Robust Weyl points in a 1D superlattice with transverse spin-orbit coupling
arXiv:1906.06820 · doi:10.1103/PhysRevA.102.033339
Abstract
Weyl points, synthetic magnetic monopoles in the 3D momentum space, are the key features of topological Weyl semimetals. The observation of Weyl points in ultracold atomic gases usually relies on the realization of high-dimensional spin-orbit coupling (SOC) for two pseudospin states (% \textit{i.e.,} spin-1/2), which requires complex laser configurations and precise control of laser parameters, thus has not been realized in experiment. Here we propose that robust Wely points can be realized using 1D triple-well superlattices (spin-1/three-band systems) with 2D transverse SOC achieved by Raman-assisted tunnelings. The presence of the third band is responsible to the robustness of the Weyl points against system parameters (e.g., Raman laser polarization, phase, incident angle, etc.). Different from a spin-1/2 system, the non-trivial topology of Weyl points in such spin-1 system is characterized by both the spin vector and tensor textures, which can be probed using momentum-resolved Rabi spectroscopy. Our proposal provides a simple yet powerful platform for exploring Weyl physics and related high-dimensional topological phenomena using high pseudospin ultracold atoms.
4 pages, 4 figures, and Supplementary Materials
References in corpus (16)
- Measuring the Chern number of Hofstadter bands with ultracold bosonic atoms
- Topological response in Weyl semimetals and the chiral anomaly
- Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas
- Observation of the supersolid stripe phase in spin-orbit coupled Bose-Einstein condensates
- Synthetic dimensions and spin-orbit coupling with an optical clock transition
- Spin-orbit coupled fermions in an optical lattice clock
- Chiral anomaly, Charge Density Waves, and Axion Strings from Weyl Semimetals
- Topological Triply Degenerate Points Induced by Spin-Tensor-Momentum Couplings
- Constructing a Weyl semimetal by stacking one dimensional topological phases
- Type-II Weyl Points in Three-Dimensional Cold Atom Optical Lattices
- Representation of Berry phase by the trajectories of Majorana stars
- Spin-1 Topological Monopoles in Parameter Space of Ultracold Atoms
- Exploring Non-Abelian Geometric Phases in Spin-1 Ultracold Atoms
- Electromagnetic fields induced by an electric charge near a Weyl semimetal
- Rashba and Weyl spin-orbit coupling in an optical lattice clock
- Quantum spiral spin-tensor magnetism