Physics – Condensed Matter – Materials Science
Scientific paper
2011-06-29
Physical Review Letters 107, 166601 (2011)
Physics
Condensed Matter
Materials Science
5 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.107.166601
First-principles density functional calculations demonstrate that a spin-polarized two-dimensional conducting state can be realized at the interface between two non-magnetic band insulators. The (001) surface of the diamagnetic insulator FeS2 (pyrite) supports a localized surface state deriving from Fe d-orbitals near the conduction band minimum. The deposition of a few unit cells of the polar perovskite oxide LaAlO3 leads to electron transfer into these surface bands, thereby creating a conducting interface. The occupation of these narrow bands leads to an exchange splitting between the spin sub-bands, yielding a highly spin-polarized conducting state distinct from the rest of the non-magnetic, insulating bulk. Such an interface presents intriguing possibilities for spintronics applications.
Burton James D.
Tsymbal Evgeny Y.
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