### 抜粋

A field-dependent su(2) gauge transformation connects between the adiabatic and diabatic pictures in the (Landau-Zener-Stueckelberg) potential curve crossing. It is pointed out that weak and strong potential curve crossing interactions are interchanged under this transformation, thus realizing a naive strong and weak duality. A reliable perturbation theory should thus be formulated in limits of both weak and strong interactions. In fact, the main characteristics of the potential crossing phenomena such as the Landau-Zener formula including its numerical coefficient are well described by simple (time-independent) perturbation theory without referring to Stokes phenomena. We also show that quantum coherence in a double-well potential is generally suppressed by the effect of a potential curve crossing, which is analogous to the effect of Ohmic dissipation on quantum coherence.

元の言語 | 英語 |
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ページ（範囲） | 3436-3445 |

ページ数 | 10 |

ジャーナル | Physical Review A - Atomic, Molecular, and Optical Physics |

巻 | 56 |

発行部数 | 5 |

DOI | |

出版物ステータス | 出版済み - 1 1 1997 |

外部発表 | Yes |

### All Science Journal Classification (ASJC) codes

- Atomic and Molecular Physics, and Optics