Eur. Phys. J. B (2013) 86: 77
https://doi.org/10.1140/epjb/e2012-31019-9

Regular Article

Giant persistent current in an open mesoscopic ring

¹ MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, P.R. China
² School of Physical Education and Sports Science, South China Normal University, Guangzhou 510006, P.R. China

^a e-mail: xbyang@scnu.edu.cn, xiangbo.yang@yahoo.com.cn

Received: 8 November 2012
Received in final form: 15 December 2012
Published online: 1 March 2013

Abstract

In this paper we obtain a giant persistent current (PC) in an open mesoscopic ring. Using eigenfunction method we calculate the PC and get the fitting formulae for the maximum amplitudes of PC. The numerical results show that even in the absence of external magnetic field and impurity, our designed simple mesoscopic system can still generate a huge PC which is more than one order of magnitude larger than those produced by the mesoscopic rings reported previously. It may be useful for the designing of microcircuits with large electric current. Furthermore, we deduce two experimental optimal selectable mesoscopic rings.