Model study of the Landau–Zener approximation

Model study of the Landau–Zener approximation
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朗道-齐纳近似的模型研究

DOI:
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发表时间:
2005
期刊:
影响因子:
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通讯作者:
Nathan D. Aragon
Nathan D. Aragon
中科院分区:
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文献类型:
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作者:
S. Geltman;Nathan D. Aragon

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我们重新审视了Landau-Zener近似的准确性,其分析的简单性使得它在过去的70年里经常被引用和应用于描述非绝热相变。我们发现,这种近似可能在很大程度上不符合精确的数值结果的模型物理系统和广泛的耦合强度和相对速度。我们的结论是,朗道-齐纳近似应谨慎使用非绝热跃迁概率或截面的定量估计。
We reexamine the accuracy of the Landau–Zener approximation, whose analytic simplicity has made it often cited and applied over the past 70years in describing nonadiabatic transitions. We find that this approximation may be in substantial disagreement with exact numerical results for a model physical system and a wide range of coupling strengths and relative velocities. We conclude that the Landau–Zener approximation should be used with caution for quantitative estimates of nonadiabatic transition probabilities or cross sections.