Quantum-Impurity Relaxometry of Magnetization Dynamics
Quantum-Impurity Relaxometry of Magnetization Dynamics
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DOI：
10.1103/physrevlett.121.187204
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发表时间：
2018-11-02
影响因子：
8.6
通讯作者：
Tserkovnyak, Y.
中科院分区：
文献类型：
--
作者：
Flebus, B.;Tserkovnyak, Y.
量子杂质的原型，如钻石中的NV和SIV色心，由于其微创和高分辨率的磁场和热敏特性而引起了人们的极大关注。在这里，我们研究量子杂质弛豫计量学作为探测磁绝缘体中集体激发的一种方法。我们发展了一个一般的框架，通过磁系统发出的噪声，将可测量的量子杂质弛豫率与磁系统的内禀动力学性质联系起来。我们特别指出，量子杂质弛豫测量对动态相变很敏感，例如磁振子凝聚，并且可以用来检测铁磁和反铁磁系统中相关相干自旋动力学的特征。最后，我们讨论了非侵入性探测磁绝缘体中的自旋输运机制和测量相关输运系数的前景。
Prototypes of quantum impurities, such as NV and SiV color centers in diamond, have garnered much attention due to their minimally invasive and high-resolution magnetic field and thermal sensing. Here, we investigate quantum-impurity relaxometry as a method for probing collective excitations in magnetic insulators. We develop a general framework to relate the measurable quantum-impurity relaxation rates to the intrinsic dynamic properties of a magnetic system via the noise emitted by the latter. We suggest, in particular, that the quantum-impurity relaxometry is sensitive to dynamic phase transitions, such as magnon condensation, and can be deployed to detect signatures of the associated coherent spin dynamics, both in ferromagnetic and antiferromagnetic systems. Finally, we discuss prospects to nonintrusively probe spin-transport regimes and measure the associated transport coefficients in magnetic insulators.