New physics in high Landau levels

New Physics and the Landau Pole

In scalar field theories the Landau pole is an ultraviolet singularity in the running coupling constant that indicates a mass scale at which the theory breaks down and new physics must intervene. However, new physics at the pole will in general affect the running of the low energy coupling constant, which will in turn affect the location of the pole and the related upper limit (“triviality” bou...

Coulomb drag in high Landau levels

I. V. Gornyi,1,* A. D. Mirlin,1,2,† and F. von Oppen3,4 1Institut für Nanotechnologie, Forschungszentrum Karlsruhe, D-76021 Karlsruhe, Germany 2Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany 3Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel 4Institut für Theoretische Physik, Freie Universität Berlin, ...

Oscillating sign of drag in high Landau levels.

Motivated by experiments, we study the sign of the Coulomb drag voltage in a double layer system in a strong magnetic field. We show that the commonly used Fermi golden rule approach implicitly assumes a linear dependence of intralayer conductivity on density, and is thus inadequate in strong magnetic fields. Going beyond this approach, we show that the drag voltage commonly changes sign with d...

Is There Physics in Landau Poles?

Triviality and Landau poles are often greeted as harbingers of new physics at 1 TeV. After briefly reviewing the ideas behind this, a model of singular quantum mechanics is introduced. Its ultraviolet structure, as well as some features of its vacuum, related to triviality, very much parallel λφ. The model is solvable, exactly and perturbatively, in any dimension. From its analysis we learn tha...

Exploring new frontiers in statistical physics with a new, parallel Wang-Landau framework