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The phase of a quantum state may not return to its original value after thesystem's parameters cycle around a closed path; instead, the wavefunction mayacquire a measurable phase difference called the Berry phase. Berry phasestypically have been accessed through interference experiments. Here, wedemonstrate an unusual Berry-phase-induced spectroscopic feature: a sudden andlarge increase in the energy of angular-momentum states in circular graphenep-n junction resonators when a small critical magnetic field is reached. Thisbehavior results from turning on a $\pi$-Berry phase associated with thetopological properties of Dirac fermions in graphene. The Berry phase can beswitched on and off with small magnetic field changes on the order of 10 mT,potentially enabling a variety of optoelectronic graphene device applications.

An On/Off Berry Phase Switch in Circular Graphene Resonators