Minimum requirements for laser-induced symmetry breaking in quantum and classical mechanics

Abstract

Necessary conditions for generating phase controllable asymmetry in spatially symmetric systems using lasers are identified and are shown to be identical in quantum and classical mechanics. First, by studying the exact dynamics of harmonic systems in the presence of an arbitrary radiation field, it is demonstrated that anharmonicities in the system's potential are a necessary requirement for phase controllability. Then, by analyzing the space-time symmetries of the laser-driven Liouville dynamics for classical and quantum systems, a common set of temporal symmetries for the driving field that need to be violated to induce transport are identified. The conditions apply to continuous wave lasers and to symmetry breaking effects that do not rely on the control of the absolute phase of the field. Known examples of laser fields that can induce transport in symmetric systems are seen to be particular cases of these symmetry constraints.

12 pages, to appear in J. Phys. B. (Special issue on Coherent Control, March 2008)

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• Adiabaticity parameters for the categorization of light-matter interaction -- from weak to strong driving
• Electronic coherence dynamics in trans-polyacetylene oligomers
• Certifying The Quantumness of A Generalized Coherent Control Scenario
• Light-field control of real and virtual charge carriers
• Ultrafast Charge Separation Induced by a Uniform Field in Graphene Nanoribbons
• Zero-bias current induced by periodic drive of any shape