| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Outline of Final Research Achievements |
Phosphorous-silicon heterodimer incorporated in the Si(100) surface was investigated by means of scanning tunneling microscopy (STM) and density functional theory (DFT). A comparison between experimental and simulated STM images obtained with various sample biases determined the structure of the P-Si heterodimer: The P atom is buckled down to the surface while the Si atom is buckled up to vacuum. This result rejects the previously suggested structure of the P-Si heterodimer. Scanning tunneling spectroscopy and DFT calculation revealed an intense density of state around the Fermi level and this state causes the bright feature of the P-Si heterodimer in the STM images. Furthermore, we found a candidate associated with phosphorous in an STM observation, which is predicted by DFT to bear a spin polarized charge density near the Fermi level. This will be experimentally investigated in the future.
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