Resonances in two electron quantum dots and near-threshold behavior of few-body systems

FEDERICO M. PONT; OMAR OSENDA; JULIO H. TOLOZA; PABLO SERRA

Rio de Janeiro

Taller; 4th ICAM/FAPERJ Summer School - New Phenomena in Quantum Matter; 2010

Resonance states of a two-electron quantum dots are studied using avariational expansion with both real basis-set functions and complexscaling methods. The two-electron entanglement (linear entropy) is calculatedas a function of the electron repulsion at both sides of the critical value,where the ground (bound) state becomes a resonance (unbound) state. The linearentropy and fidelity and double orthogonality functions are comparedas methods for the determination of the real part of the energy of a resonance. The complex linear entropy of a resonance state is introduced using complexscaling formalism.