Study of Bose-Einstein condensate of magnons by means of fs-laser Faraday magnetometry

• Applicant: Professor Sergej O. Demokritov, Ph.D.
• Subject Area: Experimental Condensed Matter Physics
• Term: from 2011 to 2015
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 183069271

Subject of this project is the experimental investigation of the degree of coherence in the Bose-Einstein condensate – a recently discovered novel state of a magnon gas. A combined heterodyne scheme employing a repetitive sequence of fs-laser pulses, allowing an ultimate frequency resolution, will be applied as the experimental tool. The main question to answer will be: how the finite lifetime of magnons and their mutual interaction influences the coherent properties of the condensate. Here we plan to join the expertise of the Münster Group in experimental study of coherent magnon states with the excellence of the Nijmegen Group in investigation and manipulation of high frequency dynamics, magneto-optics and opto-magnetism.

• DFG Programme: Research Grants
• International Connection: Netherlands
• Major Instrumentation: Microwave setup for magnon pumping a) synthesized microwave generator, b) high-power amplifier c)Pulse generator d) digital oscilloscope e) sm components ; Spectrum analyzer
• Instrumentation Group: 6040 Frequenz-Umformer (statisch) und Hochfrequenzgeneratoren ; 6380 Frequenzanalysatoren, Schwingungsanalysatoren
• Participating Person: Professor Dr. Theo Rasing