The Aharonov-Anandan current induced by a time-dependent magnetic flux in graphene rings
1 Department of Applied Physics, School of Science, Xi'an Jiaotong University - 710049, Xi'an, China
2 MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University Xi'an 710049, China
Received: 18 June 2013
Accepted: 6 September 2013
We investigate the current response of a graphene ring in the presence of a time-dependent magnetic flux. Using the linear response theory, we find a nonzero Aharonov-Anandan (AA) phase of carriers in the ring. When the flux increases, the current responses to the flux nonlinearly, which can be applied to translate the external flux signal to the electronic signal. Especially for the huge flux with low frequency, this system can be used as an electronic current square-wave generator. Moreover, a resonant transition can occur in the case of the flux with the proper frequency. And then a current beat frequency phenomenon is observed.
PACS: 81.05.ue – Graphene / 73.23.Ra – Persistent currents / 03.65.Vf – Phases: geometric; dynamic or topological
© EPLA, 2013