Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.26: Poster
Donnerstag, 14. März 2013, 15:00–19:00, Poster D
High cooperativity in a microwave resonator coupled to YIG — H. Huebl1, •J. Lotze1, C. Zollitsch1,2, F. Hocke1, S. T. B. Goennenwein1, and R. Gross1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, Technische Universität München, Garching, Germany
Understanding the coupling of magnetic moments (spins) to light fields (photons) on a quantum level is of fundamental interest. Recent work [1,2] on paramagnetic samples coupled to superconducting resonators has shown coherent coupling between microwave photons and electron spins. This coupling is enhanced compared to a single spin by a factor of √N, where N is the number of spins in the ensemble.
Here [3], we study a bulk ferrimagnetic Ga-doped yttrium iron garnet (YIG) crystal coupled to a superconducting niobium coplanar waveguide resonator operating at 5.9 GHz. Measuring the transmission through the resonator in a magnetic field H, we observe an anticrossing of the spin and photon dispersions with a splitting of 900 MHz. From the H dependence of the resonance linewidths in the interaction regime, we find that the coupling clearly dominates the intrinsic loss rates of the exchange-locked spins and the resonator, with a cooperativity C=1350. This system is therefore well suited for studying the magnon-photon interaction in the strong coupling regime. This work is supported by DFG via SFB 631 and the German Excellence Initiative via NIM.
[1] D. I. Schuster et al., Phys. Rev. Lett. 105, 140501 (2010)
Y. Kubo et al., Phys. Rev. Lett. 105, 140502 (2010)
H. Huebl et al., arXiv:1207.6039 (2012)