论文标题
通过碱掺杂，揭示了铁电$α$ gete（111）的巨型Rashba裂面状态的完整分散
Unveiling the complete dispersion of the giant Rashba split surface states of ferroelectric $α$-GeTe(111) by alkali doping
论文作者
论文摘要
$α$ -GETE（111）是一种非中心的铁电材料，为此，强的自旋轨道相互作用会导致巨大的Rashba分裂状态在整体和表面。散装带隙内的表面状态的详细分散仍然是一个空旷的问题，因为它们位于电子结构的空位中，使它们无法无法访问静态角度分辨的光发射光谱。我们表明，可以通过表面的原位钾掺杂来克服这一困难，从而导致80 MeV的表面状态向占领状态进行刚性移动。因此，我们详细介绍了它们的分散体，并在$ \barγ$点上突出了它们的穿越，与密度功能理论计算相比，该点确定了Rashba机制。
$α$-GeTe(111) is a non-centrosymmetric ferroelectric material, for which a strong spin-orbit interaction gives rise to giant Rashba split states in the bulk and at the surface. The detailed dispersions of the surface states inside the bulk band gap remains an open question because they are located in the unoccupied part of the electronic structure, making them inaccessible to static angle-resolved photoemission spectroscopy. We show that this difficulty can be overcome via in-situ potassium doping of the surface, leading to a rigid shift of 80 meV of the surface states into the occupied states. Thus, we resolve in great detail their dispersion and highlight their crossing at the $\barΓ$ point, which, in comparison with density functional theory calculations, definitively confirms the Rashba mechanism.
