Fig. 2: Acquisition of W.-Z. phase within the DS.
From: Wilson loop and Wilczek-Zee phase from a non-Abelian gauge field
a Bloch vector within the DS before (blue arrows) and after (red arrows) adiabatically following paths \({{{{\mathcal{C}}}}}_{\pm }\), which traced the same loop with opposite direction (inset). The initial Bloch vector was \(\langle \hat{{{{\boldsymbol{\sigma }}}}}\rangle =(0,0,1)\) and the path-dependent final Bloch vectors were \(\langle {\hat{{{{\boldsymbol{\sigma }}}}}}_{+}\rangle =(-0.62(3),-0.70(5),0.47(2))\) and \(\langle {\hat{{{{\boldsymbol{\sigma }}}}}}_{-}\rangle =(-0.68(1),0.59(5),0.40(5))\). The laboratory parameters are ΩA = ΩB = h × 1.4 kHz. b The angle dependence of the final Bloch vectors for paths with forward ramp (left) and reverse ramp (right). The dots are individual data and the solid curves are the theory. The error bars show the standard deviation of the data.
