Dobrovitski V V, Feiguin A E, Hanson R, Awschalom D D
Ames Laboratory U.S. DOE, Iowa State University, Ames, Iowa 50011, USA.
Phys Rev Lett. 2009 Jun 12;102(23):237601. doi: 10.1103/PhysRevLett.102.237601. Epub 2009 Jun 9.
We study the Rabi oscillations decay of a spin decohered by a spin bath whose internal dynamics is caused by dipolar coupling between the bath spins. The form and rate of decay as a function of the intrabath coupling is obtained analytically, and confirmed numerically. The complex form of decay smoothly varies from power law to exponential, and the rate changes nonmonotonically with the intrabath coupling, decreasing for both slow and fast baths. The form and rate of Rabi oscillations decay can be used to experimentally determine the intrabath coupling strength for a broad class of solid-state systems.
我们研究了由自旋浴导致自旋退相干的拉比振荡衰减，该自旋浴的内部动力学由浴自旋之间的偶极耦合引起。通过解析得到了作为浴内耦合函数的衰减形式和速率，并通过数值计算进行了验证。衰减的复杂形式从幂律平滑地变化到指数形式，并且速率随浴内耦合非单调变化，对于慢浴和快浴均减小。拉比振荡衰减的形式和速率可用于通过实验确定一大类固态系统的浴内耦合强度。
