108 citations · 329 across the 7 of their papers we have counts for
4 papers · 1 filter
Equivalence of Particle-Particle Random Phase Approximation Correlation Energy and Ladder-Coupled-Cluster-Double
Degao Peng, Stephan N. Steinmann, Helen van Aggelen +1
We present an analytical proof and numerical demonstrations of the equivalence of the correlation energy from particle-particle random phase approximation (pp-RPA) and ladder-coupl…
Exchange-Correlation Energy from Pairing Matrix Fluctuation and the Particle-Particle Random Phase Approximation
Helen van Aggelen, Yang Yang, Weitao Yang
We formulate an adiabatic connection for the exchange-correlation energy in terms of pairing matrix fluctuation. This connection opens new channels for density functional approxima…
The tensor hypercontracted parametric reduced density matrix algorithm: coupled-cluster accuracy with O(r^4) scaling
Neil Shenvi, Helen Van Aggelen, Yang Yang +3
Tensor hypercontraction is a method that allows the representation of a high-rank tensor as a product of lower-rank tensors. In this paper, we show how tensor hypercontraction can…
Subsystem constraints in variational second order density matrix optimization: curing the dissociative behavior
Brecht Verstichel, Helen van Aggelen, Dimitri Van Neck +2
A previous study of diatomic molecules revealed that variational second-order density matrix theory has serious problems in the dissociation limit when the N-representability is im…