Optical pumping NMR in the compensated semiconductor InP:Fe
Optical pumping NMR in the compensated semiconductor InP:Fe
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DOI：
10.1103/physrevb.69.075215
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发表时间：
2003-12
影响因子：
3.7
通讯作者：
A. Goto;K. Hashi;T. Shimizu;R. Miyabe;Xiaogang Wen;S. Ohki;S. Machida;T. Iijima;G. Kido
中科院分区：
文献类型：
--
作者：
A. Goto;K. Hashi;T. Shimizu;R. Miyabe;Xiaogang Wen;S. Ohki;S. Machida;T. Iijima;G. Kido
根据光子能量 E p 、螺旋度 σ ′ 和红外光曝光时间 τ L 的依赖性，研究了补偿半导体 InP:Fe 中的光泵浦核磁共振效应。 3 1 P 和 1 5 In 信号增强显示出较大的 σ ′ 不对称性和作为 E p 函数的反常振荡。我们发现 (i) 作为 E p 函数的振荡周期对于 3 1 P 和 1 1 5 In 是相似的，并且几乎与场无关，尽管在更高场中的增强显着降低。 (ii) 曝光下 3 1 P 偏振形成的特征时间显示出强烈的 E p 依赖性，但几乎与 σ ' 无关。 (iii) 3 1 P 和 1 1 5 In 的形成时间相同（10 3 s），尽管它们之间的自旋晶格弛豫时间 T 1 相差三个以上数量级。结果根据以下方面进行了讨论：(1) 由于补偿半导体中的供体-受体对而产生的离散能谱，以及 (2) 3 1 P 和偶极有序铟核之间的相互作用（光诱导）。
The optical pumping nuclear-magnetic-resonance effect in the compensated semiconductor InP:Fe has been investigated in terms of the dependences of photon energy E p , helicity σ ′ , and exposure time τ L of infrared lights.The 3 1 P and 1 5 In signal enhancements show large σ ′ asymmetries and anomalous oscillations as a function of E p . We find that (i) the oscillation period as a function of E p is similar for 3 1 P and 1 1 5 In and almost field independent in spite of significant reduction of the enhancement in higher fields. (ii) A characteristic time for buildup of the 3 1 P polarization under the light exposure shows strong E p dependence, but is almost independent of σ ′ . (iii) The buildup times for 3 1 P and 1 1 5 In are of the same order (10 3 s), although the spin-lattice relaxation times T 1 are different by more than three orders of magnitude between them. The results are discussed in terms of (1) discrete energy spectra due to donor-acceptor pairs in compensated semiconductors and (2) interplay between 3 1 P and dipolar ordered indium nuclei, which are optically induced.