Why Some Interfaces Cannot be Sharp

Details Why Some Interfaces Cannot be Sharp Why Some Interfaces Cannot be Sharp

2005-10-19

arxiv.org/abs/cond-mat/0510491v1

Nature Materials, V5, p 204-209 (2006)

Physics

Condensed Matter

Materials Science

12 pages of text, 6 figures

Scientific paper

10.1038/nmat1569

A central goal of modern materials physics and nanoscience is control of materials and their interfaces to atomic dimensions. For interfaces between polar and non-polar layers, this goal is thwarted by a polar catastrophe that forces an interfacial reconstruction. In traditional semiconductors this reconstruction is achieved by an atomic disordering and stoichiometry change at the interface, but in multivalent oxides a new option is available: if the electrons can move, the atoms don`t have to. Using atomic-scale electron energy loss spectroscopy we find that there is a fundamental asymmetry between ionically and electronically compensated interfaces, both in interfacial sharpness and carrier density. This suggests a general strategy to design sharp interfaces, remove interfacial screening charges, control the band offset, and hence dramatically improving the performance of oxide devices.

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