Superstrong coupling of a microwave cavity to yttrium iron garnet magnons

被引：150

作者：

Kostylev, Nikita ^{[1
]}

Goryachev, Maxim ^{[1
]}

Tobar, Michael E. ^{[1
]}

机构：

[1] Univ Western Australia, ARC Ctr Excellence Engn Quantum Syst, Sch Phys, 35 Stirling Highway, Crawley, WA 6009, Australia

来源：

APPLIED PHYSICS LETTERS | 2016年 / 108卷 / 06期

基金：

澳大利亚研究理事会;

关键词：

QUANTUM ELECTRODYNAMICS; SYSTEMS; PHOTON;

D O I：

10.1063/1.4941730

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Multiple-post reentrant 3D lumped cavity modes have been realized to design the concept of a discrete Whispering Gallery and Fabry-Perot-like Modes for multimode microwave Quantum Electrodynamics experiments. Using the magnon spin-wave resonance of a submillimeter-sized Yttrium-Iron-Garnet sphere at millikelvin temperatures and a four-post cavity, we demonstrate the ultra-strong coupling regime between discrete Whispering Gallery Modes and a magnon resonance with a strength of 1.84 GHz. By increasing the number of posts to eight and arranging them in a D-4 symmetry pattern, we expand the mode structure to that of a discrete Fabry-Perot cavity and modify the Free Spectral Range (FSR). We reach the superstrong coupling regime, where spin-photon coupling strength is larger than FSR, with coupling strength in the 1.1 to 1.5 GHz range. (C) 2016 AIP Publishing LLC.

引用

页数：4