Impurity absorption spectroscopy in 28Si:: The importance of inhomogeneous isotope broadening -: art. no. 186402

被引:63
作者
Karaiskaj, D [1 ]
Stotz, JAH
Meyer, T
Thewalt, MLW
Cardona, M
机构
[1] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada
[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
关键词
D O I
10.1103/PhysRevLett.90.186402
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
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页数:4
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