论文标题
（111）ktao $ _3 $的条纹电子液体
A Striped Electron Fluid on (111) KTaO$_3$
论文作者
论文摘要
最近的一项研究表明，在EUO的界面和（111）KTAO $ _3 $诱导的低载体密度电子气体（2DEG）表现出一个破碎的对称阶段，其电阻率的平面内各向异性强。我们提出了该（111）2DEG的最小紧密结合模型，包括来自TA离子的大型自旋轨道耦合，该耦合揭示了具有高度增强的2 $ K_F $电子易感性的六边形费米表面。我们认为，排斥电子相互作用以及铁磁EUO底物有利于磁条带的不稳定性，导致部分盖布的费米表面。这样的条纹状态或其残留nematicity可以解释观察到的转运各向异性。我们提出了一个低能$ j = 3/2 $状态的$ K \ CDOT P $理论，该状态捕获了我们的紧密结合研究的关键结果，并进一步揭示了该磁条纹顺序下的互联偶极和八度调制。我们通过猜测这种条纹顺序与该材料中的超导性的关系来结束。
A recent study has revealed that the low carrier density electron gas (2DEG) induced at the interface of EuO and (111) KTaO$_3$ exhibits a broken symmetry phase with a strong in-plane anisotropy of the resistivity. We present a minimal tight binding model of this (111) 2DEG, including the large spin-orbit coupling from the Ta ions, which reveals a hexagonal Fermi surface with a highly enhanced 2$k_F$ electronic susceptibility. We argue that repulsive electronic interactions, together with a ferromagnetic EuO substrate, favor a magnetic stripe instability leading to a partially gapped Fermi surface. Such a stripe state, or its vestigial nematicity, could explain the observed transport anisotropy. We propose a $k\cdot p$ theory for the low energy $j=3/2$ states, which captures the key results from our tight-binding study, and further reveals the intertwined dipolar and octupolar modulations underlying this magnetic stripe order. We conclude by speculating on the relation of this stripe order to the superconductivity seen in this material.
