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  1. Article

    Observation of Van Hove singularities in twisted graphene layers

    When a Van Hove singularity exists near the Fermi energy of a solid’s density of states, it can cause a variety of exotic phenomena to emerge. Scanning tunnelling microscope measurements indicate that when gra...

    Guohong Li, A. Luican, J. M. B. Lopes dos Santos, A. H. Castro Neto in Nature Physics (2010)

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    Article

    Evidence for a glassy phase in the vortex state of 2H−NbSe2

    We have measured the DC response and RF surface impedance of 2H−NbSe 2 single crystals in fields up to 2 Tesla. The results suggest that there are two distinct states of the vortex lattice; one is...

    W. Henderson, E. Y. Andrei, M. Higgins, S. Bhattacharya in Czechoslovak Journal of Physics (1996)