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arXiv · 1911.04408

Pairing correlations and eigenvalues of two-body density matrix in atomic nuclei

Michelangelo Sambataro·Nicolae Sandulescu
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Abstract

The quantum phases of superconductivity and superfluidity are characterised mathematically by the Yang concept of Off-Diagonal Long Range Order (ODLRO), related to the existence of a large eigenvalue of the density matrix. We analyse how the Yang criterion applies for various Hamiltonians commonly employed to describe superfluid-type correlations in atomic nuclei. For like-particle pairing Hamiltonians the behaviour of the largest eigenvalue of two-body density matrix shows a clear evidence for a transition between a normal to a paired phase. However, this is not the case for the isoscalar proton-neutron pairing interactions acting in self-conjugate nuclei.

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Michelangelo Sambataro, Nicolae Sandulescu. 2019-11-11. Pairing correlations and eigenvalues of two-body density matrix in atomic nuclei. https://doi.org/10.1016/j.aop.2019.168061

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