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Augsburg, Germany

The University of Augsburg is a university located in the Universitätsviertel section of Augsburg, Germany. It was founded in 1970 and is organized in 7 Faculties.The University of Augsburg is a relatively young campus university with approx. 18,000 students in Oct 2012. About 14% of its students come from foreign countries, a larger percentage than at comparable German universities.In October 2011 Sabine Doering Manteuffel succeeded Alois Loidl as rector of the university. She is the first female rector of a Bavarian university.The current President of Germany Joachim Gauck holds a Doctor honoris causa of the University of Augsburg. Wikipedia.

Mikhailov S.A.,University of Augsburg
Physical Review B - Condensed Matter and Materials Physics | Year: 2014

The microwave-induced resistance oscillations and "zero- resistance" states were discovered in ultraclean two-dimensional electron systems in 2001-2003 and have attracted great interest from researchers. A comprehensive theory of these phenomena was developed in 2011: It was shown that all experimentally observed dependencies can be naturally explained by the influence of the ponderomotive forces which arise in the near-contact regions of the two-dimensional electron gas under the action of microwaves. Now, we show that the same near-contact physical processes should lead to another nonlinear electrodynamic phenomenon: the second-harmonic generation. We calculate the frequency, magnetic field, mobility, and power dependencies of the second-harmonic intensity and show that it can be as large as ≳ 0.5 mW/cm2 under realistic experimental conditions. A part of this paper is devoted to a further development of the ponderomotive-force theory: we show how it explains different experimental details, including those which were not known in 2011. © 2014 American Physical Society. Source

Mikhailov S.A.,University of Augsburg
Physical Review B - Condensed Matter and Materials Physics | Year: 2013

A portion of the electromagnetic wave spectrum between ∼0.1 and ∼10 terahertz (THz) suffers from the lack of powerful, effective, easy-to-use, and inexpensive emitters, detectors, and mixers. We propose a multilayer graphene - boron-nitride heterostructure which is able to emit radiation in the frequency range ∼0.1-30 THz with the power density up to ∼0.5 W/cm2 at room temperature. The proposed device is extremely thin, light, flexible, almost invisible, and may become an important member of the family of devices operating at terahertz frequencies. © 2013 American Physical Society. Source

Zaburdaev V.,Max Planck Institute for the Physics of Complex Systems | Denisov S.,University of Augsburg | Denisov S.,Sumy State University | Klafter J.,Tel Aviv University
Reviews of Modern Physics | Year: 2015

Random walk is a fundamental concept with applications ranging from quantum physics to econometrics. Remarkably, one specific model of random walks appears to be ubiquitous across many fields as a tool to analyze transport phenomena in which the dispersal process is faster than dictated by Brownian diffusion. The Lévy-walk model combines two key features, the ability to generate anomalously fast diffusion and a finite velocity of a random walker. Recent results in optics, Hamiltonian chaos, cold atom dynamics, biophysics, and behavioral science demonstrate that this particular type of random walk provides significant insight into complex transport phenomena. This review gives a self-consistent introduction to Lévy walks, surveys their existing applications, including latest advances, and outlines further perspectives. © 2015 American Physical Society. © 2015 American Physical Society. Source

Eyert V.,University of Augsburg | Eyert V.,Materials Research and Design, Inc.
Physical Review Letters | Year: 2011

New calculations for vanadium dioxide, one of the most controversially discussed materials for decades, reveal that band theory as based on density functional theory is well capable of correctly describing the electronic and magnetic properties of the metallic as well as both the insulating M1 and M2 phases. Considerable progress in the understanding of the physics of VO2 is achieved by the use of the recently developed hybrid functionals, which include part of the electron-electron interaction exactly and thereby improve on the weaknesses of semilocal exchange functionals as provided by the local density and generalized gradient approximations. Much better agreement with photoemission data as compared to previous calculations is found and a consistent description of the rutile-type early transition-metal dioxides is achieved. © 2011 American Physical Society. Source

Braak D.,University of Augsburg
Physical Review Letters | Year: 2011

The Rabi model is a paradigm for interacting quantum systems. It couples a bosonic mode to the smallest possible quantum model, a two-level system. I present the analytical solution which allows us to consider the question of integrability for quantum systems that do not possess a classical limit. A criterion for quantum integrability is proposed which shows that the Rabi model is integrable due to the presence of a discrete symmetry. Moreover, I introduce a generalization with no symmetries; the generalized Rabi model is the first example of a nonintegrable but exactly solvable system. © 2011 American Physical Society. Source

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