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Why does graphene behave as a weakly interacting system?

- Johannes S. Hofmann, Edwin Barnes, S. Das Sarma
- Physics, MedicinePhysical review letters
- 27 May 2014

TLDR

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

- Johannes S. Hofmann
- Physics, MedicinePhysical review letters
- 6 December 2011

TLDR

High-temperature expansion of the viscosity in interacting quantum gases

- Johannes S. Hofmann
- Physics
- 13 May 2019

The frequency-dependent shear and bulk viscosity spectral functions of an interacting Fermi gas at high temperature are computed using a systematic virial expansion of the stress tensor correlation… Expand

Optical evidence for a Weyl semimetal state in pyrochlore Eu 2 Ir 2 O 7

- A. Sushkov, Johannes S. Hofmann, +4 authors H. Drew
- Physics
- 3 July 2015

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… Expand

Surface plasmon polaritons in topological Weyl semimetals

- Johannes S. Hofmann, S. Sarma
- Physics
- 27 January 2016

We consider theoretically surface plasmon polaritons in Weyl semimetals. These materials contain pairs of band touching points - Weyl nodes - with a chiral topological charge, which induces an… Expand

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

- R. Throckmorton, Johannes S. Hofmann, Edwin Barnes, S. Sarma
- Physics
- 19 May 2015

We develop a theory for electron-electron interaction-induced many-body effects in three dimensional (3D) Weyl or Dirac semimetals, including interaction corrections to the polarizability, electron… Expand

Coarsening dynamics of binary Bose condensates.

- Johannes S. Hofmann, Stefan S. Natu, S. Das Sarma
- Physics, MedicinePhysical review letters
- 5 March 2014

We study the dynamics of domain formation and coarsening in a binary Bose-Einstein condensate that is quenched across a miscible-immiscible phase transition. The late-time evolution of the system is… Expand

Optical evidence for a Weyl semimetal state in pyrochlore Eu2Ir2O7

- A. Sushkov, Johannes S. Hofmann, G. Jenkins, Dennis Drew, J. Ishikawa, S. Nakatsuji
- Physics
- 17 March 2016

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

- Johannes S. Hofmann
- Physics
- 29 June 2011

We apply the operator-product expansion to determine the asymptotic form of the current response of a Fermi gas in two and three dimensions. The leading-order term away from the one-particle peak is… Expand

Plasmon signature in Dirac-Weyl liquids

- Johannes S. Hofmann, S. Sarma
- Physics
- 19 January 2015

We consider theoretically as a function of temperature the plasmon mode arising in three-dimensional Dirac liquids, i.e., systems with linear chiral relativistic single-particle dispersion, within… Expand

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