title: Selective Population of Edge States in a 2D Topological Band System.
abstract: We consider a system of interacting spin-one atoms in a hexagonal lattice under the presence of a synthetic gauge field. Quenching the quadratic Zeeman field is shown to lead to a dynamical instability of the edge modes. This, in turn, leads to a spin current along the boundary of the system which grows exponentially fast in time following the quench. Tuning the magnitude of the quench can be used to selectively populate edge modes of different momenta. Implications of the intrinsic symmetries of the Hamiltonian on the dynamics are discussed. The results hold for atoms with both antiferromagnetic and ferromagnetic interactions.
authors.affiliation: Department of Mathematics, Imperial College London, London SW7 2AZ, United Kingdom.
authors.forename: Bogdan
authors.initials: B
authors.lastname: Galilo
authors.affiliation: Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom.
authors.forename: Derek K K
authors.initials: DK
authors.lastname: Lee
authors.affiliation: Department of Mathematics, Imperial College London, London SW7 2AZ, United Kingdom.
authors.forename: Ryan
authors.initials: R
authors.lastname: Barnett