# OUR WEBPAGE HAS MOVED, THE NEW ADRESS IS www.ur.de/physik/evers

Material sciences deliver novel material classes like topological insulators or graphene; the nanosciences provide measurements of single molecules and atoms. We investigate such systems with computational means. Our emphasis is on transport and dynamics.

# News

## Recent Publications

• J. Wilhelm, P. Grössing, A. Seith, J. Crewse, M. Nitsch, L. Weigl, C. Schmid and F. Evers: Semiconductor Bloch-equations formalism: Derivation and application to high-harmonic generation from Dirac fermions, Phys. Rev. B 103, 125419 (2021).

• S. Nandy, F. Evers, S. Bera: Dephasing in strongly disordered interacting quantum wires, Phys. Rev. B 103, 085105 (2021).

• M. Camarasa-Gómez, D. Hernangómez-Pérez, M. S. Inkpen, G. Lovat, E.-D. Fung, X. Roy, L. Venkataraman, F. Evers: Mechanically Tunable Quantum Interference in Ferrocene-Based Single-Molecule Junctions, Nano Lett. 20, 6381-6386 (2020).

# Open projects

We are very happy to welcome students. Please find exemplary projects below:

# Research agenda

## High-Harmonic Generation in Solids

Absorption and emission of light in the bandstructure of a solid.

When irradiating solids with a laser pulse of frequency $\omega$, the emitted radiation can feature high-harmonic frequencies $n\omega,n\in\mathbb{N}$. We simulate high-harmonic generation by electron quantum dynamics to explore exciting physics in exotic materials.

## Molecular Electronics

Typical setup of a molecular transport experiment.

Molecules represent classes of quantum dots that exhibit unique properties. A profound fundamental interest is especially in molecular systems close to instabilities, because the latter tend to leave a pronounced effects on the transport characteristics.

## Molecular Materials and Their Cooperative Phenomena

Graphene flake with zigzag termination and buckling.

Molecular Materials comprise a broad class of solids including graphene, supramolecular structures and hypothetical metamaterials. Their cooperative properties are rich, tunable and can often be obtained quantitatively with sophisticated ab intio methods.

## Anderson Transitions and Quantum Criticality in Novel Materials: Topological Insulators, Graphene and Friends

Electronic wavefunction near a Quantum Hall transition exhibiting multifractal amplitude fluctuations.

Disorder of some kind is a ubiquitous encounter in any macroscopic solid. From the fundamental point of view it creates novel material classes where interference, quantum phase transitions and the physics of rare events dominate the phase diagrams.

## Low-scaling GW calculations

'GW meter': Computational cost of GW can be reduced from $O(N^4)$ to $O(N^2)$.

GW is the state-of-the-art method to compute band structures of solids. Today's largest supercomputers are required, when applying GW to systems with more than ten atoms. We work on a low-scaling GW algorithm to enable GW for thousands of atoms.

## Principal investigator

Prof. Dr. Ferdinand Evers
Office: PHY 3.1.25

##### Contact
Email: ferdinand.evers(at)ur.de
Phone: +49 (0)941 943 2039
Fax: +49 (0)941 943 2038
Secretary: +49 (0) 941 943 2036