Fig. 5
From: Topological characterizations of an extended Su–Schrieffer–Heeger model
a The experimental setup. Our BEC is created in an octagonal chamber. Two dipole trap beams (DT1 and DT2) form the crossed dipole trap. The Raman incoming beam is about 7° off-axis from the beam DT2. The incoming Raman beam and the reflected Raman beam are combined with a polarization beam splitter, they are σ+ and σ− at the chamber center. The probe direction is about 45° with respect to the Raman direction
