Si(111)上Pb吸附原子单层中依赖于掺杂的电荷与自旋密度波有序
Doping-dependent charge- and spin-density wave orderings in a monolayer of Pb adatoms on Si(111)
AI总结：
本文通过多体计算研究了Si(111):Pb体系随温度和掺杂变化的相图，发现电荷与自旋密度波有序在多个区域共存，且其几何结构强烈依赖掺杂水平，揭示了晶格畸变与电子关联的共同作用机制。
摘要：
在这项工作中，我们计算了周期性排布在硅(111)表面上的铅吸附原子系统随温度和掺杂变化的相图。这种Si(111):Pb材料的特点是具有强而长程的库仑相互作用、相对较大的自旋轨道耦合值，以及在低温下发生的结构相变。为了描述该系统中的集体电子行为，我们进行了多体计算，并一致地考虑了所有这些重要特征。我们发现，在相图的若干区域中，电荷密度波和自旋密度波有序彼此共存。这一结果与该材料中最近实验观测到的电荷密度波相中的手性自旋织构一致。我们还发现，电荷和自旋织构的几何形状强烈依赖于掺杂水平。Si(111):Pb材料中如此丰富相图的形成可以通过晶格畸变和电子关联的共同作用来解释。
英文摘要：
In this work we computed the phase diagram as a function of temperature and doping for a system of lead adatoms allocated periodically on a silicon (111) surface. This Si(111):Pb material is characterized by a strong and long-ranged Coulomb interaction, a relatively large value of the spin-orbit coupling, and a structural phase transition that occurs at low temperature. In order to describe the collective electronic behavior in the system, we perform many-body calculations consistently taking all these important features into account. We find that charge- and spin-density wave orderings coexist with each other in several regions of the phase diagram. This result is in agreement with the recent experimental observation of a chiral spin texture in the charge density wave phase in this material. We also find that geometries of the charge and spin textures strongly depend on the doping level. The formation of such a rich phase diagram in the Si(111):Pb material can be explained by a combined effect of the lattice distortion and electronic correlations.
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