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Unconventional magnetism in dissipative atomic systems

April 14, 2014 - 2:00pm
Tony Lee
Harvard University

Cold atoms provide an opportunity to see new collective behavior far from equilibrium, since atomic systems are intrinsically dissipative due to spontaneous emission. I discuss the anisotropic XY model in the presence of spontaneous emission on every atom. It turns out that dissipation enriches the phase diagram, creating new phases like a spin-density-wave phase and a staggered-XY phase [1]. Cold atoms can also simulate non-Hermitian Hamiltonians in a manner similar to heralded entanglement protocols. This leads to unusual behavior like sharp transitions for two atoms and quasi-long-range order in the absence of a continuous symmetry [2]. I also discuss implementation with trapped ions, cavity QED, and atoms in optical lattices.

 [1] T.E. Lee, S. Gopalakrishnan, and M.D. Lukin, Phys. Rev. Lett. 110, 257204 (2013)

[2] T.E. Lee and C.-K. Chan, arXiv:1402.6700

Host: Anzi Hu 

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College Park, MD 20742