Impurity absorption spectroscopy in 28Si:: The importance of inhomogeneous isotope broadening -: art. no. 186402
Impurity absorption spectroscopy in 28Si:: The importance of inhomogeneous isotope broadening -: art. no. 186402
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DOI：
10.1103/physrevlett.90.186402
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发表时间：
2003-05-09
影响因子：
8.6
通讯作者：
Cardona, M
中科院分区：
文献类型：
--
作者：
Karaiskaj, D;Stotz, JAH;Cardona, M
本文报道了同位素纯Si-28晶体中中性施主磷和锂以及中性受主硼的高分辨率红外吸收光谱。令人惊讶的是，许多过渡比以前报道的天然硅尖锐得多。特别是，Si-28中磷的2 p（0）线的半峰全宽仅为4.2 μ eV，比先前报道的天然Si的最窄2 p（0）线小约5倍，使其成为迄今观察到的最窄的浅杂质跃迁。广泛持有的假设，杂质过渡以前报道的高品质样品的天然硅揭示了真实的，均匀的线宽，因此被证明是不正确的。Si-28中更尖锐的跃迁也揭示了硼和锂光谱中的新子结构。
We report high-resolution infrared absorption spectra of the neutral donors phosphorus and lithium, and the neutral acceptor boron, in isotopically pure Si-28 crystals. Surprisingly, many of the transitions are much sharper than previously reported in natural Si. In particular, the 2p(0) line of phosphorus in Si-28 has a full width at half maximum of only 4.2 mueV, about 5 times less than the narrowest 2p(0) line previously reported for natural Si, making it the narrowest shallow impurity transition yet observed. The widely held assumptions that the impurity transitions previously reported in high quality samples of natural Si revealed the true, homogeneous linewidths, are thus shown to be incorrect. The sharper transitions in Si-28 also reveal new substructures in the boron and lithium spectra.