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| Format: | Preprint |
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2024
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| Online-Zugang: | https://arxiv.org/abs/2404.03727 |
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| _version_ | 1866912532611989504 |
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| author | Roca-Jerat, Sebastián Rubín-Osanz, Marcos Jenkins, Mark D. Camón, Agustín Alonso, Pablo J. Zueco, David Luis, Fernando |
| author_facet | Roca-Jerat, Sebastián Rubín-Osanz, Marcos Jenkins, Mark D. Camón, Agustín Alonso, Pablo J. Zueco, David Luis, Fernando |
| contents | We explore the competition between light-mediated and intrinsic matter-matter interactions in waveguide quantum electrodynamics. For this, we couple a superconducting transmission line to a model magnetic material, made of organic free radical molecules with a spin $S=1/2$ and a $g_{S}$ factor very close to that of a free electron. The microwave transmission has been measured in a wide range of temperatures ($0.013$ K $\leq T \leq 2$ K), magnetic fields ($0\leq B \leq 0.5$ T) and frequencies ($0 \leq ω/2 π\leq 14$ GHz). We find that molecules belonging to one of the two crystal sublattices form one-dimensional spin chains. Temperature then controls the intrinsic correlations along these chains in a continuous and monotonic way. In the paramagnetic region ($T > 0.7$ K), the microwave transmission shows evidences for the collective coupling of quasi-identical spins to the propagating photons, with coupling strengths that reach values close to the dissipation rates. As $T$ decreases, the growth of spin correlations, combined with the anisotropy in the spin-spin exchange constants, tend to suppress the collective spin-photon coupling. In this regime, the spin visibility in transmission reflects also a gradual change in the nature of the dominant spin excitations, from single spin flips to bosonic magnons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_03727 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Waveguide quantum electrodynamics at the onset of spin-spin correlations Roca-Jerat, Sebastián Rubín-Osanz, Marcos Jenkins, Mark D. Camón, Agustín Alonso, Pablo J. Zueco, David Luis, Fernando Quantum Physics Materials Science We explore the competition between light-mediated and intrinsic matter-matter interactions in waveguide quantum electrodynamics. For this, we couple a superconducting transmission line to a model magnetic material, made of organic free radical molecules with a spin $S=1/2$ and a $g_{S}$ factor very close to that of a free electron. The microwave transmission has been measured in a wide range of temperatures ($0.013$ K $\leq T \leq 2$ K), magnetic fields ($0\leq B \leq 0.5$ T) and frequencies ($0 \leq ω/2 π\leq 14$ GHz). We find that molecules belonging to one of the two crystal sublattices form one-dimensional spin chains. Temperature then controls the intrinsic correlations along these chains in a continuous and monotonic way. In the paramagnetic region ($T > 0.7$ K), the microwave transmission shows evidences for the collective coupling of quasi-identical spins to the propagating photons, with coupling strengths that reach values close to the dissipation rates. As $T$ decreases, the growth of spin correlations, combined with the anisotropy in the spin-spin exchange constants, tend to suppress the collective spin-photon coupling. In this regime, the spin visibility in transmission reflects also a gradual change in the nature of the dominant spin excitations, from single spin flips to bosonic magnons. |
| title | Waveguide quantum electrodynamics at the onset of spin-spin correlations |
| topic | Quantum Physics Materials Science |
| url | https://arxiv.org/abs/2404.03727 |