SrVO $_3$单分子膜中自旋和轨道涨落对粒子-空穴非对称寿命的影响
Particle-hole asymmetric lifetimes promoted by spin and orbital fluctuations in SrVO$_3$ monolayers
摘要：
工程过渡金属超薄氧化物薄膜的二维性质提供了一个尚未完全理解的物理学的大操场。在这里，我们研究原始SrVO $_3$单层，最近被预测显示各种磁性和轨道顺序。以上所有的有序温度，我们发现，相关的非局部波动导致动量分化的自能，特别是在散射率。在单能带2D哈伯德模型中，费米表面上的动量选择性（“$k=k_F$“）已知会导致赝能隙物理。这里，在多轨道的情况下，我们证明了费米面被占据一侧（“$k<k_F$“）和未被占据一侧（“$k>k_F$“）的动量之间的差别。我们的工作，基于动态顶点近似，补充了理解的光谱特征的非本地波动，呼吁（重新）检查其他超薄氧化膜和接口的方法超越动态平均场论，并可能指向相关增强热电效应。
英文摘要：
The two-dimensional nature of engineered transition-metal ultra-thin oxide films offers a large playground of yet to be fully understood physics. Here, we study pristine SrVO$_3$ monolayers that have recently been predicted to display a variety of magnetic and orbital orders. Above all ordering temperatures, we find that the associated non-local fluctuations lead to a momentum differentiation in the self-energy, particularly in the scattering rate. In the one-band 2D Hubbard model, momentum-selectivity on the Fermi surface ("$k=k_F$") is known to lead to pseudogap physics. Here instead, in the multi-orbital case, we evidence a differentiation between momenta on the occupied ("$k<k_F$") and the unoccupied side ("$k>k_F$") of the Fermi surface. Our work, based on the dynamical vertex approximation, complements the understanding of spectral signatures of non-local fluctuations, calls to (re)examine other ultra-thin oxide films and interfaces with methods beyond dynamical mean-field theory, and may point to correlation-enhanced thermoelectric effects.
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