矽(111)表面上矽奇異原子團的掃描穿隧能譜與分析

在矽(111)表面上，存在著一種矽奇異原子團，此種原子團具有均勻的大小與良好的熱穩定性，在矽(111)表面上的質量傳輸、形貌變化、與磊晶成長等佔有極大的重要性。利用掃描式穿隧顯微鏡，我們測量矽奇異原子團的掃描穿隧能譜，發現其電壓電流關係與7×7表面呈現極大的不同，並且我們分析矽奇異原子團的電子結構，發現在費米能級附近存在著約1eV的energy separation。而藉由比較矽奇異原子團與7×7表面的能譜，我們也可以解釋一些矽奇異原子團影像對比上的差異

關鍵字

掃描穿隧顯微鏡；掃描穿隧能譜；矽(111) ；奇異原子團；電子結構；侷域狀態密度

並列摘要

On Si (111) surface, there exists a special type of Si magic cluster which has a uniform size and high thermal stability. This kind of clusters has been found to play an important role in mass transport, electromigration, step fluctuations, epitaxial growth and phase transformation. We use scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) to measure the local density of state of Si magic clusters and find that their I-V curves are very different from that of 7×7 surface. In addition, we analyze the spectra of Si magic clusters and find that there exists an energy separation of about 1eV near the Fermi level. We also compare the spectra of Si magic clusters with that of 7×7, so we can interpret the image contrast between Si magic clusters and the 7×7 reconstruction at different tunneling polarities.

並列關鍵字

scanning tunneling microsopy ； scanning tunneling spectroscopy ； Si(111) ； magic cluster ； electronic structure ； local density of state

參考文獻

1. Dawn A.Bonnel “Scanning probe microscopy and spectroscopy : theory, techniques, and applications”(2ndED), Wiley-VCH , New York (2001)

2. I.-S Hwang, M.-S Ho, and T.T. Tsong, Phys. Rev. Lett. 83, 120 (1999)

3. I.-S Hwang, and T. T. Tsong, Phys. Rev. Lett. 84, 5792 (2000)

4. I.-S. Hwang, M.-S. Ho, and T.T. Tsong, Journal of Physics and Chemistry of Solids 62, 1655-1671 (2001)

5. R.Eisberg , and R.Resnik " Quantum Physics of Atoms , Molecules, Solids , Nuclei, and Particles”(2nd Ed), Wiley , New York (1997)

國際替代計量

矽(111)表面上矽奇異原子團的掃描穿隧能譜與分析

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