Larmor frequency dressing by a nonharmonic transverse magnetic field
Larmor frequency dressing by a nonharmonic transverse magnetic field
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DOI：
10.1103/physreva.85.042510
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发表时间：
2011-12
影响因子：
2.9
通讯作者：
G. Bevilacqua;V. Biancalana;Y. Dancheva;L. Moi
中科院分区：
文献类型：
--
作者：
G. Bevilacqua;V. Biancalana;Y. Dancheva;L. Moi
我们提出了在静态和正交振荡磁场存在下的自旋进动的理论和实验研究，该磁场是非共振的，与拉莫尔进动没有谐波关系，并且具有任意强度。由于系统固有的非线性，以往只考虑简单正弦情况的模型不能适用。我们提出了一种替代方法，并开发了一个与光泵原子磁强计产生的实验数据密切一致的模型。我们证明了适当设计的非谐波场可以提取弱直流横向场的线性响应，尽管磁力计的标量性质通常会导致更弱的二阶响应。
We present a theoretical and experimental study of spin precession in the presence of both a static and an orthogonal oscillating magnetic field, which is nonresonant, not harmonically related to the Larmor precession, and of arbitrary strength. Due to the intrinsic nonlinearity of the system, previous models that account only for the simple sinusoidal case cannot be applied. We suggest an alternative approach and develop a model that closely agrees with experimental data produced by an optical-pumping atomic magnetometer. We demonstrate that an appropriately designed nonharmonic field makes it possible to extract a linear response to a weak dc transverse field, despite the scalar nature of the magnetometer, which normally causes a much weaker, second-order response.