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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Tobar, Michael
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2024Conductivity freeze-out in isotopically pure Si -28 at millikelvin temperaturescitations
- 2019Experimental implementations of cavity-magnon systemscitations
- 2019Low-Temperature Properties of Whispering-Gallery Modes in Isotopically Pure Silicon-28citations
- 2018Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators
- 2018Cavity magnon polaritons with lithium ferrite and three-dimensional microwave resonators at millikelvin temperaturescitations
- 2016A 3D printed superconducting aluminium microwave cavitycitations
- 2016Ultrahigh cooperativity interactions between magnons and resonant photons in a YIG spherecitations
- 2015Discovery of iron group impurity ion spin states in single crystal Y2SiO5 with strong coupling to whispering gallery photonscitations
- 2007Dependence of the dielectric permittivity of single-crystal quartz on thermal deformation at cryogenic temperaturescitations
- 2004The dual-mode frequency-locked technique for the characterisation of the temperature coefficient of permittivity of ainsotropic materialscitations
- 2004Whispering-Gallery Mode Technique Applied to the Measurement of the Dielectric Properties of Langasite Between 4 K and 300 K
- 2004Measurement of the strain-induced coefficient of permittivity of sapphire using whispering gallery modes excited in a high-Q acoustic sapphire oscillatorcitations
- 2001Whispering Gallery Method of Measuring Complex Permittivity in Highly Anisotropic Materials: Discovery of a New Type of Mode in Anisotropic Dielectric Resonatorscitations
- 2000Microwave characterisation of BaCe2Ti5O15 and Ba5Nb4O15 ceramic dielectric resonators using whispering gallery mode methodcitations
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article
Cavity magnon polaritons with lithium ferrite and three-dimensional microwave resonators at millikelvin temperatures
Abstract
<p>Single crystal lithium ferrite (LiFe) spheres of sub-mm dimension are examined at mK temperatures, microwave frequencies, and variable dc magnetic field, for use in hybrid quantum systems and condensed matter and fundamental physics experiments. Strong coupling regimes of the photon-magnon interaction (cavity magnon polariton quasiparticles) were observed with coupling strength of up to 250 MHz at 9.5 GHz (2.6%) with magnon linewidths of order 4 MHz (with potential improvement to sub-MHz values). We show that the photon-magnon coupling can be significantly improved and exceed that of the widely used yttrium iron garnet crystal, due to the small unit cell of LiFe, allowing twice the spins per unit volume. Magnon mode softening was observed at low dc fields and, combined with the normal Zeeman effect, creates magnon spin-wave modes that are insensitive to first-order magnetic-field fluctuations. This effect is observed in the Kittel mode at 5.5 GHz (and another higher order mode at 6.5 GHz) with a dc magnetic field close to 0.19 tesla. We show that if the cavity is tuned close to this frequency, the magnon polariton particles exhibit an enhanced range of strong coupling and insensitivity to magnetic field fluctuations with both first-order and second-order insensitivity to magnetic field as a function of frequency (double magic point clock transition), which could potentially be exploited in cavity QED experiments.</p>