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Reply to “Comment on ‘Nonanalyticity of the optimized effective potential with finite basis sets’ ” (2013)
Journal Article
Gidopoulos, N., & Lathiotakis, N. (2013). Reply to “Comment on ‘Nonanalyticity of the optimized effective potential with finite basis sets’ ”. Physical Review A, 88(4), Article 046502. https://doi.org/10.1103/physreva.88.046502

The Comment by Friedrich et al. does not dispute the central result of our paper [Phys. Rev. A 85, 052508 (2012)] that nonanalytic behavior is present in long-established mathematical pathologies arising in the solution of finite basis optimized effe... Read More about Reply to “Comment on ‘Nonanalyticity of the optimized effective potential with finite basis sets’ ”.

Calculation of electronic excited states of molecules using the Helmholtz free-energy minimum principle (2013)
Journal Article
Pastorczak, E., Gidopoulos, N., & Pernal, K. (2013). Calculation of electronic excited states of molecules using the Helmholtz free-energy minimum principle. Physical Review A, 87(6), Article 062501. https://doi.org/10.1103/physreva.87.062501

We show that the Helmholtz free-energy variational principle is the physical principle underlying the ensemble variational theory formulated in seminal papers by Theophilou and by Gross, Oliveira, and Kohn. A method of calculating electronic excitati... Read More about Calculation of electronic excited states of molecules using the Helmholtz free-energy minimum principle.

Parametric representation of open quantum systems and cross-over from quantum to classical environment (2013)
Journal Article
Calvani, D., Cuccoli, A., Gidopoulos, N., & Verrucchi, P. (2013). Parametric representation of open quantum systems and cross-over from quantum to classical environment. Proceedings of the National Academy of Sciences, 110(17), 6748-6753. https://doi.org/10.1073/pnas.1217776110

The behavior of most physical systems is affected by their natural surroundings. A quantum system with an environment is referred to as open, and its study varies according to the classical or quantum description adopted for the environment. We propo... Read More about Parametric representation of open quantum systems and cross-over from quantum to classical environment.