arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1504.01971cond-mat.mtrl-scicond-mat.mes-hall
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金表面的拓扑态

Topological States on the Gold Surface

Binghai Yan, Benjamin Stadtmüller, Norman Haag, Sebastian Jakobs, Johannes Seidel, Dominik Jungkenn, Stefan Mathias, Mirko Cinchetti, Martin Aeschlimann, Claudia Felser

摘要:

金表面拥有特殊的电子态,被认为是肖克利表面态(SS)的原型。这些SS通常用于对角分辨光电子能谱(ARPES)和扫描隧道光谱的能力进行基准测试。我们发现这些Shockley表面态可以被重新解释为最近发现的量子态--拓扑绝缘体的拓扑导出表面态。基于能带结构计算,可以很好地定义Z2拓扑不变量来表征我们通过ARPES检测到的金的非平凡特征。相同的TDSS也在其他众所周知的贵金属(例如,银、铜、铂和钯)。除了提供了一个新的理解贵金属SS,发现后过渡金属的拓扑状态引发了有趣的问题,拓扑效应的作用,在表面相关的过程,如吸附和催化。

英文摘要:

Gold surfaces host special electronic states that have been understood as a prototype of Shockley surface states (SSs). These SSs are commonly employed to benchmark the capability of angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling spectroscopy. We find that these Shockley SSs can be reinterpreted as topologically derived surface states (TDSSs) of a topological insulator (TI), a recently discovered quantum state. Based on band structure calculations, the Z2 topological invariant can be well defined to characterize the nontrivial features of gold that we detect by ARPES. The same TDSSs are also recognized on surfaces of other well-known noble metals (e.g., silver, copper, platinum, and palladium). Besides providing a new understanding of noble metal SSs, finding topological states on late transition metals provokes interesting questions on the role of topological effects in surface-related processes, such as adsorption and catalysis.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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