Journal
PHYSICAL REVIEW B
Volume 83, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.125406
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [21560695]
- Grants-in-Aid for Scientific Research [21560695] Funding Source: KAKEN
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Synchrotron-radiation angle-resolved photoelectron spectroscopy has been utilized to study the interaction of atomic H with the nonpolar ZnO(10 (1) over bar0) surface and polar ZnO(000 (1) over bar) and (0001) surfaces. H adsorption leads to the semiconductor-to-metal transition on the ZnO(10 (1) over bar0) and (000 (1) over bar) surfaces. Metallization is a consequence of the formation of a single metallic band within the potential well between the surface/vacuum interface barrier and the edge of the conduction band, which is bent downwardly at the surface. The electrons confined in the potential well exhibit a free-electron-like behavior along the surface parallel, realizing a two-dimensional electron gas system. For the H/ZnO(0001) system, on the other hand, no feature associated with the metallic band is observed. Higher reactivity of the ZnO(0001) surface toward H than the other two ZnO surfaces is responsible for the different behavior for the modification of the surface electronic structure by H adsorption.
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