Abstract
The new field of spin cavitronics focuses on the interaction between the magnon excitation of a magnetic element and the electromagnetic wave in a microwave cavity. In the strong interaction regime, such an interaction usually gives rise to the level anticrossing for the magnonic and the electromagnetic mode. Recently, the attractive level crossing has been observed, and it is explained by a non-Hermitian model Hamiltonian. However, the mechanism of such attractive coupling is still unclear. We reveal the secret by using a simple model with two harmonic oscillators coupled to a third oscillator with large dissipation. We further identify this dissipative third party as the invisible cavity mode with large leakage in cavity-magnon experiments. This understanding enables one to design dissipative coupling in all sorts of coupled systems.
| Original language | English |
|---|---|
| Article number | 227201 |
| Journal | Physical Review Letters |
| Volume | 123 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - 26 Nov 2019 |
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In: Physical Review Letters, Vol. 123, No. 22, 227201, 26.11.2019.
Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Prediction of attractive level crossing via a dissipative mode
AU - Yu, Weichao
AU - Wang, Jiongjie
AU - Yuan, H. Y.
AU - Xiao, Jiang
N1 - Funding Information: The level attraction via a dissipative mode is a general physical principle, which can be applied to a wide range of coupled physical systems. For example, either the oscillator or the dissipative third party can be a superconducting qubit [6,29] , a dielectric nanostructure [30] , an antiferromagnet [31,32] , a high-order spin wave mode [33] , or another excitation such as a phonon [34] . It has been reported recently that magnetic textures can also be coupled with the cavity photons [35,36] . Based on the understanding of dissipative coupling, the nonlinear effect [37,38] and topological properties of the exceptional point [39–42] can be generalized, and new physics is expected. In conclusion, we found that the mechanism for the dissipative coupling in many physical systems can be captured by an effective three-oscillator model, where two oscillators of interests are coupled to a common third oscillator with strong dissipation. We verify this model in both classical and quantum setups. Based on this model, we are able to explain the exact physical mechanisms behind the level-attraction experiments carried out in cavity-magnon systems, where a hidden cavity mode with large dissipation is responsible for mediating the dissipative coupling. This work was supported by the National Natural Science Foundation of China (Grants No. 11722430, No. 11847202, and No. 61704071). W. Y. is also supported by the China Postdoctoral Science Foundation under Grant No. 2018M641906. J. X. is also supported by the Shuguang Program of the Shanghai Education Development Foundation and the Shanghai Municipal Education Commission. [1] 1 C. Kittel , Phys. Rev. 73 , 155 ( 1948 ). PHRVAO 0031-899X 10.1103/PhysRev.73.155 [2] 2 Ö. O. Soykal and M. E. Flatté , Phys. Rev. Lett. 104 , 077202 ( 2010 ). PRLTAO 0031-9007 10.1103/PhysRevLett.104.077202 [3] 3 H. Huebl , C. W. Zollitsch , J. Lotze , F. Hocke , M. Greifenstein , A. Marx , R. 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PY - 2019/11/26
Y1 - 2019/11/26
N2 - The new field of spin cavitronics focuses on the interaction between the magnon excitation of a magnetic element and the electromagnetic wave in a microwave cavity. In the strong interaction regime, such an interaction usually gives rise to the level anticrossing for the magnonic and the electromagnetic mode. Recently, the attractive level crossing has been observed, and it is explained by a non-Hermitian model Hamiltonian. However, the mechanism of such attractive coupling is still unclear. We reveal the secret by using a simple model with two harmonic oscillators coupled to a third oscillator with large dissipation. We further identify this dissipative third party as the invisible cavity mode with large leakage in cavity-magnon experiments. This understanding enables one to design dissipative coupling in all sorts of coupled systems.
AB - The new field of spin cavitronics focuses on the interaction between the magnon excitation of a magnetic element and the electromagnetic wave in a microwave cavity. In the strong interaction regime, such an interaction usually gives rise to the level anticrossing for the magnonic and the electromagnetic mode. Recently, the attractive level crossing has been observed, and it is explained by a non-Hermitian model Hamiltonian. However, the mechanism of such attractive coupling is still unclear. We reveal the secret by using a simple model with two harmonic oscillators coupled to a third oscillator with large dissipation. We further identify this dissipative third party as the invisible cavity mode with large leakage in cavity-magnon experiments. This understanding enables one to design dissipative coupling in all sorts of coupled systems.
UR - http://www.scopus.com/inward/record.url?scp=85076283146&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.123.227201
DO - 10.1103/PhysRevLett.123.227201
M3 - Article
C2 - 31868418
AN - SCOPUS:85076283146
SN - 0031-9007
VL - 123
JO - Physical Review Letters
JF - Physical Review Letters
IS - 22
M1 - 227201
ER -