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SUMMARY:Local density of states of electron-crystal phases in graphene in 
 the quantum Hall regime - Oleksandr Poplavskyy (University of Cambridge)
DTSTART:20090522T150000Z
DTEND:20090522T153000Z
UID:TALK17219@talks.cam.ac.uk
CONTACT:Daniel Cole
DESCRIPTION:"O. Poplavskyy\, M. O. Goerbig\, C. Morais Smith":http://arxiv
 .org/abs/0902.1902\n\nWe calculate\, within a self-consistent Hartree-Fock
  approximation\, the local density of states for different electron crysta
 ls in graphene subject to a strong magnetic field. We investigate both the
  Wigner crystal and bubble crystals with M_e electrons per lattice site. T
 he total density of states consists of several pronounced peaks\, the numb
 er of which in the\nnegative energy range coincides with the number of ele
 ctrons M_e per lattice site\, as for the case of electron-solid phases in 
 the conventional\ntwo-dimensional electron gas. Analyzing the local densit
 y of states at the peak energies\, we find particular scaling properties o
 f the density patterns if one fixes the ratio nu_N/M_e between the filling
  factor nu_N of the last partially filled Landau level and the number of e
 lectrons per bubble. Although the total density profile depends explicitly
  on M_e\, the\nlocal density of states of the lowest peaks turns out to be
  identical regardless the number of electrons M_e. Whereas these electron-
 solid phases are reminiscent to those expected in the conventional two-dim
 ensional electron gas in GaAs heterostructures in the quantum Hall regime\
 , the local density of states and the scaling relations we highlight in th
 is paper may be\, in graphene\, directly measured by spectroscopic means\,
  such as e.g. scanning tunneling microscopy.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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