Multi-frequency optical lattice for dynamic lattice-geometry control
- URL: http://arxiv.org/abs/2207.03811v1
- Date: Fri, 8 Jul 2022 10:41:08 GMT
- Title: Multi-frequency optical lattice for dynamic lattice-geometry control
- Authors: Marcel N. Kosch, Luca Asteria, Henrik P. Zahn, Klaus Sengstock,
Christof Weitenberg
- Abstract summary: We introduce a multi-frequency lattice for fast and flexible lattice-geometry control.
We demonstrate it for a three-beam lattice, realizing the full dynamical tunability between honeycomb lattice, boron-nitride lattice and triangular lattice.
This scheme will allow further applications such as novel Floquet and quench protocols to create and probe, e.g., topological properties.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Ultracold atoms in optical lattices are pristine model systems with a
tunability and flexibility that goes beyond solid-state analogies, e.g.,
dynamical lattice-geometry changes allow tuning a graphene lattice into a
boron-nitride lattice. However, a fast modulation of the lattice geometry
remains intrinsically difficult. Here we introduce a multi-frequency lattice
for fast and flexible lattice-geometry control and demonstrate it for a
three-beam lattice, realizing the full dynamical tunability between honeycomb
lattice, boron-nitride lattice and triangular lattice. At the same time, the
scheme ensures intrinsically high stability of the lattice geometry. We
introduce the concept of a geometry phase as the parameter that fully controls
the geometry and observe its signature as a staggered flux in a momentum space
lattice. Tuning the geometry phase allows to dynamically control the sublattice
offset in the boron-nitride lattice. We use a fast sweep of the offset to
transfer atoms into higher Bloch bands, and perform a new type of Bloch band
spectroscopy by modulating the sublattice offset. Finally, we generalize the
geometry phase concept and the multi-frequency lattice to three-dimensional
optical lattices and quasi-periodic potentials. This scheme will allow further
applications such as novel Floquet and quench protocols to create and probe,
e.g., topological properties.
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