Aharonov–Bohm oscillations measured in GaAs two-dimensional holes: observation of Berryʹs phase

Fourier spectra of the Aharonov–Bohm oscillations, measured in GaAs two-dimensional holes with a strong spin–orbit interaction, reveal side peaks in addition to the center peak whose frequency corresponds to the radius of the ring. A comparison of the experimental data with results of simulations demonstrates that the origin of the side peaks is the Berryʹs phase.