Particle-hole asymmetric lifetimes promoted by spin and orbital fluctuations in SrVO$_3$ monolayers
Particle-hole asymmetric lifetimes promoted by spin and orbital fluctuations in SrVO$_3$ monolayers
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SrVO$_3$单层中自旋和轨道涨落促进的粒子孔不对称寿命
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
K. Held
中科院分区：
文献类型：
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作者：
Matthias Pickem;J. Tomczak;K. Held
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SrVO3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 = kF“）被认为会导致赝能隙物理。在这里，在多轨道的情况下，我们证明了费米表面的被占据侧（“k < kF“）和未被占据侧（“k > kF“）的动量之间的差异。我们的工作，基于动力学顶点近似，补充了非局部波动的光谱特征的理解，呼吁（重新）检查其他超薄氧化物薄膜和界面的方法超越动力学平均场理论，并可能指向相关增强热电效应。
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 SrVO3 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 = kF ”) is known to lead to pseudogap physics. Here instead, in the multi-orbital case, we evidence a differentiation between momenta on the occupied (”k < kF ”) and the unoccupied side (”k > kF ”) 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.