Transport Controlled By Poincare Orbit Topology In A Driven Inhomogeneous Lattice Gas
PHYSICAL REVIEW RESEARCH(2020)
摘要
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 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 Poincare orbits controls the transport dynamics.
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关键词
poincaré orbit topology,transport,inhomogeneous
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