Intrinsic instability of electronic interfaces with strong Rashba coupling

Details Intrinsic instability of electronic interfaces with strong Rashba coupling Intrinsic instability of electronic interfaces with strong Rashba coupling

2012-04-04

arxiv.org/abs/1204.0962v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

We consider a model for the two-dimensional electron gas formed at the interface of oxide heterostructures, which includes a Rashba spin-orbit coupling proportional to the electric field perpendicular to the interface. Based on the standard mechanism of polarity catastrophe, we assume that the electric field is proportional to the electron density. Under these simple and general assumptions, we show that a phase separation instability occurs for realistic values of the spin-orbit coupling and of the band parameters. This could provide an intrinsic mechanism for the recently observed inhomogeneous phases at the LaAlO_3/SrTiO_3 or LaTiO_3/SrTiO_3 interfaces.

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