Research activity: - high temperature superconductivity (SC): author of the scenario based on CDW (or stripes) and quantum criticality in cuprates (PRL 1995, PRL 2000, review Physica C 2012,... ) - inhomogeneous electronic states and SC in oxide interfaces. Research interests: Critical phenomena in (disordered) el systems; strongly correlated el systems; high temperature superconductors; el-phonon interacting systems; low-dimensional el systems (SC, spin-orbit, and topologic effects)