Achim Rosch

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Achim Rosch (born June 2, 1969 in Buehl) is a German theoretical physicist and professor at the University of Cologne .

Career

Achim Rosch studied physics at the University of Karlsruhe from 1989 to 1994 . In 1997 Peter Wölfle did his doctorate there with the topic: Heavy Particle in a Fermionic Bath . From 1998 to 2000 he was a postdoc at Rutgers University in the USA; On his return he was head of an Emmy-Noether Junior Research Group for Quantum Phase Transitions at the University of Karlsruhe from 2000 to 2003, where he was a substitute professor at the Ludwig-Maximilians-University in Munich in 2002. Rosch has been Professor of Theoretical Physics at the university since 2004 zu Cologne and since 2006 spokesman for the Collaborative Research Center SFB 608 of the University of Cologne with the Rheinische Friedrich-Wilhelms-Universität Bonn on “Complex transition metal compounds with spin and charge degrees of freedom and disorder”; also since 2012 spokesman for “Quantum Matter and Materials” within the Excellence Program of the University of Cologne.

research

Rosch deals with theoretical solid-state physics , in particular with strongly correlated electronic systems, quantum phase transitions, topological insulators , ultra-cold atoms far from equilibrium, transport in quasi-one-dimensional solid-state systems, non- Fermi liquids (such as Luttinger liquids ), mesoscopic solid-state physics.

He works closely with experimenters. He worked with the group of experimental solid-state physicists from Christian Pfleiderer (Technical University of Munich) and Peter Böni (Technical University of Munich) on the first direct detection (with neutron scattering experiments ) of Skyrmion excitations in a solid (a metallic magnet, manganese silicon MnSi). The skyrmions are topologically stable particle-like excitations, turbulence of the spin structure of electrons (clearly magnetic eddies ). They showed the formation of vortex grids similar to those of flux line grids in type II superconductors . Later they found skyrmions in a doped semiconductor. In 2010 they showed that these skyrmions can be manipulated with very small currents, which are five orders of magnitude smaller than the currents otherwise used in spintronics . It is hoped that such experiments will also enable applications in storage technology for data processing. Rosch also studied the emergent electrodynamics that arise when the skyrmions move.

In collaboration with experimenters like Immanuel Bloch , he also investigated the behavior of atoms in optical lattices (generated by standing laser waves) that can be used to simulate solid-state systems. These included phenomena such as negative temperature , hydrodynamic behavior and the Mott transition .

Prices

Individual evidence

  1. ^ A. Neubauer, C. Pfleiderer, B. Binz, A. Rosch, R. Ritz, PG Niklowitz, P. Böni Topological Hall effect in the A-phase of MnSi , Phys. Rev. Lett. 102, 186602 (2009), Arxiv
  2. ↑ Sebastian Mühlbauer , Bintz, Jonietz, Pfleiderer, Rosch, Neubauer, Georgii, Böni Skyrmion lattice in a chiral magnet , Science , Volume 323, 2009, pp. 915-919, Arxiv
  3. ↑ Münzer u. a. Skyrmion lattice in a doped semiconductor , Phys. Rev. B 81, 2010, p. 041203, Arxiv
  4. ↑ F. Jonietz, S. Mühlbauer, C. Pfleiderer, A. Neubauer, W. Münzer, A. Bauer, T. Adams, R. Georgii, P. Böni, RA Duine, K. Everschor, M. Garst, A. Rosch Spin Transfer Torques in MnSi at Ultra-low Current Densities , Science, Volume 330, 2010, p. 1648, Arxiv
  5. ↑ T. Schulz, R. Ritz, A. Bauer, M. Halder, M. Wagner, C. Franz, C. Pfleiderer, K. Everschor, M. Garst, A. Rosch Emergent electrodynamics of skyrmions in a chiral magnet , Nature Physics , 8, 301 (2012), Arxiv
  6. ↑ Rapp, Mandt, Rosch Equilibration Rates and Negative Absolute Temperatures for Ultracold Atoms in Optical Lattices , Phys. Rev. Lett. 105, 220405 (2010), abstract
  7. ↑ The University of Cologne recognizes outstanding achievements ( Memento from March 9, 2012 in the Internet Archive )
  8. ^ EPS Europhysics Prize 2016 from May 25th. 2016

Web links

personal data
SURNAME Rosh, Achim
BRIEF DESCRIPTION German physicist and university professor
DATE OF BIRTH 2nd June 1969
PLACE OF BIRTH Buehl