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High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems by Werner, Philipp; Millis, Andrew J. is a scholarly article available to read on EtoBox.

What is High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems about?

We study the interplay of crystal field splitting and Hund coupling in a two-orbital model which captures the essential physics of systems with two electrons or holes in the e_g shell. We use single site dynamical mean field theory with a recently developed impurity solver which is able to access strong couplings and low temperatures. The fillings of the orbitals and the location of phase boundaries are computed as a function of Coulomb repulsion, exchange coupling and crystal field splitting. We find that the Hund coupling can drive the system into a novel Mott insulating phase with vanishing orbital susceptibility. Away from half-filling, the crystal field splitting can induce an orbital selective Mott state.

Author

Werner, Philipp; Millis, Andrew J.

Published

2007

Language

EN