Evolution of inhomogeneously broadened spin-noise spectrum with ac drive

Article

关键词: SEMICLASSICAL DESCRIPTION;    SPECTROSCOPY;   

DOI  :  10.1103/PhysRevB.91.155301

来源: SCIE

【 摘 要 】

In the presence of random hyperfine fields, the noise spectrum, , of a spin ensemble represents a narrow peak centered at omega = 0 and a broad wing reflecting the distribution of the hyperfine fields. In the presence of an ac drive, the dynamics of a single spin acquires additional harmonics at frequencies determined by both the drive frequency and the local field. These harmonics are reflected as additional peaks in the noise spectrum. We study how the ensemble-averaged . evolves with the drive amplitude, omega(dr) (in the frequency units). Our main finding is that additional peaks in the spectrum, caused by the drive, remain sharp even when. omega(dr) is much smaller than the typical hyperfine field. The reason is that the drive affects only the spins for which the local Larmour frequency is close to the drive frequency. The shape of the low-frequency Rabi-peak in is universal with both the position and the width, being of the order of omega(dr). When the drive amplitude exceeds the width of the hyperfine field distribution, the noise spectrum transforms into a set of sharp peaks centered at harmonics of the drive frequency.

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