On the pseudo-fermion representation of the Kondo Hamiltonian

Fabio Bagarello

After a short abstract introduction on the time evolution driven by non-self-adjoint Hamiltonians, we show how the recently introduced concept of pseudo-fermion can be used in the description of damping in finite dimensional quantum systems, and we compare the results deduced adopting the Schrödinger and the Heisenberg representations.

Kenneth Geddes Wilson

F. Bagarello

After a short abstract introduction on the time evolution driven by non-self-adjoint Hamiltonians, we show how the recently introduced concept of pseudo-fermion can be used in the description of damping in finite dimensional quantum systems, and we compare the results deduced adopting the Schrödinger and the Heisenberg representations.

Krishna Das, S. Ramasesha

Mikhail N. Kiselev, Heiko Feldmann, R. Oppermann

Omar Morandi, Paul-Antoine Hervieux, Giovanni Manfredi

A straightforward limit procedure is developed for evaluating the expectation value of a generic many-particle operator defined in the Abrikosov-Coleman’s pseudo-fermion formalism. It can be useful for the study of nonequilibrium \nKondo-type problems.