Abstract
A method to diagonalize or block-diagonalize Hamiltonians by means of an appropriate continuous unitary transformation is reviewed. Main advantages among others are: (i) In perturbation theory one obtains new results for effective interactions which are less singular than those obtained by conventional perturbation theory, eg. for the effective pair interaction by eliminating the electron-phonon interaction. (P. Lenz and F.W.) (ii) In systems with impurities as for example in the spin-boson problem large parameter regions can be treated in a consistent way (S. Kehrein and A. Mielke).
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Wegner, F. (2000). Flow equations for Hamiltonians. In: Kramer, B. (eds) Advances in Solid State Physics 40. Advances in Solid State Physics, vol 40. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0108350
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DOI: https://doi.org/10.1007/BFb0108350
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