Effective Hamiltonian and unitarity of the S matrix

Details Effective Hamiltonian and unitarity of the S matrix Effective Hamiltonian and unitarity of the S matrix

2003-04-29

arxiv.org/abs/quant-ph/0304197v1

Phys.Rev. E68 (2003) 016211

Physics

Quantum Physics

17 pages, 7 figures

Scientific paper

10.1103/PhysRevE.68.016211

The properties of open quantum systems are described well by an effective Hamiltonian ${\cal H}$ that consists of two parts: the Hamiltonian $H$ of the closed system with discrete eigenstates and the coupling matrix $W$ between discrete states and continuum. The eigenvalues of ${\cal H}$ determine the poles of the $S$ matrix. The coupling matrix elements $\tilde W_k^{cc'}$ between the eigenstates $k$ of ${\cal H}$ and the continuum may be very different from the coupling matrix elements $W_k^{cc'}$ between the eigenstates of $H$ and the continuum. Due to the unitarity of the $S$ matrix, the $\TW_k^{cc'}$ depend on energy in a non-trivial manner, that conflicts with the assumptions of some approaches to reactions in the overlapping regime. Explicit expressions for the wave functions of the resonance states and for their phases in the neighbourhood of, respectively, avoided level crossings in the complex plane and double poles of the $S$ matrix are given.

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