Landau levels in the case of two degenerate coupled bands: Kagomé lattice tight-binding spectrum

Yi Xiao, Vincent Pelletier, Paul M. Chaikin, David A. Huse

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The spectrum of charged particles hopping on a kagomé lattice in a uniform transverse magnetic field shows an unusual set of Landau levels at low field. They are unusual in two respects: the lowest Landau levels are paramagnetic so their energies decrease linearly with increasing field magnitude, and the spacings between the levels are not equal. These features are shown to follow from the degeneracy of the energy bands in zero magnetic field. We give a general discussion of Landau levels in the case of two degenerate bands and show how the kagomé lattice tight-binding model includes one special case of this more general problem. We also discuss the consequences of this for the behavior of the critical temperature of a kagomé grid superconducting wire network, which is the experimental system that originally motivated this work.

    Original languageEnglish (US)
    Article number104505
    Pages (from-to)1045051-1045059
    Number of pages9
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume67
    Issue number10
    StatePublished - Mar 15 2003

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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