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SUMMARY:Marginal Fermi liquid behaviour and competing orders with topologi
 cal  characteristics in bilayer graphene. - Rahul Nandkishore\, Massachuse
 tts Institute of Technology
DTSTART:20100730T143000Z
DTEND:20100730T153000Z
UID:TALK25589@talks.cam.ac.uk
CONTACT:Dr Jonathan Keeling
DESCRIPTION:I will provide a brief overview of my recent research (with Le
 onid \nLevitov) on the effects of electron-electron interactions in bilaye
 r \ngraphene (BLG). I will show using a renormalisation group approach tha
 t \nBLG behaves at leading order as a marginal fermi liquid\, and I will \
 ndiscuss the possible experimental signatures. I will then show that at \n
 lower temperatures BLG displays a weak coupling instability to various \nb
 roken symmetry ordered phases\, which may be investigated in a saddle \npo
 int plus quadratic fluctuations approach. I will illustrate how these \nph
 ases may be classified using a hidden SU(4) symmetry\, and will point \nou
 t that they have topological characteristics. I will conclude with \npropo
 sing a phase diagram for BLG.\n\nReferences\,\n\nR. Nandkishore and L. Lev
 itov\, "arXiv: 1006.1136":http://www.arxiv.org/abs/1006.1136\, "Phys Rev. 
 Lett 104\, 156803 (2010)":http://dx.doi.org/10.1103/PhysRevLett.104.156803
 \, "arXiv: 1002.1966":http://www.arxiv.org/abs/1002.1966
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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