Article abstract

Nature Physics 3, 796 - 801 (2007)
Published online: 30 September 2007 | doi:10.1038/nphys730

Subject Categories: Quantum physics | Condensed-matter physics

Anyons in a weakly interacting system

C. Weeks, G. Rosenberg, B. Seradjeh & M. Franz

In quantum theory, indistinguishable particles in three-dimensional space behave in only two distinct ways. On interchange, their wavefunction maps either to itself if the particles are bosons, or to minus itself if they are fermions. In two dimensions, a more exotic possibility arises: on exchange of two particles known as anyons, the wavefunction acquires the phase Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact Such fractional exchange statistics are normally regarded as the hallmark of strong correlations. Here, we describe a theoretical proposal for a system whose excitations are anyons with the exchange phase theta=pi/4 and charge plusminuse/2, but at the same time can be built by filling a set of single-particle states of essentially non-interacting electrons. The system consists of an artificially structured type-II superconducting film adjacent to a two-dimensional electron gas in the integer quantum Hall regime with unit filling fraction. The proposed set-up enables manipulation of these anyons and could prove useful in schemes for fault-tolerant topological quantum computation.

  1. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada

Correspondence to: M. Franz e-mail:


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