Prof. Dr. rer. nat. habil. Holger Fehske
Institute of Physics, Felix-Hausdorff-Str. 6, D-17487 Greifswald

Room B307


Curriculum vitae

Research Interests

My main research interests are ground-state and spectral (dynamical) properties of complex quantum many-particle systems - such as solids, quantum liquids, quantum spin chains or plasmas - with an emphasis on
  • interplay of spin, charge, lattice and orbital degrees of freedom in materials with strong electronic correlations (heavy fermions, high-temperature superconducting cuprates, colossal magnetoresistive manganites, charge-ordered nickelates,...)
  • quasi-1D electron/spin-phonon-systems (symmetry-broken ground states, Peierls & spin-peierls instabilties, intrinsic localized vibrational modes, Luttinger liquid behaviour, spin-charge-separation, metal-insulator & insulator-insulator transitions,...)
  • disorder effects (Anderson localization, percolation, frustration, spin glasses,...)
  • magnetic short-range order in itinerant electron systems
  • polaron, bipolaron & exciton formation (self-trapping transition, optical response, polaronic superlattices, excitonic insulators, Bose-Einstein condensation,...)
  • complex electron-hole plasmas
In all projects, we want to gain insight from a microscopic point of view. We employ modern analytical and numerical techniques of quantum theory of many partical systems. Among others, we use
  • functional integral (slave-field) methods,
  • Green's-function projection approaches,
  • unitary transformation schemes,
  • Lanczos & Jacobi-Davisdon diagonalizations,
  • kernel-polynomial expansion & maximum entropy methods,
  • density matrix renormalisation group.