Two Dimensional Spin-Polarized Electron Gas at the Oxide Interfaces

Details Two Dimensional Spin-Polarized Electron Gas at the Oxide Interfaces Two Dimensional Spin-Polarized Electron Gas at the Oxide Interfaces

2008-04-24

arxiv.org/abs/0804.4023v1

Phys. Rev. Lett. 101 (2008) 127201

Physics

Condensed Matter

Materials Science

5 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.101.127201

The formation of a novel spin-polarized 2D electron gas at the LaMnO$_3$ monolayer embedded in SrMnO$_3$ is predicted from the first-principles density-functional calculations. The La (d) electrons become confined in the direction normal to the interface in the potential well of the La layer, serving as a positively-charged layer of electron donors. These electrons mediate a ferromagnetic alignment of the Mn t$_{2g}$ spins near the interface via the Anderson-Hasegawa double exchange and become, in turn, spin-polarized due to the internal magnetic fields of the Mn moments.

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