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.
Campisi M.,University of Augsburg
New Journal of Physics | Year: 2013
New quantum fluctuation relations are presented. In contrast with the standard approach, where the initial state of the driven system is described by the (micro) canonical density matrix, here we assume that it is described by a (micro) canonical distribution of wave functions, as originally proposed by Schrödinger. While the standard fluctuation relations are based on von Neumann measurement postulate, these new fluctuation relations do not involve any quantum collapse, but involve instead a notion of work as the change in expectation of the Hamiltonian. © IOP Publishing and Deutsche Physikalische Gesellschaft.
Li L.,Massachusetts Institute of Technology |
Richter C.,University of Augsburg |
Mannhart J.,Max Planck Institute for Solid State Research |
Ashoori R.C.,Massachusetts Institute of Technology
Nature Physics | Year: 2011
A two-dimensional electronic system forms at the interface between the band insulators1,2 LaAlO3 and SrTiO3. Samples fabricated until now have been found to be either magnetic or superconducting, depending on growth conditions3,4. Combining high-resolution magnetic torque magnetometry and transport measurements, we report here magnetization measurements providing direct evidence of magnetic ordering of the two-dimensional electron liquid at the interface. The magnetic ordering exists from well below the superconducting transition to up to 200 K, and is characterized by an in-plane magnetic moment. Surprisingly, despite the presence of this magnetic ordering, the interface superconducts below 120 mK. This is unusual because conventional superconductivity rarely exists in magnetically ordered metals5,6. Our results suggest that there is either phase separation or coexistence between magnetic and superconducting states. The coexistence scenario would point to an unconventional superconducting phase as the ground state. © 2011 Macmillan Publishers Limited. All rights reserved.
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.
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.
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.