Excitation of Small Quantum Systems by High-Frequency Fields

Details Excitation of Small Quantum Systems by High-Frequency Fields Excitation of Small Quantum Systems by High-Frequency Fields

1996-05-20

arxiv.org/abs/cond-mat/9605116v1

Physics

Condensed Matter

4 pages, revtex, no figures

Scientific paper

10.1103/PhysRevLett.77.3763

The excitation by a high frequency field of multi--level quantum systems with a slowly varying density of states is investigated. A general approach to study such systems is presented. The Floquet eigenstates are characterized on several energy scales. On a small scale, sharp universal quasi--resonances are found, whose shape is independent of the field parameters and the details of the system. On a larger scale an effective tight--binding equation is constructed for the amplitudes of these quasi--resonances. This equation is non--universal; two classes of examples are discussed in detail.

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