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Skoltech Colloquium

Guest Speaker: Professor Sergej Demokritov, Institute for Applied Physics, University of Muenster, Germany. Sergej (born in Russia) is the leader of the “Nonlinear magnetic dynamics” group at University of Muenster. His main scientific interests lie in the dynamics of magnetic nanosystems, quantum magnetic thermodynamics, magnetic memory, sensorics and high frequency signal processing. The group is the world leader in the nonlinear dynamics and quantum thermodynamics of magnetic systems.

When: Sept. 26; 4:00pm

Where: Kapitza Institute for Physical Problems; 2nd floor (Kosygina street, 2)

What: Bose-Einstein condensation of magnons and spatio-temporal dynamics of magnon condensate.
Abstract: : Magnons are the quanta of magnetic excitations in a magnetically ordered media. In thermal equilibrium, they can be considered as a gas of quasiparticles obeying the Bose-Einstein statistics with zero chemical potential and a temperature dependent density. We will discuss the room-temperature kinetics and thermodynamics of the magnons gas in yttrium iron garnet films driven by a microwave pumping and investigated by means of the Brillouin light scattering spectroscopy. We show that the thermalization of the driven gas results in a quasi-equilibrium state described the Bose-Einstein statistics with a non-zero chemical potential, the latter being dependent on the pumping power. For high enough pumping powers Bose-Einstein condensation (BEC) of magnons can be experimentally achieved at room temperature. Spatio-temporal kinetics of the BEC-condensate will be discussed in detail. Among others interference of two condensates, vortices, and propagating waves of the condensate density will be addressed.

For Students, Faculties and Postdocs transfer will be arranged.
From Skoltech to Kapitza Institute for Physical Problems bus at 14:45. Bus will wait for you near the Karacorum building (zero floor

How to get to Kapitza Institute for Physical Problems:
Address: 2 ul. Kosygina Moscow (ул. Косыгина,2)
Map: http://goo.gl/maps/1USoZ
You can park in front of the Institute’s gates.

Recording of prof. Sergej Demokritov presentation

If you like to participate and for further information or questions, please Liliya Abaimova
We look forward to seeing you.

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