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https://scholarbank.nus.edu.sg/handle/10635/110956
DC Field | Value | |
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dc.title | STUDY OF NOVEL QUANTUM PHENOMENA OBSERVED AT OXIDES INTERFACES | |
dc.contributor.author | TEGUH CITRA ASMARA | |
dc.date.accessioned | 2014-11-26T18:00:25Z | |
dc.date.available | 2014-11-26T18:00:25Z | |
dc.date.issued | 2014-07-22 | |
dc.identifier.citation | TEGUH CITRA ASMARA (2014-07-22). STUDY OF NOVEL QUANTUM PHENOMENA OBSERVED AT OXIDES INTERFACES. ScholarBank@NUS Repository. | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/110956 | |
dc.description.abstract | In condensed matter physics the quasi two-dimensional electron gas at the interface of two different insulators, polar LaAlO₃ on non-polar SrTiO₃ (LaAlO₃/SrTiO₃) is a spectacular and surprising observation. This phenomenon is LaAlO₃ film thickness-dependent and may be explained by the polarization catastrophe model, in which a charge transfer of 0.5e⁻ from the LaAlO₃ film into the LaAlO₃/SrTiO₃ interface is expected. Here we show that in conducting samples (≥ 4 unit cells of LaAlO₃) there is indeed a ~0.5e⁻ transfer from LaAlO₃ into the LaAlO₃/SrTiO₃ interface by studying the optical conductivity in a broad energy range (0.5¿35 eV). Surprisingly, in insulating samples (≤ 3 unit cells of LaAlO₃) a redistribution of charges within the polar LaAlO₃ sub-layers (from AlO₂ to LaO) as large as ~0.5e⁻ is observed, with no charge transfer into the interface. Hence, our results reveal the different mechanisms for the polarization catastrophe compensation in insulating and conducting LaAlO₃/SrTiO₃ interfaces. | |
dc.language.iso | en | |
dc.subject | oxide, interface, conductivity, optics, ellipsometry, reflectivity | |
dc.type | Thesis | |
dc.contributor.department | PHYSICS | |
dc.contributor.supervisor | ANDRIVO RUSYDI | |
dc.contributor.supervisor | ARIANDO | |
dc.contributor.supervisor | VENKATESAN, THIRUMALAI VENKY | |
dc.description.degree | Ph.D | |
dc.description.degreeconferred | DOCTOR OF PHILOSOPHY | |
dc.identifier.isiut | NOT_IN_WOS | |
Appears in Collections: | Ph.D Theses (Open) |
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AsmaraTC.pdf | 8.65 MB | Adobe PDF | OPEN | None | View/Download |
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