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  1. No Access

    Chapter

    Quantum Percolation in Disordered Structures

    Many solids, such as alloys or doped semiconductors, form crystals consisting of two or more chemical species. In contrast to amorphous systems, they show a regular, periodic arrangement of sites but the diffe...

    G. Schubert, H. Fehske in Quantum and Semi-classical Percolation and… (2009)

  2. No Access

    Chapter

    Numerical Solution of the Holstein Polaron Problem

    Noninteracting itinerant electrons in a solid occupy Bloch one-electron states. Phonons are collective vibrational excitations of the crystal lattice. The basic electron-phonon (EP) interaction process is the ...

    H. Fehske, S. A. Trugman in Polarons in Advanced Materials (2007)

  3. No Access

    Chapter and Conference Paper

    Jacobi-Davidson Algorithm with Fast Matrix-Vector Multiplikation on Massively Parallel and Vector Supercomputers

    The exact diagonalization of very large sparse matrices is a numerical problem common to various fields in science and engineering. We present an advanced eigenvalue alorithm - the so-called Jacobi-Davidson al...

    M. Kinateder, G. Wellein, A. Basermann… in High Performance Computing in Science and … (2001)

  4. No Access

    Chapter

    The Phase Diagram of the 2D Holstein-t-J Model

    The importance of both strong antiferromagnetic Coulomb correlations as well as strong electron-phonon (EP) interactions has become increasingly recognized as being essential in understanding the superconducti...

    H. Fehske, H. Röder in Nonlinear Coherent Structures in Physics and Biology (1994)

  5. No Access

    Chapter

    A Variational Slave Boson Approach to the Holstein-Hubbard Model

    Research on the high-T c cuprates has focused, once again, interest on strongly coupled electron-phonon (EP) systems. Although it is widely believed that most o...

    H. Fehske, U. Trapper, M. Deeg, H. Büttner in Nonlinear Coherent Structures in Physics a… (1994)

  6. No Access

    Chapter and Conference Paper

    Some remarks on the spin fluctuation theories for itinerant electrons

    B. Lorenz, H. Fehske in Static Critical Phenomena in Inhomogeneous Systems (1984)