Kim Hyo Sung, Gye Gyeongcheol, Lee Sung-Hoon, Wang Lihai, Cheong Sang-Wook, Yeom Han Woong
Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang, 790-784, Korea.
Department of Physics, Pohang University of Science and Technology, Pohang, 790-784, Korea.
Sci Rep. 2017 Oct 6;7(1):12735. doi: 10.1038/s41598-017-12851-0.
We investigate using scanning tunneling microscopy and spectroscopy electronic aspects of Moiré superstructures in nanoscale Pb quantum films grown on IrTe, which is a unique layered material with charge-order transitions into stripe phases. Pb ultrathin films exhibit a Moiré superstructure due to the lattice mismatch of Pb and IrTe, which produces strong lateral electronic modulation of hexagonal symmetry and discreet subbands. Moreover, strongly anisotropic or 1D electronic states are formed in Pb films as modulated by the stripe charge order. Present results indicate the controllability of lateral electronic structures of various ultrathin films by extra interfacial potentials due not only to Moiré superstructures but also to novel electronic orderings of substrates.
我们利用扫描隧道显微镜和光谱学研究了生长在IrTe上的纳米级Pb量子薄膜中莫尔超结构的电子特性，IrTe是一种独特的层状材料，具有电荷序转变为条纹相的特性。由于Pb和IrTe的晶格失配，Pb超薄膜呈现出莫尔超结构，这种结构产生了具有六边形对称性和离散子带的强横向电子调制。此外，在条纹电荷序的调制下，Pb薄膜中形成了强各向异性或一维电子态。目前的结果表明，由于莫尔超结构以及衬底的新型电子有序性，额外的界面势可实现对各种超薄膜横向电子结构的可控性。
