Stacking Order Dependent Second Harmonic Generation and Topological Defects in h-BN Bilayers

被引:149
作者
Kim, Cheol-Joo [1 ]
Brown, Lola [1 ]
Graham, Matt W. [2 ,3 ]
Hovden, Robert [4 ]
Havener, Robin W. [4 ]
McEuen, Paul L. [2 ,3 ]
Muller, David A. [3 ,4 ]
Park, Jiwoong [1 ,3 ]
机构
[1] Cornell Univ, Dept Chem & Biol Chem, Ithaca, NY 14853 USA
[2] Cornell Univ, Atom & Solid State Phys Lab, Ithaca, NY 14853 USA
[3] Cornell Univ, Kavli Inst Cornell Nanoscale Sci, Ithaca, NY 14853 USA
[4] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA
基金
美国国家科学基金会; 新加坡国家研究基金会;
关键词
Hexagonal boron nitride; second harmonic generation; topological defect; stacking order; inversion symmetry; energy landscape; HEXAGONAL BORON-NITRIDE; BAND-GAP; MONOLAYER; TRANSPORT;
D O I
10.1021/nl403328s
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The ability to control the stacking structure in layered materials could provide an exciting approach to tuning their optical and electronic properties. Because of the lower symmetry of each constituent monolayer, hexagonal boron nitride (h-BN) allows more structural variations in multiple layers than graphene; however, the structure property relationships in this system remain largely unexplored. Here, we report a strong correlation between the interlayer stacking structures and optical and topological properties in chemically grown h-BN bilayers, measured mainly by using dark-field transmission electron microscopy (DF-TEM) and optical second harmonic generation (SHG) mapping. Our data show that there exist two distinct h-BN bilayer structures with different interlayer symmetries that give rise to a distinct difference in their SHG intensities. In particular, the SHG signal in h-BN bilayers is observed only for structures with broken inversion symmetry, with an intensity much larger than that of single layer h-BN. In addition, our DF-TEM data identify the formation of interlayer topological defects in h-BN bilayers, likely induced by local strain, whose properties are determined by the interlayer symmetry and the different interlayer potential landscapes.
引用
收藏
页码:5660 / 5665
页数:6
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