2000 Fiscal Year Final Research Report Summary
Electron Energy Bands Studied by 2-Dimensional and Polarization Dependent Photoelectron Spectroscopy Using Synchrotron Radiation
| Project/Area Number |
10304024
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| Research Category |
Grant-in-Aid for Scientific Research (A).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
NAMBA Hidetoshi Ritsumeikan Univ., Fac.Science and Engineering, Professor, 理工学部, 教授 (40118766)
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| Co-Investigator(Kenkyū-buntansha) |
HATTORI Ken Nara Institute of Science and Technology, Graduate School of Materials Science, Department of Materials Science, Assocate Professor, 物質創成科学研究科, 助教授 (00222216)
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| Project Period (FY) |
1998 – 2000
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| Keywords | New Surface Materials / One Dimensional Materials / Two Dimensional Materials / Fermi Surface / Energy Band / Photoelectron Spectroscopy / Synchrotron Radiation |
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| Research Abstract |
Electronic states of 2- or 1-dimensional materials on surfaces and high-temperature superconductors can be best studied by 2-dimensional display type ultraviolet photoelectron spectroscopy using synchrotron radaition (SR). We developed a new beamline for this purpose at BL-7 of Ritsumeikan University SR Center. Linearly polarized SR of the photon energy from 30 to 150 eV is available by this beamline. By using a 2-dimensional display type spherical mirror electron energy analyzer for angle-resolved photoelectron spectroscopy, we can measure electronic energy bands of crystalline materials over a very wide range of the Brilluion zone within a very short time of measurements. We can also determine the atomic orbitals of the energy bands by analyzing the polarization dependence of 2-dimensional photoelectron emission patterns. So we constructed a new experimental apparatus for these purposes. The electronic states of single crystalline graphite and of the clean surfaces of Si(100) were st
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udied by this method.
Photoelectron emission patterns of graphite as a function of the binding energy of electrons were recorded and the energy bands over the wide range of the Brilluion zone were determined. The Fermi surface of graphite was determined from the emission pattern displayed at the binding energy of the Fermi level. The specific changes of the photoelectron emission patterns as a function of the photon energy were revealed. The structure factor of photoemission processes was estimated from the results. By analyzing the incident angle dependence of the emission patterns, the characters of the atomic orbitals of the valence bands are determined.
On the clean surfaces of Si(100), the photoelectron emission patterns from the dangling bonds of the surface dimer are found. The bulk electronic states near T-point of the Brilluin zone is also detected.
In conclusion, the experimental system for the exclusive use of 2-dimensional display type photoelectron spectroscopy by using SR was completed. This opens unique studies of low dimensional electron physics of new materials in future. Less
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