Holger Fehske

Prof. Dr. rer. nat. habil. Holger Fehske

Group leader

Institute of Physics
Felix-Hausdorff-Str. 6
D-17489 Greifswald

Room B307

Phone +49 (0)3834 420-4760
Fax +49 (0)3834 420-4701
fehskephysik.uni-greifswaldde

Research interests

Research interests

I’m a theoretical physicist, with research interests mostly in quantum matter exhibiting  strong correlations and/or a nontrivial geometry/topology.  Thereby the focus is on (partly exotic) ground-state, spectral and dynamical properties of many-particle quantum systems, such as solids,  optical lattices, photonic crystals, spin chains,  quantum liquids and condensates, nanostructures, quantum dots, clusters, and bounded plasmas,  with potential applications in the rapidly developing fields of nano electronics, spintronics, plasmonics and photonics.

In particular, in our group we investigate

  • the interplay of spin, charge, lattice and orbital degrees of freedom in strongly correlated materials materials (heavy fermions, high-temperature superconducting cuprates, colossal magnetoresistive manganites, charge-ordered nickelates,...)
  • order, quantum phase transitions and criticality in  low-dimensional electron/spin-phonon coupled systems (Peierls & spin-Peierls instabilties, phase separation, intrinsic localized vibrational modes, Luttinger liquid behaviour, spin-charge-separation, metal-insulator & insulator-insulator transitions,...)
  • transport properties in coupled fermion-boson systems
  • symmetry-protected states in topological materials
  • electronic and optical properties of graphene-based nanostructures
  • disorder effects (Anderson localization, percolation, frustration, ,…)
  • magnetism, magnetic short-range order, and spin glas behaviour
  • polaron, bipolaron & exciton formation (self-trapping transition, optical response, polaronic superlattices, excitonic insulators, Bose-Einstein condensation,...)
  • cavity quantum electrodynamics (strong light-matter interaction, development of non-classical light and entanglement)
  • optomechanics (route to chaos)
  • equlibration and thermalisation
  • the plasma surface interface. 

In all projects, we try to gain insight from a (rather) microscopic point of view. To this end, we use, develop and exploit analytical and numerical techniques of modern quantum statistical physics, such as

  • functional integral (slave-field) methods,
  • Green's-function projection approaches,
  • unitary transformation schemes,
  • exact Lanczos & Jacobi-Davidson diagonalizations,
  • Chebyshev/kernel-polynomial expansion & maximum entropy methods,
  • density matrix renormalisation group techniques,
  • quantum state diffusion and Markov approaches.

Various present-day supercomputers are used  in the numerical evaluation, with modern programming concepts making allowance for scalability, numerical reliability, fault tolerance, holistic performance, and power engineering.

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Curriculum vitae

Education

1962-1972 Primary and secondary school in Gera
1972-1974 Grammar school in Gera
1974 Abitur (university entrance examination)

Training and Professional Positions

1976-1981 Study of physics at the University of Leipzig
1981 Diploma thesis in physics
1981-1984 Research scholarship of the University of Leipzig
1984 Doctor of Physics (PhD thesis), University of Leipzig
1996 Habilitation, University Bayreuth
1997 Venia legendi for Theoretical Physics
   
1984-1988 Research Associate at the University Leipzig
Mar 1989 Leaving the former German Democratic Republic
1989-1993 Research Associate at the University Bayreuth
1993-1997 Assistant Lecturer at the University Bayreuth
1998/1999 Guest Professor at the University of Saarland
1997-2002 Lecturer at the University Bayreuth
2002 Full Professor at the Ernst-Moritz-Arndt University Greifswald - Complex Quantum Systems -
Dec 2002 Turned down a professorship in Theoretical Physics at the Technical University Graz
2004-2017 Member of the Faculty Board (mathematics - natural sciences)
2005-2016 Member of the executive committee of the Collaborative Research Center Transregio 24 "Fundamentals of Complex Plasmas"
Feb 2005 Gordon Godfrey Visiting Professorship at the University of New South Wales, Sydney
2005-2009 Vice-chairman of the scientific board of the Institute of Low Temperature Plasma Physics
Jan-Mar 2011 Professorial Visiting Fellow, School of Physics, University of New South Wales, Sydney, Australia
2012-2017 Club member of the Leibniz Institute for Plasma Science and Technology
2012-2017 Member of the executive committee of the International Helmholtz Graduate School for Plasma Physics
2012-2017 Executive Director Institute of Physics
2011- Member of the Steering Commitee of the Supercomputing Centre Stuttgart
   

Longer Visits Abroad:

Los Alamos National Laboratory, Czech Academy of Sciences Prague, University of New South Wales Sydney