哈伯德模型中电子向列性增强的趋势及其与高温超导体Raman散射的比较
Tendencies of enhanced electronic nematicity in the Hubbard model and a comparison with Raman scattering on high-temperature superconductors
摘要：
铜氧化物高温超导体的赝能隙区具有多种竞争有序的特征，其性质仍有广泛的争论。最近的实验提供了电子流体有序的证据，其中电子流体打破了旋转对称性，同时保持平移不变性。拉曼光谱具有对称分辨低能激发的能力，是一种独特的工具，可用于评估电子涨落和电子有序化趋势。在这里，我们比较结果从决定性的量子蒙特卡罗模拟的哈伯德模型的实验结果从拉曼光谱在$\text{La}_{2-x}\text{Sr}_{x}\text{CuO}_{4}$，这表明一个显着的增加，在$B_{1g}$响应约10%的空穴掺杂的温度降低，表明在低能量的波动上升。我们的研究结果支持一个图片中发生在欠掺杂的铜酸盐，这可能会产生在高温下熔融条纹的$B_{1g}$对称性的波动。
英文摘要：
The pseudogap regime of the cuprate high-temperature superconductors is characterized by a variety of competing orders, the nature of which are still widely debated. Recent experiments have provided evidence for electron nematic order, in which the electron fluid breaks rotational symmetry while preserving translational invariance. Raman spectroscopy, with its ability to symmetry resolve low energy excitations, is a unique tool that can be used to assess nematic fluctuations and nematic ordering tendencies. Here, we compare results from determinant quantum Monte Carlo simulations of the Hubbard model to experimental results from Raman spectroscopy in $\text{La}_{2-x}\text{Sr}_{x}\text{CuO}_{4}$, which show a prominent increase in the $B_{1g}$ response around 10% hole doping as the temperature decreases, indicative of a rise in nematic fluctuations at low energy. Our results support a picture of nematic fluctuations with $B_{1g}$ symmetry occurring in underdoped cuprates, which may arise from melted stripes at elevated temperatures.
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