NATURE PHYSICS

XU SG, AL EZZI MM, BALAKRISHNAN N, GARCIARUIZ A, TSIM B, MULLAN C, BARRIER J, XIN N, PIOT BA, TANIGUCHI T, WATANABE K, CARVALHO A, MISHCHENKO A, GEIM AK, FAL KO VI, ADAM S, NETO AHC, NOVOSELOV KS, SHI YM

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

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