论文标题
光子辅助磁声共振的理论作为四极动力学的新探针
Theory of Photon-Assisted Magnetoacoustic Resonance as a New Probe of Quadrupole Dynamics
论文作者
论文摘要
由量子介导的对照在量子自旋设备中的最新进展的动机，我们提出了使用电子顺磁共振（EPR）和表面声波（SAW）进行混合测量的可能性。考虑到硅位置空位建议的四极晶石（QS）耦合，我们提出了两级系统的最小模型，以研究与锯驱动的各种应变模式相连的磁声共振（MAR）。可以通过旋转磁场来改变纵向和横向QS耦合，这取决于应变模式的组合。使用浮雕理论，我们阐明了每个耦合效应对时间平均过渡概率的效果，尤其是专注于单次旋转过程。重要的结果是，纵向QS耦合带来了尖锐的光子辅助共振，并导致依赖性过渡概率突然变化。由于此声子过渡过程始终伴随着光子过渡，因此可以通过EPR测量检测到尖锐的共振峰的场角。混合EPR-MAR测量可用于确认存在与弹性菌株的四极自由度的存在，因此预计它将是对四极特性的精确评估的补充探测器。
Motivated by the recent progress of phonon-mediated control in quantum spin devices, we propose a possibility of hybrid measurement using electron paramagnetic resonance (EPR) and a surface acoustic wave (SAW). Considering quadrupole-strain (QS) couplings suggested for silicon vacancies, we present a minimum model of the two-level system to investigate a magnetoacoustic resonance (MAR) coupled to various strain modes driven by the SAW. The longitudinal and transverse QS couplings can be changed by rotating a magnetic field, which depends on a combination of the strain modes. Using the Floquet theory, we elucidate each coupling effect on the time-averaged transition probability, especially focus on a single-phonon transition process. The important result is that the longitudinal QS coupling brings about a sharp photon-assisted resonance and leads to an abrupt change in the field-angle dependent transition probability. Since this phonon transition process is always accompanied by the photon transition, the field angle for the sharp resonance peak can be detected by the EPR measurement. The hybrid EPR-MAR measurement is useful to confirm the existence of quadrupole degrees of freedom strongly coupled to elastic strains, and thus it is expected to be a complementary probe for the precise evaluation of quadrupole properties.
