Hamiltonian Flow in Condensed Matter Physics
作者： F. Wegner
DOI: 10.1007/978-3-662-08973-6_4
关键词: Unitary transformation 、 Physics 、 Hamiltonian (quantum mechanics) 、 Condensed matter physics 、 Fermion
摘要: A recently developed method to diagonalize or block-diagonalize Hamiltoni-ans by means of an appropriate continuous unitary transformation is reviewed. Two applications in condensed matter physics are given as examples: (i) the interaction n-orbital model fermions limit large n brought block-diagonal form, and (ii) generation effective attractive two-electron due elimination electron-phonon given. The advantage this particular comparison conventional perturbation theory pointed out.
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