The reference-probe model for a robust and optimal radical-pair-based magnetic compass sensor.
The reference-probe model for a robust and optimal radical-pair-based magnetic compass sensor.
复制标题
用于稳健且最佳的基于根对的磁罗盘传感器的参考探针模型。
DOI：
10.1063/1.5128128
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
T. Ritz
中科院分区：
文献类型：
--
作者：
M. Procopio;T. Ritz
基对反应被认为对弱磁场的方向很敏感，从而为动物的磁罗盘提供了一种机制。发现使基对对弱磁场方向特别敏感的一般原理，对于设计生物启发的指南针传感器和推进我们对方向效应背后的自旋物理学的理解至关重要。参考探针模型是一种概念模型，用于识别径向对参数以获得最佳定向效果。具有探针性质的自由基对已经被广泛地证明可以提高弱磁场的方向灵敏度，但对参考自由基的作用的研究还很缺乏。在这里，我们评估自由基是否具有参考特性，然后研究其与最佳定向效应的相关性。我们用解析和数值计算的方法研究了一个具有轴向各向异性超精细相互作用的简单根对模型。解析计算得出了自由基对反应产率的一般表达式，这反过来又为定向效应提供了有用的见解。我们进一步研究了参考特征与抗地强磁场变化的鲁棒性的相关性，发现参考特征也捕获了鲁棒性特征。将本研究扩展到具有更多超精细相互作用的自由基对，我们讨论了在这些更复杂的自由基对中，参考特征与最优和稳健的方向效应之间的相互作用。
Radical-pair reactions have been suggested to be sensitive to the direction of weak magnetic fields, thereby providing a mechanism for the magnetic compass in animals. Discovering the general principles that make radical pairs particularly sensitive to the direction of weak magnetic fields will be essential for designing bioinspired compass sensors and for advancing our understanding of the spin physics behind directional effects. The reference-probe model is a conceptual model introduced as a guide to identify radical-pair parameters for optimal directional effects. Radical pairs with probe character have been extensively shown to enhance directional sensitivity to weak magnetic fields, but investigations on the role of the reference radical are lacking. Here, we evaluate whether a radical has reference character and then study its relevance for optimal directional effects. We investigate a simple radical-pair model with one axially anisotropic hyperfine interaction using both analytical and numerical calculations. Analytical calculations result in a general expression of the radical-pair reaction yield, which in turn provides useful insights into directional effects. We further investigate the relevance of the reference character to robustness against variations of earth-strength magnetic fields and find that the reference character captures robust features as well. Extending this study to radical pairs with more hyperfine interactions, we discuss the interplay between reference character and optimal and robust directional effects in such more complex radical pairs.
影响因子：
3.4
作者：
Ritz, T;Adem, S;Schulten, K
通讯作者：
Schulten, K