Cooperative polariton dynamics in feedback-coupled cavities

Bimu Yao, Y. S. Gui, J. W. Rao, S. Kaur, X. S. Chen, W. Lu (), Y. Xiao, H. Guo, K. -P. Marzlin and C. -M. Hu ()
Additional contact information
Bimu Yao: University of Manitoba
Y. S. Gui: University of Manitoba
J. W. Rao: University of Manitoba
S. Kaur: University of Manitoba
X. S. Chen: Chinese Academy of Sciences
W. Lu: Chinese Academy of Sciences
Y. Xiao: Nanjing University of Aeronautics and Astronautics
H. Guo: McGill University
K. -P. Marzlin: St. Francis Xavier University
C. -M. Hu: University of Manitoba

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract The emerging field of cavity spintronics utilizes the cavity magnon polariton (CMP) induced by magnon Rabi oscillations. In contrast to a single-spin quantum system, such a cooperative spin dynamics in the linear regime is governed by the classical physics of harmonic oscillators. It makes the magnon Rabi frequency independent of the photon Fock state occupation, and thereby restricts the quantum application of CMP. Here we show that a feedback cavity architecture breaks the harmonic-oscillator restriction. By increasing the feedback photon number, we observe an increase in the Rabi frequency, accompanied with the evolution of CMP to a cavity magnon triplet and a cavity magnon quintuplet. We present a theory that explains these features. Our results reveal the physics of cooperative polariton dynamics in feedback-coupled cavities, and open up new avenues for exploiting the light–matter interactions.

Date: 2017
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DOI: 10.1038/s41467-017-01796-7

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