自旋冰中磁单极的布朗运动和量子动力学
Brownian Motion and Quantum Dynamics of Magnetic Monopoles in Spin Ice
摘要：
自旋冰展示了许多不寻常的磁性，包括零点熵，涌现的单极子和准液体-气体转变。揭示支撑这些现象的量子自旋动力学是一个实验挑战。在这里，我们展示了如何至关重要的信息包含在磁化率的频率依赖性，并在其高频率或绝热极限。这些措施表明，电子自旋扩散是严格的布朗，但支撑的自旋隧道效应，并受到集体电子自旋相互作用。我们还发现了在弱场作用下驱动等离子体振荡的证据，以及在强场作用下非常规的临界行为。我们的研究结果解决了目前对自旋冰的理解中的矛盾，揭示了意想不到的物理现象，并建立了绝热磁化率作为奇异自旋系统的揭示特征。
英文摘要：
Spin ice illustrates many unusual magnetic properties, including zero point entropy, emergent monopoles and a quasi liquid-gas transition. To reveal the quantum spin dynamics that underpin these phenomena is an experimental challenge. Here we show how crucial information is contained in the frequency dependence of the magnetic susceptibility and in its high frequency or adiabatic limit. These measures indicate that monopole diffusion is strictly Brownian but is underpinned by spin tunnelling and is influenced by collective monopole interactions. We also find evidence of driven monopole plasma oscillations in weak applied field, and unconventional critical behaviour in strong applied field. Our results resolve contradictions in the present understanding of spin ice, reveal unexpected physics and establish adiabatic susceptibility as a revealing characteristic of exotic spin systems.
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