title: General approach to quantum-classical hybrid systems and geometric forces.
abstract: We present a general theoretical framework for a hybrid system that is composed of a quantum subsystem and a classical subsystem. We approach such a system with a simple canonical transformation which is particularly effective when the quantum subsystem is dynamically much faster than the classical counterpart, which is commonly the case in hybrid systems. Moreover, this canonical transformation generates a vector potential which, on one hand, gives rise to the familiar Berry phase in the fast quantum dynamics and, on the other hand, yields a Lorentz-like geometric force in the slow classical dynamics.
authors.affiliation: Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhang
authors.forename: Biao
authors.initials: B
authors.lastname: Wu