Transport controlled by Poincar\'e orbit topology in a driven inhomogeneous lattice gas

• URL: http://arxiv.org/abs/2006.01612v1
• Date: Tue, 2 Jun 2020 13:57:12 GMT
• Title: Transport controlled by Poincar\'e orbit topology in a driven inhomogeneous lattice gas
• Authors: Alec Cao, Roshan Sajjad, Ethan Q. Simmons, Cora J. Fujiwara, Toshihiko Shimasaki, David M. Weld
• Abstract summary: In periodic quantum systems, the interplay between drive and Bloch oscillations controls transport dynamics. We show that inhomogeneity of the applied force leads to a rich new variety of dynamical behaviors controlled by the drive phase.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In periodic quantum systems which are both homogeneously tilted and driven, the interplay between drive and Bloch oscillations controls transport dynamics. Using a quantum gas in a modulated optical lattice, we show experimentally that inhomogeneity of the applied force leads to a rich new variety of dynamical behaviors controlled by the drive phase, from self-parametrically-modulated Bloch epicycles to adaptive driving of transport against a force gradient to modulation-enhanced monopole modes. Matching experimental observations to fit-parameter-free numerical predictions of time-dependent band theory, we show that these phenomena can be quantitatively understood as manifestations of an underlying inhomogeneity-induced phase space structure, in which topological classification of stroboscopic Poincar\'e orbits controls the transport dynamics.

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