Kerr nonlinearity induced strong spin-magnon coupling
- URL: http://arxiv.org/abs/2308.05927v2
- Date: Tue, 28 Nov 2023 01:13:41 GMT
- Title: Kerr nonlinearity induced strong spin-magnon coupling
- Authors: Feng-Zhou Ji, Jun-Hong An
- Abstract summary: Kerr-enhanced spin-magnon coupling invalidates the widely used single-Kittel-mode approximation to magnons.
It is revealed that the spin decoherence induced by the multimode magnons in the strong-coupling regime becomes not severe, but suppressed.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: One pillar of quantum magnonics is the exploration of the utilization of the
mediation role of magnons in different platforms to develop quantum
technologies. The efficient coupling between magnons and various quantum
entities is a prerequisite. Here, we propose a scheme to enhance the
spin-magnon coupling by the magnonic Kerr nonlinearity in a YIG sphere. We find
that the Kerr-enhanced spin-magnon coupling invalidates the widely used
single-Kittel-mode approximation to magnons. It is revealed that the spin
decoherence induced by the multimode magnons in the strong-coupling regime
becomes not severe, but suppressed, manifesting as either population trapping
or persistent Rabi-like oscillation. This anomalous effect is because the spin
changes to be so hybridized with the magnons that one or two bound states are
formed between them. Enriching the spin-magnon coupling physics, the result
supplies a guideline to control the spin-magnon interface.
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