Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-08-02
PRL 100, 116802 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
Contains are slightly changed. Journal reference and DOI are added
Scientific paper
10.1103/PhysRevLett.100.116802
We report on numerical study of the Dirac fermions in partially filled N=3 Landau level (LL) in graphene. At half-filling, the equal-time density-density correlation function displays sharp peaks at nonzero wavevectors $\pm {\bf q^{*}}$. Finite-size scaling shows that the peak value grows with electron number and diverges in the thermodynamic limit, which suggests an instability toward a charge density wave. A symmetry broken stripe phase is formed at large system size limit, which is robust against purturbation from disorder scattering. Such a quantum phase is experimentally observable through transport measurements. Associated with the special wavefunctions of the Dirac LL, both stripe and bubble phases become possible candidates for the ground state of the Dirac fermions in graphene with lower filling factors in the N=3 LL.
Haldane Duncan F. M.
Sheng Donna N.
Sheng Leimei
Wang Hao
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