Theory of correlated electrons
Quantum entanglement of spin, orbital and charge degrees of freedom of
correlated electrons in oxides is the main topic of our interest. As members of
the experimental department, we are strongly motivated by the exciting
discoveries made in the lab and try to understand them in terms of many-body
theories. Prediction of novel electronic phases in oxides and their
interfaces/heterostructures is the main goal of our joint work within Keimer's
department as well as with the members of Metzner's and Andersen's theory
Exploring spin-orbital models with dipolar fermions in zigzag optical lattices
G. Sun, G. Jackeli, L. Santos, T. Vekua.
Phys. Rev. B 86 (2012) 155159
Large spin-wave energy gap for the bilayer iridate Sr3Ir2O7: Evidence for enhanced dipolar interactions near the Mott metal-insulator transition
J. Kim, A. H. Said, D. Casa, M. H. Upton, T. Gog, M. Daghofer, G. Jackeli, J. van den Brink, G. Khaliullin, B. J. Kim.
Phys. Rev. Lett. 109 (2012), 157402
Magnetic excitation spectra of Sr2IrO4 probed by resonant inelastic x-ray scattering: Establishing links to cuprate superconductors
J. Kim, D. Casa, M. H. Upton, T. Gog, Y.-J. Kim, J. F. Mitchell, M. van Veenendaal, M. Daghofer, J. van den Brink, G. Khaliullin, B. J. Kim.
Phys. Rev. Lett. 108 (2012), 177003
Disorder induced transition between s+− and s++ states in two-band superconductors
D. V. Efremov, M. M. Korshunov, O. V. Dolgov, A. A. Golubov, P. J. Hirschfeld.
Phys. Rev. B 84 (2011), 180512(R)
Effects of spin vacancies on magnetic properties of the Kitaev-Heisenberg model
F. Trousselet, G. Khaliullin, and P. Horsch.
Phys. Rev. B 84 (2011), 054409
Spin-orbital resonating valence bond liquid on a triangular lattice: Evidence from finite-cluster diagonalization
J. Chaloupka and A. M. Oleś.
Phys. Rev. B 83 (2011), 094406
Phase diagram of the Kitaev-Heisenberg model on a honeycomb lattice. It describes the spin-orbit entangled ground states in iridium oxides and
contains a quantum spin liquid phase supporting the emergent topological excitations represented by Majorana fermions.
J. Chaloupka et al., Phys. Rev. Lett., 2010
See also: arXiv:1209.5100