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Location of crossings in the Floquet spectrum of a driven two-level system



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Creffield, Charles E. (2004) Location of crossings in the Floquet spectrum of a driven two-level system. Physical review B, 67 (16). pp. 19-22. ISSN 1098-0121

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URL Oficial: http://dx.doi.org/10.1103/PhysRevB.67.165301

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The calculation of the Floquet quasi-energies of a system driven by a time-periodic field is an efficient way to understand its dynamics. In particular, the phenomenon of dynamical localization can be related to the presence of close approaches between quasienergies (either crossings or avoided crossings). Here we consider a driven two-level system and study how the locations of crossings in the quasienergy spectrum alter as the field parameters are changed. A perturbational scheme provides a direct connection between the form of the driving field and the quasienergies which is exact in the limit of high frequencies. We first obtain relations for the quasienergies for some common types of applied field in the high-frequency limit, and then show how the locations of the crossings drift as the frequency is reduced. We find a simple empirical formula which describes this drift extremely well in general, and which we conjecture is exact for the specific case of square-wave driving

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©2003 The American Physical Society.
This research was supported by the EU through the TMR program ‘‘Quantum Electron Transport in the Frequency and Time Domains.’’ The author thanks Gloria Platero for discussions, and acknowledges the hospitality of the International Institute for Applied Systems Analysis (IIASA) in Vienna, where part of this work was carried out.

Palabras clave:Dynamics
Materias:Ciencias > Física > Física de materiales
Ciencias > Física > Física del estado sólido
Código ID:33624
Depositado:19 Oct 2015 17:44
Última Modificación:08 Feb 2018 15:07

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