Quantum-Confined Electronic States Arising from the Moire Pattern of MoS2-WSe2 Heterobilayers

被引:97
作者
Pan, Yi [1 ,2 ]
Foelsch, Stefan [1 ]
Nie, Yifan [3 ]
Waters, Dacen [4 ]
Lin, Yu-Chuan [5 ,6 ]
Jariwala, Bhakti [5 ,6 ]
Zhang, Kehao [5 ,6 ]
Cho, Kyeongjae [3 ]
Robinson, Joshua A. [5 ,6 ]
Feenstra, Randall M. [4 ]
机构
[1] Paul Drude Inst Festkorperelekt, Hausvogteipl 5-7, D-10117 Berlin, Germany
[2] Xi An Jiao Tong Univ, Ctr Spintron & Quantum Syst, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
[3] Univ Texas Dallas, Dept Mat Sci & Engn, Dallas, TX 75080 USA
[4] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
[5] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
[6] Penn State Univ, Ctr Dimens & Layered Mat 2, University Pk, PA 16802 USA
基金
美国国家科学基金会;
关键词
2D materials; heterostructures; transition metal dichalcogenides; scanning tunneling microscopy; scanning tunneling spectroscopy; SCANNING-TUNNELING-MICROSCOPY; HETEROSTRUCTURES; GRAPHENE; SURFACE; MOS2;
D O I
10.1021/acs.nanolett.7b05125
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A two-dimensional (2D) heterobilayer system consisting of MoS2 on WSe2, deposited on epitaxial graphene, is studied by scanning tunneling microscopy and spectroscopy at temperatures of 5 and 80 K. A moire pattern is observed, arising from lattice mismatch of 3.7% between the MoS2 and WSe2. Significant energy shifts are observed in tunneling spectra observed at the maxima of the moire corrugation, as compared with spectra obtained at corrugation minima, consistent with prior work. Furthermore, at the minima of the moire corrugation, sharp peaks in the spectra at energies near the band edges are observed for spectra acquired at 5 K The peaks correspond to discrete states that are confined within the moire unit cells. Conductance mapping is employed to reveal the detailed structure of the wave functions of the states. For measurements at 80 K, the sharp peaks in the spectra are absent, and conductance maps of the band edges reveal little structure.
引用
收藏
页码:1849 / 1855
页数:7
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