congresos y reuniones científicas
Resonances in two electron quantum dots and near threshold phenomena of few body systems
FEDERICO M. PONT, OMAR OSENDA, JULIO H. TOLOZA AND PABLO SERRA
Rio de Janeiro
Taller; 4th I2CAM/FAPERJ Summer School - New Phenomena in Quantum Matter; 2010
In this work we study the critical behavior of several few body systems when the energy of the ground state is near the continuum threshold. The work is divided in two sections. In the first one, the stability and critical behavior of screened three body systems with charges (q,q,1) is analyzed. The systems present Borromean binding and Efimov states near the two body ionization threshold. The second part includes the analysis of resonance states of a two electron quantum dot in the effective mass approximation. The resonance arises when the groun state energy is absorbed by the continuum threshold. The two electron entanglement (linear entropy) is calculated as a function of the electron repulsion at bth sides of he critical value, where the ground (bound) state becomes a resonance (unbound) state. The complex linear entropy of a resonance state is introduced using complex scaling formalism.