期刊
NANO LETTERS
卷 22, 期 15, 页码 6215-6222出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c01710
关键词
twisted trilayer graphene; double-moire superlattice; conductive AFM; symmetry breaking; anomalous conductivity
类别
资金
- National Key Research and Development Program of China [2021YFA1401300, 2021YFA0715600]
- Leading Talents Program of Guangdong Province [2016LJ06C372]
- Guangdong Provincial Key Laboratory Program from the Department of Science and Technology of Guangdong Province [2021B1212040001]
- National Natural Science Foundation of China [11772153, 12072150, 11872203, 12102180]
- NSF of Jiangsu Province [BK20190018]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- National Natural Science Foundation of China for Creative Research Groups [51921003]
- Elemental Strategy Initiative conducted by the MEXT of Japan [JPMXP0112101001]
- Joint Fund of Advanced Aerospace Manufacturing Technology Research
- JSPS KAKENHI [U1937601]
- JSPS [19H05790, 20H00354, 21H05233]
In this study, a twisted trilayer graphene double-moire superlattice was investigated using conductive atomic force microscopy. Two sets of moire superlattices were observed, and different rotational symmetries of current as well as anomalous current at the A-A stacking site were discovered. These behaviors can be understood through atomic reconstruction.
In a two-dimensional moire superlattice, the atomic reconstruction of constituent layers could introduce significant modifications to the lattice symmetry and electronic structure at small twist angles. Here, we employ conductive atomic force microscopy to investigate a twisted trilayer graphene double-moire superlattice. Two sets of moire superlattices are observed. At neighboring domains of the large moire, the current exhibits either 2- or 6-fold rotational symmetry, indicating delicate symmetry breaking beyond the rigid model. Moreover, an anomalous current appears at the A-A stacking site of the larger moire contradictory to previous observations on twisted bilayer graphene. Both behaviors can be understood by atomic reconstruction, and we also show that the measured current is dominated by the tip-graphene contact resistance that maps the local work function qualitatively. Our results reveal new insights of atomic reconstruction in novel moire superlattices and opportunities for manipulating exotic quantum states on the basis of twisted van der Waals heterostructures.
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