Ce $^{3+}$离子在YAG晶体中的电子自旋动力学研究
Electron spin dynamics of Ce$^{3+}$ ions in YAG crystals studied by pulse-EPR and pump-probe Faraday rotation
摘要：
利用脉冲电子顺磁共振和时间分辨抽运探测法拉第旋转研究了重掺铈钇铝石榴石晶体中Ce $^{3+}$离子的自旋弛豫动力学。这两种技术都解决了4 $f$基态，而泵浦-探测法拉第旋转也提供了对激发的5 $d$态的访问。在低温下测量了Ce $^{3+}$基态的毫秒级自旋晶格弛豫时间$T_1$、微秒级自旋相干时间$T_2$和$\sim 10$ ns级非均匀自旋退相时间$T_2^*$. Ce $^{3+}$离子的自旋-晶格弛豫是由于涉及125 cm $^{-1}$处的光学声子模的修改的拉曼过程。在较高温度下的弛豫通过在约$\hbar ω\approx 228$ cm $^{-1}$处的$^{2}$ F $_{5/2}$项的第一激发能级。观察到Ce $^{3+}$与$^{27}$ Al核的超精细相互作用所提供的效应。
英文摘要：
The spin relaxation dynamics of Ce$^{3+}$ ions in heavily cerium-doped YAG crystals is studied using pulse-electron paramagnetic resonance and time-resolved pump-probe Faraday rotation. Both techniques address the 4$f$ ground state, while pump-probe Faraday rotation provides also access to the excited 5$d$ state. We measure a millisecond spin-lattice relaxation time $T_1$, a microsecond spin coherence time $T_2$ and a $\sim 10$ ns inhomogeneous spin dephasing time $T_2^*$ for the Ce$^{3+}$ ground state at low temperatures. The spin-lattice relaxation of Ce$^{3+}$ ions is due to modified Raman processes involving the optical phonon mode at 125 cm$^{-1}$. The relaxation at higher temperature goes through a first excited level of the $^{2}$F$_{5/2}$ term at about $\hbar ω\approx 228$ cm$^{-1}$. Effects provided by the hyperfine interaction of the Ce$^{3+}$ with the $^{27}$Al nuclei are observed.
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