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Phys. Rev. A 60, R4225–R4228 (1999)

Two-color control of localization: From lattices to spin systems

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Joanna Karczmarek1,2, Malcolm Stott2, and Misha Ivanov1
1Steacie Institute for Molecular Science, NRC, 100 Sussex Drive, Ottawa, Ontario, Canada K1A 0R6
2Physics Department, Queen’s University, Kingston, Ontario, Canada K7L 3N6

Received 13 July 1999; published in the issue dated December 1999

We demonstrate control of quantum dynamics in a finite model system described by a tight-binding Hamiltonian, through interaction with a multifrequency external field. Effective defects can be introduced into the lattice by a two-frequency field, and the character of the defects can be controlled by the relative phase between the two field components. These field-induced defects imply robust localization of dressed (Floquet) states on lattice sites. Implications for a spin system in crossed magnetic fields are discussed.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.60.R4225
DOI:
10.1103/PhysRevA.60.R4225
PACS:
42.50.Hz
 
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