Mechanical rotation via optical pumping of paramagnetic impurities
Mechanical rotation via optical pumping of paramagnetic impurities
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DOI：
10.1103/physrevb.100.235410
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发表时间：
2019-03
影响因子：
3.7
通讯作者：
P. Zangara;A. Wood;M. Doherty;C. Meriles
中科院分区：
文献类型：
--
作者：
P. Zangara;A. Wood;M. Doherty;C. Meriles
表现出耦合的光学、自旋和机械自由度的混合量子系统可以作为传感平台，或者作为总线来调解具有不同能量尺度的量子位之间的相互作用。这些系统也为测试量子力学的基本思想创造了机会，包括对宏观物体中量子机制的直接观察。在这里，我们利用角动量守恒来研究一对具有不同自旋数的顺磁中心在适当调谐的外部磁场的存在下的动力学。我们研究了光激发，自旋演化和机械运动之间的相互作用，并从理论上表明，在连续的光照射的存在下，interspin交叉弛豫必须诱导刚性旋转的主机晶体。系统动力学对自旋极化声子的散射是鲁棒的，我们建立的结果表明这种形式的角动量转移应该使用最先进的扭转振荡器或捕获的纳米颗粒来观察。
Hybrid quantum systems exhibiting coupled optical, spin, and mechanical degrees of freedom can serve as a platform for sensing, or as a bus to mediate interactions between qubits with disparate energy scales. These systems are also creating opportunities to test foundational ideas in quantum mechanics, including direct observations of the quantum regime in macroscopic objects. Here, we make use of angular momentum conservation to study the dynamics of a pair of paramagnetic centers featuring different spin numbers in the presence of a properly tuned external magnetic field. We examine the interplay between optical excitation, spin evolution, and mechanical motion, and theoretically show that in the presence of continuous optical illumination, interspin cross relaxation must induce rigid rotation of the host crystal. The system dynamics is robust to scattering of spin-polarized phonons, a result we build on to show this form of angular momentum transfer should be observable using state-of-the-art torsional oscillators or trapped nanoparticles.