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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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    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)

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    Observation of tunneling and magneto-tunneling out of a 2D Wigner crystal

    We measured the escape rates of surface state electrons from an electron layer confined at the liquid helium-vacuum interface in the temperature range of 30–450mK, and for densities 0.02–2.2×108 cm −2. Below 200m...

    S. Yücel, L. Menna, E. Y. Andrei in Journal of Low Temperature Physics (1992)