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Citation: Li Yu-Hui, Yan Yun-An, Shao Jiu-Shu. Dynamical Localization of Two-level Systems[J]. Acta Physico-Chimica Sinica, ;2004, 20(08S): 1037-1044. doi: 10.3866/PKU.WHXB200408zk22 shu

Dynamical Localization of Two-level Systems

1.
State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing　100080

Received Date: 12 January 2004
Available Online: 15 August 2004

This paper reviews our work on dynamical localization of the two-level system (TLS). By mapping the quantum dynamics of a driven TLS to the classical one of a particle experiencing a two-dimensional harmonic force as well as a periodic magnetic field, deep insights into the mechanism of localization have been gained. Using this scheme we are able to obtain the condition for localization of a TLS subject to the linearly polarized field. The localization induced by δ-function pulses and circularly polarized fields has been analytically investigated. It is found that the circularly-polarized-field induced localization can be fully described by the geometry of an ellipse within a unit circle on a complex plane.
- Two-level system;Tunneling;Localization;Linearly polarized field;　Circularly polarized field
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