Journal
NANO RESEARCH
Volume 13, Issue 2, Pages 353-357Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2613-3
Keywords
transition metal dichalcogenides; Cu-intercalation; band shift; angle resolved photoemission spectroscopy
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Funding
- National Key R&D Program of China [2017YFA0402901, 2016YFA0401004]
- National Natural Science Foundation of China [11674296, 21727801, 11621063]
- Key Research Program of the Chinese Academy of Sciences [XDPB01]
- Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology [2018CXFX002]
- NSFC-MAECI [51861135202]
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The intercalation of metal is a promising method for the modulating electronic properties in transition metal dichalcogenides (TMDs). However, there still lacks enough knowledge about how the intercalated atoms directly impact the two-dimensional structural layers and modulate the band structures therein. Taking advantage of X-ray absorption fine structure and angle-resolved photoemission spectroscopy, we studied how Cu intercalation influences the host TaSe2 layers in Cu0.03TaSe2 crystals. The intercalated Cu atoms form bonds with Se of the host layers, and there is charge transfer from Cu to Se. By examining the changes of band dispersions, we show that the variation of electronic structures is beyond a simple rigid band model with merely charge doping effect. This work reveals that the unusual change of band dispersions is associated with the formation of bonds between the intercalated metal elements and anion ions in the host layers, and provides a reference for the comprehensive understanding of the electronic structures in intercalated materials.
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