Electronic properties of correlated heterostructures
Multi-orbital physics in transition-metal oxides
High-energy excitations in strongly correlates Fermi systems
Topological defects and fractionalization in frustrated systems and spin liquids
Gauge-theoretical, projective and auxiliary-particle approaches to strongly correlated models
Theses
Doctoral thesis: Physical properties of artificially structured strongly correlated electron systems, ETH Zürich (2009)
A free electronic version can be found at the ETH e-collection.
My doctoral thesis has also been published by the Südwestdeutscher Verlag für Hochschulschriften (March 30, 2010). You can buy it for example on amazon.com (for an absurd price, though).
Diploma thesis: Slave-boson mean-field theory of the Mott transition in the two-band Hubbard, ETH Zürich (2005)