Dimensionality Control of d-orbital Occupation in Oxide Superlattices
- Title
- Dimensionality Control of d-orbital Occupation in Oxide Superlattices
- Author
- 문순재
- Keywords
- TRANSITION; PRINCIPLES; OCCUPANCY; INTERFACE; LACOO3
- Issue Date
- 2014-08
- Publisher
- NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
- Citation
- SCIENTIFIC REPORTS, 2014, 4, p1-14
- Abstract
- Manipulating the orbital state in a strongly correlated electron system is of fundamental and technological importance for exploring and developing novel electronic phases. Here, we report an unambiguous demonstration of orbital occupancy control between t(2g) and e(g) multiplets in quasi-two-dimensional transition metal oxide superlattices (SLs) composed of a Mott insulator LaCoO3 and a band insulator LaAlO3. As the LaCoO3 sublayer thickness approaches its fundamental limit (i.e. one unit-cell-thick), the electronic state of the SLs changed from a Mott insulator, in which both t(2g) and e(g) orbitals are partially filled, to a band insulator by completely filling (emptying) the t(2g) (e(g)) orbitals. We found the reduction of dimensionality has a profound effect on the electronic structure evolution, which is, whereas, insensitive to the epitaxial strain. The remarkable orbital controllability shown here offers a promising pathway for novel applications such as catalysis and photovoltaics, where the energy of d level is an essential parameter.
- URI
- http://www.nature.com/articles/srep06124http://hdl.handle.net/20.500.11754/46998
- ISSN
- 0068-1261
- DOI
- 10.1038/srep06124
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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