Volume 79, Number 1, July 2007
Article Number 10004
Number of page(s) 5
Section General
Published online 14 June 2007
EPL, 79 (2007) 10004
DOI: 10.1209/0295-5075/79/10004

Topological force and torque in spin-orbit coupling systems

F. 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