title: Spin hamiltonian for which the chiral spin liquid is the exact ground state.
abstract: We construct a Hamiltonian that singles out the chiral spin liquid on a square lattice with periodic boundary conditions as the exact and, apart from the twofold topological degeneracy, unique ground state.
authors.affiliation: Department of Physics, Reed College, Portland, Oregon 97202, USA.
authors.forename: Darrell F
authors.initials: DF
authors.lastname: Schroeter
authors.forename: Eliot
authors.initials: E
authors.lastname: Kapit
authors.forename: Ronny
authors.initials: R
authors.lastname: Thomale
authors.forename: Martin
authors.initials: M
authors.lastname: Greiter