The Fractional Quantum Hall Effect on a Lattice

Details The Fractional Quantum Hall Effect on a Lattice The Fractional Quantum Hall Effect on a Lattice

1994-07-04

arxiv.org/abs/cond-mat/9407014v1

Physics

Condensed Matter

11 pages, Latex, 3 compressed and uuencoded postscript figures appended, FFA-94-02

Scientific paper

10.1103/PhysRevB.51.1605

Starting from the Hofstadter butterfly, we define lattice versions of Landau levels as well as a continuum limit which ensures that they scale to continuum Landau levels. By including a next-neighbor repulsive interaction and projecting onto the lowest lattice Landau level, we show that incompressible ground states exist at filling fractions, $\nu = 1/3, 2/5 $ and $3/7$. Already for values of $l_0/a \sim 2$ where $l_0$ ($a$) is the magnetic length (lattice constant), the lattice version of the $\nu = 1/3$ state reproduces with nearly perfect accuracy the the continuum Laughlin state. The numerical data strongly suggests that at odd filling fractions of the lowest lattice Landau level, the lattice constant is an irrelevant length scale. We find a new relation between the hierarchy of incompressible states and the self-similar structure of the Hofstadter butterfly.

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