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arXiv 1801.01439cond-mat.mes-hall
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从milliKelvin到室温腔磁振子耦合和耗散的复温度依赖性

Complex temperature dependence of coupling and dissipation of cavity-magnon polaritons from milliKelvin to room temperature

Isabella Boventer, Marco Pfirrmann, Julius Krause, Yannick Schön, Mathias Kläui, Martin Weides

摘要:

混合磁光子系统是未来信息处理技术的关键组成部分,例如在经典(主要是在室温下)和量子(低温)状态下的数据存储,操作或转换。在这项工作中,我们研究了YIG球强烈耦合到微波腔在整个温度范围内从$290\,\mathrm{K}$到$30\,\mathrm{mK}$。研究了从经典到量子态的腔磁振子极化激元,其中热能小于一个共振微波量子,即在低于$1\,\mathrm{K}$的温度下。我们比较了耦合强度$g_{\rm{eff}}(T)$的温度依赖性,描述自旋系综和腔光子之间的相干能量交换的强度,饱和磁化强度演化$M_{\rm{s}}(T)$的温度行为,并发现在低温下强烈的偏差。磁振子耗散的温度依赖性在中温由稀土杂质散射控制,导致在$40\,$ K处的强峰。在$30\,$ mK处,线宽$κ_{\rm{m}}$减小到$1.2\,$ MHz,使得该系统适合作为量子电动力学实验的构建块。我们在整个温度范围内实现了超过$20$的电磁协同性,在毫开尔文制度以及在室温下的值超过$100$。通过我们的测量,强耦合磁振子-光子系统的光谱学被证明是在大温度范围内研究自旋材料的通用工具。在一次测量中提供了关键参数,从而大大简化了调查。

英文摘要:

Hybridized magnonic-photonic systems are key components for future information processing technologies such as storage, manipulation or conversion of data both in the classical (mostly at room temperature) and quantum (cryogenic) regime. In this work, we investigate a YIG sphere coupled strongly to a microwave cavity over the full temperature range from $290\,\mathrm{K}$ down to $30\,\mathrm{mK}$. The cavity-magnon polaritons are studied from the classical to the quantum regime where the thermal energy is less than one resonant microwave quanta, i.e. at temperatures below $1\,\mathrm{K}$. We compare the temperature dependence of the coupling strength $g_{\rm{eff}}(T)$, describing the strength of coherent energy exchange between spin ensemble and cavity photon, to the temperature behavior of the saturation magnetization evolution $M_{\rm{s}}(T)$ and find strong deviations at low temperatures. The temperature dependence of magnonic disspation is governed at intermediate temperatures by rare earth impurity scattering leading to a strong peak at $40\,$K. The linewidth $κ_{\rm{m}}$ decreases to $1.2\,$MHz at $30\,$mK, making this system suitable as a building block for quantum electrodynamics experiments. We achieve an electromagnonic cooperativity in excess of $20$ over the entire temperature range, with values beyond $100$ in the milliKelvin regime as well as at room temperature. With our measurements, spectroscopy on strongly coupled magnon-photon systems is demonstrated as versatile tool for spin material studies over large temperature ranges. Key parameters are provided in a single measurement, thus simplifying investigations significantly.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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