From dia- to paramagnetic orbital susceptibility of Dirac cones

Abstract

We study the orbital susceptibility of coupled energy bands with a pair of Dirac points, as in graphene. We show that different systems having the same zero-field energy spectrum exhibit strong differences in their orbital magnetic response at zero energy, ranging from diamagnetism (graphene) to paramagnetism (dice lattice). A lattice model is introduced which interpolates continuously between these two limits. This striking behavior is related to a Berry phase varying continuously from pi to 0. These predictions could be tested with cold atoms in an optical lattice

5 pages, 10 figures, supplementary material

References in corpus (8)

• The electronic properties of graphene
• Realization of the Hofstadter Hamiltonian with ultracold atoms in optical lattices
• Realizing the Harper Hamiltonian with Laser-Assisted Tunneling in Optical Lattices
• Tilted anisotropic Dirac cones in quinoid-type graphene and alpha-(BEDT-TTF)_2I_3
• Limits on intrinsic magnetism in graphene
• Thermodynamic Measurements in a Strongly Interacting Fermi Gas
• Orbital magnetism of graphene flakes
• Quantum oscillations in ultracold Fermi gases : realizations with rotating gases or artificial gauge fields

Cited by in corpus (135)

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