Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 101: Theoretical advances in interacting topological phases (organized by TT)

HL 101.5: Topical Talk

Donnerstag, 3. April 2014, 17:15–17:45, HSZ 03

Fractional Chern Insulators in Strongly Correlated Multiorbital Systems — •Maria Daghofer, Stefanos Kourtis, Jörn W. F. Venderbos, and Jeroen van den Brink — IFW Dresden, Dresden, Germany

Interaction between itinerant carriers and localized spins on frustrated lattices can stabilize phases that are in many respects similar to a Landau level, with a non-coplanar spin background taking the role of the 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 (FQH) states, but do not require an external magnetic field. I will discuss a t2g-orbital system on a triangular lattice that supports a spin-chiral magnetic ordering pattern with precisely the required topologically non-trivial and flat bands[1]. Exact-diagonalization methods reveal signatures of a FQH-like ground state. Moreover, we also find states that go beyond the physics of Landau levels: They show a combination of conventional (charge) and topological order and are related to the frustration of the underlying triangular lattice [2].
J. W. F. Venderbos et al., PRL 108, 126405 (2012)
S. Kourtis and M. Daghofer, arXiv:1305.6948

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