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University of Regensburg
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Computational Electronic Structure Theory

Physics - Research - Working groups - Computational Electronic Structure Theory

    

Computational Electronic Structure Theory

    
Many phenomena in physics, chemistry and biology are caused by the motion of electrons and nuclei on ultrafast time scales (~ 1 femtosecond = 10-15 s). We study ultrafast phenomena by analytical models and numerical simulations, our main focus is on exploring the motion of electronic excitations in condensed matter. We also develop efficient algorithms from many-body perturbation theory for electron-electron interactions to support our studies on ultrafast dynamics. Our group is part of the Regensburg Center for Ultrafast Nanoscopy (RUN) (external link, opens in a new window).

    

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Ultrafast Electron Dynamics

We study nonequilibrium electron dynamics in solids driven by ultrashort laser pulses. For our studies we use analytical models and numerical simulations.

Electronic Structure Methods

We design efficient algorithms based on many-body perturbation theory to study the interaction of light with crystals, nanostructures and complex interfaces.

News and Highlights

A guide to the capabilities of the open-source CP2K program (external link, opens in a new window)

The CP2K community provides a user-oriented introduction of quantum-mechanical simulations with CP2K, including our recent developments for computing band structures and optical properties of molecules and materials. Many thanks to Thomas Kühne (CASUS & TU Dresden) for coordinating this effort.

   

Journal of Physical Chemistry B 130, 1237 (2026) (external link, opens in a new window) (selected as Editor's Choice)

Probe of Broken Time-Reversal Symmetry (TRS) with Third Harmonics (external link, opens in a new window)

We use third-harmonic Faraday rotation to probe whether TRS is preserved or broken in a crystal: zero rotation shows preserved TRS, non-zero rotation broken TRS (measurements by the group of Giancarlo Soavi, Uni Jena). Our analytical model reveals the microscopic mechanism causing Faraday rotation and shows its dependence on material parameters.

    

Nature Photonics 20, 186 (2026) (external link, opens in a new window)

Band structure calculations on a laptop (external link, opens in a new window)

The GW approximation is the state-of-the-art Green’s-function method for calculating band structures beyond density-functional theory. We develop an atomic-orbital GW algorithm that enables band structure calculations of 2D crystals on a laptop, available open-source in CP2K and orders of magnitude faster than conventional plane-wave GW algorithms.

      

Physical Review B 112, 205130 (2025) (external link, opens in a new window) (selected as Editor's Suggestion)

News and Highlights from previous years
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