| URN |
etd-0630113-130831 |
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| Author |
Chia-Hsiu Hsu |
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| Author's Email Address |
shgosh2001@yahoo.com.tw |
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| Statistics |
This thesis had been viewed 5578 times. Download 224 times. |
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| Department |
Physics |
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| Year |
2012 |
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| Semester |
2 |
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| Degree |
Ph.D. |
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| Type of Document |
|
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| Language |
English |
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| Title |
Atomic and electronic structures of layered structures formed on the Si(111) and SiC(0001) surfaces: a first-principles study |
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| Date of Defense |
2013-06-20 |
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| Page Count |
75 |
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| Keyword |
Si(111)
SiC(0001)
graphene
band structure
first-principles
surface reconstruction
|
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| Abstract |
Atomic and electronic structures of metal overlayers on the Si(111) surface were
studied by first-principles calculations. For the one-dimensional metal atomic wires
on Si(111), we first revisited and examined the models with a honeycomb chain
feature for the Au/Si(111)-(5×2) surface reconstruction systematically. Our newly
identified model reproduces certain key features in the angle-resolved photoemission
spectroscopy (ARPES) measurement and experimental scanning tunneling microscope
(STM) images. Next, similarly structural models for the Ag/Si(111)-c(12×2)
phase were also identified from a systematic search. The mechanisms of phase transitions from 3×1 to 6×1 and from 6×1 to c(12×2) have also been examined. The
simulated STM images of this c(12×2) model is in excellent agreement with the experimental STM images. On the other hand, for two dimensional metal overlayers
grown on Si(111), the band structures of Pb/Si(111)-√7×√3 surface reconstruction
were analyzed in detail, and are in good agreement with the identified bands in the
experimental study. Finally, we discuss the 2×2 graphene on SiC(0001)-√3×√3.
It becomes a buffer layer when graphene growth on SiC(0001) suface, and the Dirac
point of graphene will disappear. However, by intercalating Bi or Sb layer to become
a buffer layer make the Dirac cone of graphene will preserved. On the other hand,
for the Bi and Sb buffer layer the π and π* bands of the graphene exhibit spin–orbit
(SO) splitting will be shown. |
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| Advisory Committee |
Chien-Cheng Kuo - chair
Wen-Jay Lee - co-chair
Wei-Feng Tsai - co-chair
Ya-Ping Chiu - co-chair
Feng-Chuan Chuang - advisor
|
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| Files |
indicate access worldwide |
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| Date of Submission |
2013-07-30 |
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