Post Doctoral Fellow

Research group: Condensed Matter

Research interests:

My research is focused on the theoretical investigation of strongly correlated materials, e.g. rare-earth permanent magnets or correlated color pigments. In this context, I am using density functional theory (DFT), many-body perturbation theory (GW) and dynamical mean-field theory (DMFT), and I am developing further methods beyond DMFT.
I studied Physics at Vienna University of Technology, where I obtained my M.Sc. in 2013 and my PhD in 2017. During my PhD, I have developed a new method for strongly correlated materials, the ab-initio dynamical vertex approximation. The latter is a diagrammatic extension of DMFT that makes it possible to treat materials with non-local electronic correlations and a non-local effective Coulomb interaction.
Currently, I am investigating the role of electronic correlations in rare-earth-based permanent magnets. My project is part of a joint ANR-DFG research project whose aim is to identify or even design new materials for permanent magnet applications. Furthermore, I am studying the optical properties of correlated pigment materials, among them certain rare-earth fluorosulfides and rare-earth cuprates. These novel pigment materials show brilliant colors and might be good alternatives for conventional pigments that often contain toxic heavy metals.
I am also interested in electronic entanglement in the solid state (e.g. fermionic entanglement measures) and its connection to quantum information. Not at last, I also have a background (B.A.) in philosophy and I like to think and read about questions related to the foundations of physics and the relation to other - in particular philosophical - approaches to the world.
Phone number +33(0) 1 69 33 42 81
Address CPHT, Ecole Polytechnique, 91128 Palaiseau cedex, France
Office 'Aile 0', office 1006


Thesis: "Towards an ab-initio treatment of materials with local and non-local electronic correlations”, supervised by Prof. Karsten Held, TU Vienna (2017)


A. Galler, J. Kaufmann, P.Gunacker, M. Pickem, P. Thunström, J. M. Tomczak, and K. Held
Towards ab initio calculations with the dynamical vertex approximation
J. Phys. Soc.Jpn. 87, 041004 (2018)

A. Galler, P. Thunström, P. Gunacker, J. M. Tomczak, and K. Held
Ab initio dynamical vertex approximation
Phys. Rev. B 95, 115107 (2017)

A. Galler, C. Taranto, M. Wallerberger, M. Kaltak, G. Kresse, G.Sangiovanni, A. Toschi, and K. Held
Screened moments and absence of ferromagnetism in FeAl
Phys. Rev. B 92, 205132 (2015)