Excited-state lifetime of the NV− infrared transition in diamond
Excited-state lifetime of the
NV−
infrared transition in diamond
复制标题
金刚石中 NV− 红外跃迁的激发态寿命
DOI：
10.1103/physrevb.98.094309
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发表时间：
2018
影响因子：
3.7
通讯作者：
Zhi
中科院分区：
文献类型：
--
作者：
R. Ulbricht;Zhi
金刚石中带负电荷的氮空位（）缺陷作为一个流行的平台，用于操纵和利用在室温下结合光学读出的长寿命相干自旋动力学。所需的自旋三电子基态的自旋极化发生通过一个周期的重复光激发事件的电子激发态，伴随着一系列的电子跃迁到一个和一个电子状态，并返回状态。这些转变的时间尺度在很大程度上是已知的，但对于主要通过非辐射复合发生的红外转变的弛豫时间，迄今为止只能确定1 ns的上限。本文利用超快瞬态吸收光谱研究了光激发态到态的非辐射弛豫动力学过程，发现在78K时弛豫时间为100ps。
The negatively charged nitrogen vacancy () defect in diamond serves as a popular platform for manipulating and exploiting long-lived coherent spin dynamics at room temperature combined with optical readout. The required spin polarization of the spin tripletelectronic ground state occurs through a cycle of repetitious optical photoexcitation events to theelectronic excited state that is accompanied by a series of electronic transitions to aand aelectronic state, and back to thestate. The timescales of these transitions are largely known, yet for the relaxation time of theinfrared transition, which predominantly occurs via nonradiative recombination, only an upper limit of 1 ns could be determined so far. Here, we employ ultrafast transient absorption spectroscopy to probe the dynamics of the nonradiative relaxation from theto thestate after photoexcitation of thestate and find a relaxation time of 100 ps at a temperature of 78 K.