Topological force and torque in spin-orbit coupling systemsF. J. Huang1, 2, R. Qi1, Y. D. Li2 and W. M. Liu1
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics Chinese Academy of Sciences - Beijing 100080, China
2 School of Physics, Yunnan University - Kunming 650091, China
received 13 March 2007; accepted in final form 22 May 2007; published July 2007
published online 14 June 2007
The topological force and torque are investigated in systems with spin-orbit coupling. It is demonstrated that the topological force and torque appears as a pure relativistic quantum effect in an electromagnetic field. The origin of both topological force and torque is the Zitterbewegung effect. Considering nonlinear behaviors of spin-orbit coupling, we address possible novel phenomena driven by the topological forces.
03.65.Pm - Relativistic wave equations.
72.10.Bg - General formulation of transport theory.
71.70.Ej - Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect.
© Europhysics Letters Association 2007