Realizing Fractional Chern Insulators with Dipolar Spins

TitleRealizing Fractional Chern Insulators with Dipolar Spins
Publication TypeJournal Article
Year of Publication2013
AuthorsYao, NY, Gorshkov, AV, Laumann, CR, Läuchli, AM, Ye, J, Lukin, MD
JournalPhysical Review Letters
Date Published2013/4/29

Strongly correlated quantum systems can exhibit exotic behavior controlled by
topology. We predict that the \nu=1/2 fractional Chern insulator arises
naturally in a two-dimensional array of driven, dipolar-interacting spins. As a
specific implementation, we analyze how to prepare and detect synthetic gauge
potentials for the rotational excitations of ultra-cold polar molecules trapped
in a deep optical lattice. While the orbital motion of the molecules is pinned,
at finite densities, the rotational excitations form a fractional Chern
insulator. We present a detailed experimental blueprint for KRb, and
demonstrate that the energetics are consistent with near-term capabilities.
Prospects for the realization of such phases in solid-state dipolar systems are
discussed as are their possible applications.

Short TitlePhys. Rev. Lett.