Dissipative Quantum Ising model in a cold atomic spin-boson mixture

Details Dissipative Quantum Ising model in a cold atomic spin-boson mixture Dissipative Quantum Ising model in a cold atomic spin-boson mixture

2007-11-14

arxiv.org/abs/0711.2309v3

Phys. Rev. A 77, 051601(R) (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 2 figures, 1 table; Title modified and cosmetic changes

Scientific paper

10.1103/PhysRevA.77.051601

Using cold bosonic atoms with two (hyperfine) ground states, we introduce a spin-boson mixture which allows to implement the quantum Ising model in a tunable dissipative environment. The first specie lies in a deep optical lattice with tightly confining wells and forms a spin array; spin-up/down corresponds to occupation by one/no atom at each site. The second specie forms a superfluid reservoir. Different species are coupled coherently via laser transitions and collisions. Whereas the laser coupling mimics a transverse field for the spins, the coupling to the reservoir sound modes induces a ferromagnetic (Ising) coupling as well as dissipation. This gives rise to an order-disorder quantum phase transition where the effect of dissipation can be studied in a controllable manner.

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