Authors: L Martina
Publish Date: 2008/07/22
Volume: 151, Issue: 4, Pages: 3159-3166
Abstract
Semiclassical wave packets for electrons in crystals subject to an external electromagnetic field satisfy Hamiltonian equations In 2+1dimensions and in the limit of uniform fields the symmetry group results in a twofolded Galilei algebra incorporating an “exotic” central charge It has the physical meaning of the Berryphase curvature In the Hamiltonian scheme we discuss possible deformations of that algebra and the physical meaning
Keywords: