Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Spin-Dynamics / Spin-Torque I

MA 2.5: Vortrag

Montag, 23. März 2009, 12:00–12:15, HSZ 04

Spatial handling of Bose-Einstein condensate of magnons — •Oleksandr Dzyapko, Vladislav E. Demidov, and Sergej O. Demokritov — Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Münster, Deutschland

After the experimental observation of Bose-Einstein condensation (BEC) of atoms and quasi-particles manipulating the condensate as a single whole and the study of interaction between two or more condensates are of particular interest. However, experimental results only for atomic condensate were reported. Recently discovered room temperature BEC of magnons driven by a microwave pumping [1] opens a new way for manipulation of condensates of quasi-particles. Here we demonstrate a way to create simultaneously two condensates of magnons separated in space and report the study of their spatial evolution using the space- and time-resolved Brillouin light scattering spectroscopy. Two separate condensates were created along the opposite edges of a microstrip resonator, which has a width of 500 mkm. The presented results show that, whereas the spatial separation between the condensates is determined by the width of the resonator, the width of each condensate depends on the applied microwave pumping power. Thus, varying the power and the width of the resonator one can handle the dimensions and the separation of the condensates which gives a convenient tool for realization of a magnon Josephson junction.

1. S.O. Demokritov, V.E. Demidov, O. Dzyapko, G.A. Melkov, A.A. Serga, B. Hillebrands, and A.N. Slavin, Nature 443, 430 (2006).