Strong electric field annihilation by particle–antiparticle pair creation, also known as the
Schwinger effect, is a non-perturbative prediction of quantum electrodynamics. Its …

Topological semimetals with massless Dirac and Weyl fermions represent the forefront of
quantum materials research. In two dimensions, a peculiar class of fermions that are …

The magneto-optical properties of (001)-oriented NbAs single crystals have been studied in
the spectral range from 5 to 150 meV and in magnetic fields of up to 13 T. A rich spectrum of …

In this work we investigate the effect of a constant external, or artificial, magnetic field on the
nonlinear response of two-dimensional (2D) Weyl materials. We calculate the Landau levels …

We measured the magneto-reflectivity spectra (4–90 meV, 0–16 T) of the triple-point
semimetal GdPtBi and found them to demonstrate two unusual broad features emerging in …

Odd-frequency superconductivity is an exotic superconducting state in which the symmetry
of the gap function is odd in frequency. Here, we show that an inherent odd-frequency mode …

TlBiSSe is a rare realization of a 3D semimetal with a conically dispersing band that has an
optical response which is well isolated from other contributions in a broad range of photon …

This doctoral thesis focuses on the study of bulk (3D) materials with strongly non-
parabolic/linear (Dirac) energy band structure and explores the validity of the relativistic …

TlBiSSe is a rare realization of a three-dimensional semimetal with a conically dispersing
band that has an optical response which is well isolated from other contributions in a broad …

This thesis covers theoretical and optical studies on a selection of topological materials,
namely the compounds TaP, NbAs, and GdPtBi. Topology in condensed matter physics is a …