Entanglement in resonances of two-electron quantum dots

ALEJANDRO FERRÓN, OMAR OSENDA, AND PABLO SERRA

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

AMERICAN PHYSICAL SOCIETY

Año: 2009 vol. 79 p. 325091 - 325096

1050-2947

Bound and resonance states of a two-electron quantum dot are studied using a variational expansion with real basis-set functions. The two-electron entanglement (von Neumann entropy) is calculated as a function of the quantum-dot size at both sides of the critical size, where the ground (bound) state becomes a resonance (unbound) state. The use of von Neumann entropy is proposed as a method for the determination of the energy of a resonance.