Interface controlled electronic charge inhomogeneities in correlated heterostructures

Abstract

For heterostructures of ultrathin, strongly correlated copper-oxide films and dielectric perovskite layers, we predict inhomogeneous electronic interface states. Our study is based on an extended Hubbard model for the cuprate film. The interface is implemented by a coupling to the electron and phonon degrees of freedom of the dielectric oxide layer. We find that electronic ordering in the film is associated with a strongly inhomogeneous polaron effect. We propose to consider the interfacial tuning as a powerful mechanism to control the charge ordering in correlated electronic systems.

5 pages, 4 figures, to appear in Physical Review Letters

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• Magnetically ordered state at correlated oxide interfaces: the role of random oxygen defects
• Slave-boson based configuration-interaction approach for the Hubbard model
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• Electronic charge and orbital reconstruction at cuprate-titanate interfaces