Doping a correlated band insulator: A new route to half metallic behaviour

Abstract

We demonstrate in a simple model the surprising result that turning on an on-site Coulomb interaction U in a doped band insulator leads to the formation of a half-metallic state. In the undoped system, we show that increasing U leads to a first order transition between a paramagnetic, band insulator and an antiferomagnetic Mott insulator at a finite value U_{AF}. Upon doping, the system exhibits half metallic ferrimagnetism over a wide range of doping and interaction strengths on either side of U_{AF}. Our results, based on dynamical mean field theory, suggest a novel route to half-metallic behavior and provide motivation for experiments on new materials for spintronics.

5 pages, 7 figures

References in corpus (8)

• Half-metallic ferromagnets: From band structure to many-body effects
• Quantum Monte Carlo Study of an Interaction-Driven Band Insulator to Metal Transition
• Metallic phase in the two-dimensional ionic Hubbard model
• Electronic phase transitions in the half-filled ionic Hubbard model
• Insulating behavior with spin and charge order in the ionic Hubbard model
• Promising ferrimagnetic double perovskite oxides towards high spin polarization at high temperature
• Half Metallic Bilayer Graphene
• Half-metallic magnetization plateaux

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