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arXiv 2204.06296cond-mat.mtrl-scicond-mat.mes-hall
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邻位硅表面硅原子链的Z3电荷密度波

Z3 Charge Density Wave of Silicon Atomic Chains on a Vicinal Silicon Surface

Euihwan Do, Jae Whan Park, Oleksandr Stetsovych, Pavel Jelinek, Han Woong Yeom

摘要:

在Au修饰的邻位硅表面上,沿原子链形成了理想的一维电子系统,但其低温相的性质在过去的二十年里一直是个谜。在这里,我们毫不含糊地确定使用高分辨率原子力显微镜和扫描隧道显微镜的低温结构变形的表面。这个表面的最重要的结构成分,台阶边缘硅链被发现是强烈的屈曲,每三个原子下来,形成三聚体晶胞。这一观察结果与最近的重新杂交悬挂键模型一致,并排除了之前提出的反铁磁自旋有序。的光谱和电子结构计算表明一个电荷密度波绝缘体与Z3拓扑结构,使其有可能利用拓扑相位和激发。Tunneling电流被发现大大降低了三个简并CDW态之间的能量势垒,这在很低的温度下诱导动态波动的CDW。

英文摘要:

An ideal one-dimensional electronic system is formed along atomic chains on Au-decorated vicinal silicon surfaces but the nature of its low temperature phases has been puzzled for last two decades. Here, we unambiguously identify the low temperature structural distortion of this surface using high resolution atomic force microscopy and scanning tunneling microscopy. The most important structural ingredient of this surface, the step-edge Si chains are found to be strongly buckled, every third atoms down, forming trimer unitcells. This observation is consistent with the recent model of rehybridized dangling bonds and rules out the antiferromagnetic spin ordering proposed earlier. The spectroscopy and electronic structure calculation indicate a charge density wave insulator with a Z3 topology making it possible to exploit topological phases and excitations. Tunneling current was found to substantially lower the energy barrier between three degenerate CDW states, which induces a dynamically fluctuating CDW at very low temperature.

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