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Dynamics in one-dimensional chains of bosons

Event Details

Event Dates: 

Wednesday, April 23, 2014 - 12:30pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Prof. Dr. Hanns-Christoph Naegerl

Speaker Affiliation(s): 

Institute for Experimental Physics,University of Innsbruck
Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Public Seminar

Event Details & Abstract: 

Ultracold atoms are an ideal setting to study non-equilibrium quantum many-body dynamics in a very controlled way. I will present a series of experiments in the context of strongly correlated atomic bosons in one-dimensional geometry. Specifically, we study the dynamics of one-dimensional chains after a sudden quench of the system’s Hamiltonian, for which we independently control J, the (coherent) tunneling rate, U, the strength of the interaction, and E, a tilt along the longitudinal direction of the chains. For a quench to U≈E we couple to nearest neighbors collectively and observe characteristic oscillations in the number of double occupancies that we analyze in the many-body context [1]. For U/2≈E, U/3≈E etc. we observe collective long-range tunneling to next-nearest neighbors and beyond. In particular, for U/3≈E we observe dynamics due to the higher-order super-exchange interaction scaling as J^3/U^2 [2]. For J≈U<