Multi-frequency optical lattice for dynamic lattice-geometry control
arXiv:2207.03811 · doi:10.1103/PhysRevResearch.4.043083
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.
18 pages, 13 figures
References in corpus (15)
- Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
- Controlled exchange interaction between pairs of neutral atoms in an optical lattice
- A lattice of double wells for manipulating pairs of cold atoms
- Orbital superfluidity in the -band of a bipartite optical square lattice
- Multi-Component Quantum Gases in Spin-Dependent Hexagonal Lattices
- Topological Photonic Quasicrystals: Fractal Topological Spectrum and Protected Transport
- Orbital analogue of quantum anomalous Hall effect in -band systems
- Observing Chiral Superfluid Order by Matter-Wave Interference
- Low-entropy states of neutral atoms in polarization-synthesized optical lattices
- Imaging the collective excitations of an ultracold gas using statistical correlations
- Probing the bond order wave phase transitions of the ionic Hubbard model by superlattice modulation spectroscopy
- Phasonic Spectroscopy of a Quantum Gas in a Quasicrystalline Lattice
- Two-dimensional optical quasicrystal potentials for ultracold atom experiments
- Quantum degenerate Fermi gas in an orbital optical lattice
- Enhanced principle component method for fringe removal in cold atom images