Semiclassical quantization of skipping orbits

Abstract

We propose a simple description of the spectrum of edge states in the quantum Hall regime, in terms of semiclassical quantization of skipping orbits along hard wall boundaries, $\mathcal{A}=2\pi (n+\gamma ){\ell }_B^2$, where $\mathcal{A}$ is the area enclosed between a skipping orbit and the wall and ${\ell }_B$ is the magnetic length. Remarkably, this description provides an excellent quantitative agreement with the exact spectrum. We discuss the value of $\gamma$ when the skipping orbits touch one or two edges, and its variation when the orbits graze the edges and the semiclassical quantization has to be corrected by diffraction effects. The value of $\gamma$ evolves continuously from $1/2$ to $3/4$. We calculate the energy dependence of the drift velocity along the different Landau levels. We compare the structure of the semiclassical cyclotron orbits, their position with respect to the edge, to the wave function of the corresponding eigenstates.

9 pages, 16 figures

References in corpus (4)

• Electronic States of Graphene Nanoribbons
• WKB analysis of edge states in graphene in a strong magnetic field
• Magnetic focusing in normal-superconductor hybrid systems: a semiclassical analysis
• Semiclassical analysis of edge state energies in the integer quantum Hall effect

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