Atomically controlled quantum chains hosting a Tomonaga-Luttinger liquid
Atomically controlled quantum chains hosting a Tomonaga-Luttinger liquid
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DOI：
10.1038/nphys2051
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发表时间：
2011-10-01
期刊：
影响因子：
19.6
通讯作者：
Claessen, R.
中科院分区：
文献类型：
--
作者：
Blumenstein, C.;Schaefer, J.;Claessen, R.
表面上的原子组件代表了电子电路的最低尺寸极限，它们的传导特性受量子现象的支配。关于将电子限制在一维空间的原子线的一个基本预测是Tomonaga-Luttinger液体。然而，令人惊讶的是，到目前为止还没有在地表系统中观察到这一点。在这里，我们通过扫描隧道光谱和光电发射来仔细研究单原子宽度的自组织链。低能谱惟一地表现幂律行为。更重要的是，态的密度服从能量和温度的普遍标度。这证明了典型的Tomonaga-Luttinger液体特性（2,3）在原子尺度上遇到，与导线和结的导电性有关。局部控制使我们能够研究由于缺陷或桥接原子而改变的相互作用，这在以前是不可能的。
Atom assemblies on surfaces represent the ultimate lower size limit for electronic circuits, and their conduction properties are governed by quantum phenomena. A fundamental prediction for a line of atoms confining the electrons to one dimension is the Tomonaga-Luttinger liquid(1). Yet, astonishingly, this has not been observed in surface systems so far. Here we scrutinize self-organized chains of single-atom width by scanning tunnelling spectroscopy and photoemission. The low-energy spectra univocally show power-law behaviour. Even more, the density of states obeys universal scaling with energy and temperature. This demonstrates paradigmatic Tomonaga-Luttinger liquid properties(2,3) encountered at the atomic scale, with bearing for the conductivity of wires and junctions. Local control enables us to study modified interactions due to defects or bridging atoms not previously possible.