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The derivation of effective hamiltonians

✍ Scribed by Carlos E. Soliverez

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
229 KB
Volume
79
Category
Article
ISSN
0375-9601

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πŸ“œ SIMILAR VOLUMES

Connections between perturbation theory
Connections between perturbation theory and the unitary transformation methods of deriving effective Hamiltonians
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## Abstract The connections between open shell Brillouin–Wigner perturbation theory and the Van Vleck unitary transformation formalisms for generating effective Hamiltonians are explored. An explicit expression is obtained relating the generator __Ŝ__ of the unitary transformation __e__^__iŝ__^ wit

On the Derivation and the Properties of
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## Abstract The lowest eigenvalues of Frohlich's Hamiltonian with a magnetic field are approximately determined by solving the eigenvalue problem of an effective Hamiltonian for a polaron in a magnetic field. The effective Hamiltonian can be diagonalized without approximations, and the eigenvalue p