Fig. 1: Berry phase occurring in Möbius- and curved-strip microcavities.
From: Experimental observation of Berry phases in optical Möbius-strip microcavities
Top: parallel transport of a vector along Möbius- and curved-strip cavities leads to a vector flip (occurrence of Berry phase π, dashed violet ellipse) and vector match (no Berry phase), respectively. Bottom: corresponding vector transport evolution on the Poincaré sphere with/without solid angle for the Möbius/curved strips.
