Johannes Hofmann

Optical evidence for a Weyl semimetal state in pyrochlore Eu2Ir2O7

A Weyl semimetallic state with pairs of nondegenerate Dirac cones in three dimensions was recently predicted to occur in the antiferromagnetic state of the pyrochlore iridates. Here, we show that the THz optical conductivity and temperature dependence of the free carrier response in pyrochlore

Why does graphene behave as a weakly interacting system

{\mathrm{Eu}}_{2}{\mathrm{Ir}}_{2}{\mathrm{O}}_{7}

Quantum anomaly, universal relations and breathing mode of a two-dimensional Fermi gas

match the predictions for a Weyl semimetal and suggest novel Dirac liquid behavior. The interband optical conductivity vanishes continuously at low frequencies signifying a semimetal. The metal-semimetal transition at

Plasmon signature in Dirac-Weyl liquids

{T}_{N}=110

Current response, structure factor and hydrodynamic quantities of a two- and three-dimensional Fermi gas from the operator-product expansion

K is manifested in the Drude spectral weight, which is independent of temperature in the metallic phase and decreases smoothly in the ordered phase. The temperature dependence of the free carrier weight below

Many-body effects and ultraviolet renormalization in three-dimensional Dirac materials

{T}_{N}

Surface plasmon polaritons in topological Weyl semimetals

is in good agreement with theoretical predictions for a Dirac material. The data yield a Fermi velocity

Efimov correlations in strongly interacting Bose gases

{v}_{F}\ensuremath{\approx}4\ifmmode\times\else\texttimes\fi{}{10}^{7}

Non-Markovian Quantum Friction of Bright Solitons in Superfluids

cm/s, a logarithmic renormalization scale

Pairing effects in the nondegenerate limit of the two-dimensional Fermi gas

{\mathrm{\ensuremath{\Lambda}}}_{L}\ensuremath{\approx}600