Hybrid Molecular Beam Epitaxy of Complex Oxide Heterostructures with Ultrahigh Electron Density
2017-01
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Hybrid Molecular Beam Epitaxy of Complex Oxide Heterostructures with Ultrahigh Electron Density
Authors
Published Date
2017-01
Publisher
Type
Thesis or Dissertation
Abstract
Two-dimensional electron gases (2DEG) at complex oxide interfaces have attracted lots of attention for fundamental physics studies and potential applications in novel oxidebased electronics. While most researches focuses on LaAlO3/SrTiO3 heterostructures, many interesting phenomena were also discovered at titanates heterostructures, such as LaTiO3/SrTIO3 and GdTiO3/SrTiO3. In this study, we chose another material system, NdTiO3/SrTiO3, to investigate the 2DEG at the interfaces. NdTiO3 and SrTiO3 thin films and heterostructures were grown using the hybrid molecular beam epitaxy approach. 3E14 cm-2 (0.5 e-/u.c.) was realized at NdTiO3/SrTiO3 interfaces, and precise control of carrier density and metal-to-insulator transition were achieved by intentionally introducing Nd vacancies. Moreover, ultrahigh carrier density (~1E15 cm-2) was discovered by band engineering NdTiO3/SrTiO3 heterostructures. The charge transfer model was proposed to explain such high carrier density. Both experimental results and computational modeling suggest the broken-gap type band offset drives charge transfer from NdTiO3 to SrTiO3. Finally, we will also discuss environmental oxygen effects on electronic transport properties of NdTiO3/SrTiO3.
Description
University of Minnesota Ph.D. dissertation. January 2017. Major: Material Science and Engineering. Advisor: Bharat Jalan. 1 computer file (PDF); xxvii, 214 pages.
Related to
Replaces
License
Collections
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Xu, Peng. (2017). Hybrid Molecular Beam Epitaxy of Complex Oxide Heterostructures with Ultrahigh Electron Density. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/185587.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.