Abbreviated Journal Title
Phys. Rev. B
Topological Invariant; Conductance; Parameter; Physics; Condensed Matter
Field-theoretical methods have been shown to be useful in constructing simple effective theories for two-dimensional (2D) systems. These effective theories are usually studied by perturbing around a mean-field approximation, so the question as to whether such an approximation is meaningful arises immediately. We here study 2D interacting electrons in a half-filled Landau level mapped onto interacting hard-core bosons in a magnetic field. We argue that an interacting hard-core boson system in a uniform external field such that there is one flux quantum per particle (unit filling) exhibits an integer quantum Hall effect. As a consequence, the mean-field approximation for mapping electrons at half-filling to a boson system at integer filling fails.
Physical Review B
Heinonen, O. and Johnson, M. D., "Integer Quantum Hall Effect For Hard-Core Bosons And A Failure Of Bosonic Chern-Simons Mean-Field Theories For Electrons At A Half-Filled Landau Level" (1996). Faculty Bibliography 1990s. 1639.