Excited state entanglement on a two-electron system near the ionization threshold

OMAR OSENDA; PABLO SERRA

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

IOP PUBLISHING LTD

Año: 2008 vol. 41 p. 65502 - 65502

0953-4075

We have investigated the critical properties of the lowest energy triplet state  of  the spherical Helium atom. Using finite size scaling methods wecalculate critical charge and critical exponents for  both,the energy and the von Neumann entropy near the ionization threshold.We  show that the scaling properties ofthe energy and the von Neumann entropy for this excited stateare qualitatively different than those obtained for the ground state.These  scaling properties are quantified  in terms of critical exponents, therefore, the analysisis applicable to other few-fermion  systems.