanin and Bertrand I Halperin and Jurgen Hubert Smet and Amir Yacoby},
  journal={Physical review letters},
  volume={111 7},
Graphene and its multilayers have attracted considerable interest because their fourfold spin and valley degeneracy enables a rich variety of broken-symmetry states arising from electron-electron interactions, and raises the prospect of controlled phase transitions among them. Here we report local electronic compressibility measurements of ultraclean suspended graphene that reveal a multitude of fractional quantum Hall states surrounding filling factors ν=-1/2 and -1/4. Several of these states… CONTINUE READING
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