Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.38: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Magnon-polariton experiments at milliKelvin temperatures — •Marco Pfirrmann1, Julius Krause1, Yannick Schön1, Isabella Boventer2, Andre Schneider1, Alexey V. Ustinov1, and Martin Weides1,2 — 1Physikalisches Institut, Karlsruhe Institute of Technology — 2Institute of Physics, Johannes Gutenberg University Mainz
While magnon dynamics in ferromagnetic materials has been studied for decades with respect to ferromagnetic resonances, Bose-Einstein condensation, and spintronics, there has been recent progress towards studying collective spin excitations in the quantum regime. Strongly coupled quantum hybrid systems of microwave photons and magnons (magnon-polaritons) mediate the interaction between well-controlled superconducting quantum-circuits and magnetic materials.
An important criterion for possible applications in quantum information processing is the magnon resonance linewidth, the information on the lifetime of a quantum memory. We investigate a strongly coupled hybrid system consisting of a YIG sphere and a 3D microwave cavity. We focus on temperature dependent magnon-polariton properties obtained by spectroscopic measurements at temperatures between 25 and 1600 mK. The coupling and the internal linewidths of resonator and magnon resonances are obtained by fitting the full complex scattering parameter using Input-Output-formalism adapted from quantum optics.