Orbital optical Raman lattice
Phys. Rev. A 113, 023301 – Published 2 February, 2026
DOI: https://doi.org/10.1103/zdrw-kcpf
Abstract
The spin and orbital are two basic degrees of freedom that play significant roles in exploring exotic quantum phases in optical lattices with synthetic spin-orbit coupling (SOC) and high-orbital bands, respectively. Here, we combine these two crucial ingredients by proposing an alternative orbital optical Raman lattice scheme to explore exotic high-orbital Bose condensates with Raman-induced SOC in a square lattice. We find that both the SOC and -orbital interactions influence the condensed state of bosons. Their interplay results in two novel high-orbital many-body quantum phases: a uniform angular momentum superfluid phase, which exhibits a global topological chiral orbital current characterized by a uniform Chern number, and a two-dimensional topological spin-orbital supersolid phase, which is characterized by the spin and orbital angular momentum density-wave patterns and by the chiral and antichiral topological edge excitations with a staggered Chern-number distribution as predicted here for supersolid phases. Our scheme may open a new avenue for exploring exotic SOC and high-orbital physics in optical lattices and is expected to advance the experimental realization of novel supersolids in higher dimensions.
