核磁共振在高达10.1千兆帕斯卡的压力下检测铝金属中的电子拓扑跃迁
Nuclear magnetic resonance at up to 10.1 Giga-Pascal pressure detects an electronic topological transition in aluminum metal
摘要：
高灵敏度$^{27}$铝核磁共振（NMR）测量的铝金属的静水压力下高达10.1 GPa揭示了一个意想不到的负曲率的电子态密度的压力依赖性测量通过移位和弛豫，这违反了自由电子的行为。对铝的费米学的仔细分析表明，压力引起了电子拓扑跃迁（Lifshitz跃迁），这是测量到的态密度变化的原因。实验还揭示了四极相互作用导致的4.2GPa以上的NMR线宽的突然增加，这与金属的立方对称性不一致。
英文摘要：
High-sensitivity $^{27}$Al nuclear magnetic resonance (NMR) measurements of aluminum metal under hydrostatic pressure of up to 10.1 GPa reveal an unexpected negative curvature in the pressure-dependence of the electronic density of states measured through shift and relaxation, which violates free electron behavior. A careful analysis of the Fermiology of aluminum shows that pressure induces an electronic topological transition (Lifshitz transition) that is responsible for the measured change in the density of states. The experiments also reveal a sudden increase in the NMR linewidth above 4.2 GPa from quadrupole interaction, which is not in agreement with the metal's cubic symmetry.
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