Switching between one and two dimensions: conductivity of Pb-induced chain structures on Si(557).
Switching between one and two dimensions: conductivity of Pb-induced chain structures on Si(557).
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一维和二维之间的切换：Si(557) 上 Pb 诱导的链结构的电导率。
DOI：
10.1103/physrevlett.95.176804
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发表时间：
2005
影响因子：
8.6
通讯作者：
M. Henzler
中科院分区：
文献类型：
--
作者：
C. Tegenkamp;Z. Kallassy;H. Pfnür;H. Günter;V. Zielasek;M. Henzler
我们在四点电导测量和隧道显微镜的联合研究中表明，单层铅在Si（557）上引起的表面态电导可以是准一维的，电导率值接近典型的三维金属。在临界温度Tc = 78 K时，伴随着有序-无序相变和沿Pb链的十倍超周期性，体系从低电导各向异性切换到高电导各向异性，在垂直于链结构的方向上发生半导体-绝缘体转变，而沿链的电导与温度（1/T + const）相关。
We show in a combined study of four-point conductance measurement and tunneling microscopy that surface state conductance induced by one monolayer of Pb on Si(557) can be quasi one dimensional with conductivity values close to typical three-dimensional metals. At a critical temperature of Tc = 78 K, associated with an order-disorder phase transition and a tenfold superperiodicity along the Pb chains, the system switches from low to high conductance anisotropy, with a semiconductor-insulator transition in the direction perpendicular to the chain structure, while along the chains conductance with a (1/T + const) temperature dependence was found.