4 papers
About non-relativistic quantum mechanics and electromagnetism
Ladislaus Alexander Bányai, Mircea Bundaru
We describe here the coherent formulation of electromagnetism in the non-relativistic quantum-mechanical many-body theory of interacting charged particles. We use the mathematical…
A field-theoretical approach to non-relativistic QED
Ladislaus Alexander Banyai, Mircea Bundaru
We give here a field-theoretical derivation of the Hamiltonian of the non-relativistic quantum electrodynamics in the Coulomb gauge using the Lagrange formalism. It leads to the sa…
Interference effects at electron tunneling
N. Angelescu, M. Bundaru, R. Bundaru +1
Two infinite, two-dimensional, lattice, free fermion systems, initially in different invariant states, are allowed to communicate via two point contacts, through which direct tunne…
Linear Response in the s.c. Bogolyubov model of Bose-Einstein Condensation
L. Banyai, M. A. Bundaru, P. Gartner
We discuss the linear response of the Bogolyubov theory of a weakly interacting Bose gas below the critical temperature. The specific aspects, due to induced perturbation terms in…