Graphene

The study of graphene, a single atomic layer of carbon atoms arranged in a honeycomb lattice, has become an extraordinarily active area of research since the first flakes were experimentally realized in 2004. Early measurements have revealed unique electronic characteristics and high sample quality, a combination that promises applicability across multiple fields, ranging from carbon electronics to chemical sensing to quantum electrodynamics. In our lab, we are now studying both monolayer and bilayer graphene in the form of suspended graphene flakes, as well has graphene which has been encapsulated between two thin layers of hexagonal Boron Nitride (hBN). Both these fabrication methods lead to exceptionally high sample quality and allow us to probe exciting new physics.

Graphene related publications

M.T. Allen, O. Shtanko, I.C. Fulga, A. Akhmerov, K. Watanabi, T. Taniguchi, P. Jarillo-Herrero, L.S. Levitov, and A. Yacoby. "Spatially resolved edge curents and guided-wave electronic states in graphene." Nature Physics (September 28 2015).

M.T. Allen, O. Shtanko, I.C. Fulga, J.I.-J. Wang, D. Nurgaliev, K. Watanabe, T. Taniguchi, A.R. Akhmerov, P. Jarillo-Herrero, L.S. Levitov, A. Yacoby. "Visualization of phase-coherent electron interference in a ballistic graphene Josephson junction." arxiv: 1506.06734 (Submitted June 22 2015).

A. Kou, B.E. Feldman, A.J. Levin, B.I. Halperin, K. Watanabe, T. Taniguchi, A. Yacoby. "Electron- Hole Asymmetric Integer and Fractional Quantum Hall Effect in Bilayer Graphene". Science 1250270. Published online 29 May 2014.

B. E. Feldman, A.J. Levin, B. Krauss, D. Abanin, B.I. Halperin, J.H. Smet, A. Yacoby "Fractional Quantum Hall Phase Transitions and Four-flux Composite Fermions in Graphene" Phys. Rev. Lett. 111, 076802 (2013).

B. E. Feldman, B. Krauss, J. H. Smet, A. Yacoby "Unconventional Sequence of Fractional Quantum Hall States in Suspended Graphene" Science 337 1196-1199 (2012).

M. T. Allen, J. Martin, A. Yacoby "Gate-defined quantum confinement in suspended bilayer graphene" Nature Communications 3, 934 (2012).

R. T. Weitz, M. T. Allen, B. E. Feldman, J. Martin, A. Yacoby, "Broken-Symmetry States in Doubly Gated Suspended Bilayer Graphene", Science 330, 812-816 (2010)

J. Martin, B. E. Feldman, R. T. Weitz, M. T. Allen, A. Yacoby, "Local Compressibility Measurements of Correlated States in Suspended Bilayer Graphene", Phys. Rev. Lett 105 256806 (2010)

B. E. Feldman, J. Martin, A. Yacoby, "Broken-symmetry states and divergent resistance in suspended bilayer graphene", Nature Physics 5, 889-893 (2009)

J. Martin, N. Akerman, G. Ulbricht, T. Lohmann, K. von Klitzing, J. H. Smet, "The nature of localization in graphene under quantum Hall conditions", Nature Physics 5, 669-674 (2009).

J. Martin, N. Akerman, G. Ulbricht, T. Lohmann, J. H. Smet, K. von Klitzing, A. Yacoby, "Observation of electron-hole puddles in graphene using a scanning single-electron transistor", Nature Physics 4, 144-148 (2008).