Characterizing the Hofstadter butterfly's outline with Chern numbers
arXiv:0808.1440 · doi:10.1088/0953-4075/42/5/055302
Abstract
In this work, we report original properties inherent to independent particles subjected to a magnetic field by emphasizing the existence of regular structures in the energy spectrum's outline. We show that this fractal curve, the well-known Hofstadter butterfly's outline, is associated to a specific sequence of Chern numbers that correspond to the quantized transverse conductivity. Indeed the topological invariant that characterizes the fundamental energy band depicts successive stairways as the magnetic flux varies. Moreover each stairway is shown to be labeled by another Chern number which measures the charge transported under displacement of the periodic potential. We put forward the universal character of these properties by comparing the results obtained for the square and the honeycomb geometries.
Accepted for publication in J. Phys. B (Jan 2009)
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Cited by in corpus (6)
- Ultracold atomic gases in non-Abelian gauge potentials: The case of constant Wilson loop
- Ultracold atomic gas in non-Abelian "magnetic" fields: the quantum Hall effect supremacy
- Universality of Hofstadter butterflies on hyperbolic lattices
- Topological multi-mode waveguide QED
- Anomalous charge pumping in a one-dimensional optical superlattice
- Polarization as a topological quantum number in graphene