arXiv quant-ph/05062372005-06quant-phcond-mat.other

分子磁体晶体的微波辐射--谐振腔的作用

Microwave emission from a crystal of molecular magnets -- The role of a resonant cavity

Mihaly G. Benedict, Peter Foldi, F. M. Peeters

备注：: 12 pages, 6 figures. To appear in Phys. Rev. B
发表信息：: Phys. Rev. B 72, 214430 (2005)
DOI：: 10.1103/PhysRevB.72.214430

摘要：

本文讨论了在磁性分子晶体（如Mn ${}_{12}$ -Ac）的易磁化轴方向上外加一个随时间变化的磁场时，其周围的谐振腔所引起的效应。我们表明，腔场对样品的反作用显着增加了微波发射的可能性。这种辐射过程可以是超辐射或类似脉泽的效应，这取决于失相的强度。我们的模型提供了进一步的洞察力，在最近的实验中观察到的电磁辐射伴随着共振量子隧穿磁化的爆发的理论理解。到目前为止的实验结果都可以解释为微波激射效应，而不是超辐射。我们的理论结果与实验结果相似，即，随着外部磁场的扫描速率的增加，发射峰值向更高的场值移动。

英文摘要：

We discuss the effects caused by a resonant cavity around a sample of a magnetic molecular crystal (such as Mn${}_{12}$-Ac), when a time dependent external magnetic field is applied parallel to the easy axis of the crystal. We show that the back action of the cavity field on the sample significantly increases the possibility of microwave emission. This radiation process can be supperradiance or a maser-like effect, depending on the strength of the dephasing. Our model provides further insight to the theoretical understanding of the bursts of electromagnetic radiation observed in recent experiments accompanying the resonant quantum tunneling of magnetization. The experimental findings up to now can all be explained as being a maser effect rather than superradiance. The results of our theory scale similarly to the experimental findings, i.e., with increasing sweep rate of the external magnetic field, the emission peaks are shifted towards higher field values.

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