Controlling the Momentum Current of an Off-resonant Ratchet
arXiv:1210.6025 · doi:10.1103/PhysRevA.86.043617
Abstract
We experimentally investigate the phenomenon of a quantum ratchet created by exposing a Bose-Einstein Condensate to short pulses of a potential which is periodic in both space and time. Such a ratchet is manifested by a directed current of particles, even though there is an absence of a net bias force. We confirm a recent theoretical prediction [M. Sadgrove and S. Wimberger, New J. Phys. \textbf{11}, 083027 (2009)] that the current direction can be controlled by experimental parameters which leave the underlying symmetries of the system unchanged. We demonstrate that this behavior can be understood using a single variable containing many of the experimental parameters and thus the ratchet current is describable using a single universal scaling law.
arXiv admin note: substantial text overlap with arXiv:1210.5657
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- Steering random walks with kicked ultracold atoms
- Fidelity of the quantum delta-kicked accelerator
- Applications of fidelity measures to complex quantum systems
- Spontaneous Emission in Quantum Walks of a Kicked Bose-Einstein Condensate
- Engineering transport by concatenated maps