Shasta Room, Bldg 40, Room 361

2575 Sand Hill Road
Menlo Park

United States

Maria Daghofer (IFW Dresden, Germany)

 Correlations and Topology in multi-orbital models

Electronic correlations have long been known to fundamentally affect a material’s property. I will discuss situations, where they can induce topologically nontrivial electronic states. Interaction between itinerant carriers and localized spins on frustrated lattices can stabilize phases that are in many respects similar to a Landau level, as a non-coplanar spin background gives the electrons a complex phase analogous to that induced by a magnetic field. If the bands are nearly flat, longer-range Coulomb repulsion can then induce states that are like lattice-analogs of fractional Quantum-Hall states, but do not require an external magnetic field.

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