Northwestern Events Calendar

Mar
28
2016

A. Slavn: Coherent excitation of a "magnonic sound"

When: Monday, March 28, 2016
3:00 PM - 4:00 PM CT

Where: Technological Institute, F210, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Public

Contact: Liz Lwanga   (847) 491-3645

Group: Physics and Astronomy Condensed Matter Physics Seminars

Category: Academic

Description:

Title: Coherent excitation of  a "magnonic sound"


Speaker: A. Slavn, University of Muenster


Abstract: We report experiment on coherent excitation of  sound-like waves  in a dense gas of strongly interacting quasiparticles - parametrically pumped microwave magnons undergoing  Bose-Einstein condensation  (BEC) at room temperature .  At low wavenumbers  the discovered “magnonic sound” shows a linear dispersion, which becomes almost quadratic above a certain characteristic wavenumber proportional to the magnon density. The "magnonic sound" is dissipative in a sense that the real and imaginary parts of its wavenumber are comparable.  The observed excitation of sound-like waves finds an explanation within a classical Boltzmann theory modified for the case of a quasi-equilibrium gas of  magnon quasiparticles. 

 

Keywords: Physics, Astronomy, CMP

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