Abstract
We propose an experiment to demonstrate a novel blockade mechanism caused by
long-range anisotropic interactions in an ultracold dipolar gas composed of the
recently observed "butterfly" Rydberg molecules. At the blockade radius, the
strong intermolecular interaction between two adjacent molecules shifts their
molecular states out of resonance with the photoassociation laser, preventing
their simultaneous excitation. When the molecules are prepared in a
quasi-one-dimensional (Q1D) trap, the interaction's strength can be tuned via a
weak external field. The molecular density thus depends strongly on the angle
between the trap axis and the field. The available Rydberg and molecular states
provide a wide range of tunability.
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