期刊
CHINESE PHYSICS LETTERS
卷 38, 期 9, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0256-307X/38/9/097101
关键词
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资金
- National Key Research and Development Program of China [2020YFA0308800, 2016YFA0202300]
- National Natural Science Foundation of China [11974045, 61888102]
- Chinese Academy of Sciences [XDB30000000]
- Beijing Institute of Technology Research Fund Program for Young Scholars [3050011181909]
- China Postdoctoral Science Foundation [2018M641511]
- U.S. DOE-BES [DE-FG0204ER46148]
Researchers have developed a theoretical mechanism for manipulating Dirac fermions in graphene by nanopatterning, changing the Dirac cone shape and tilt by selectively chemically absorbing the material. By altering the inter-AC coupling strength with different adsorption species, such as halogen vs hydrogen, the shape and tilt of the Dirac cone can be modified. Investigating the topological edge states and transport properties reveals the potential for designing nanostructures with novel functionality.
Graphene has afforded an ideal 2D platform for investigating a rich and fascinating behavior of Dirac fermions. Here, we develop a theoretical mechanism for manipulating the Dirac fermions in graphene, such as from type-I to type-II and type-III, by a top-down nanopatterning approach. We demonstrate that by selective chemical adsorption to pattern the 2D graphene into coupled 1D armchair chains (ACs), the intrinsic isotropic upright Dirac cone becomes anisotropic and strongly tilted. Based on model analyses and first-principles calculations, we show that both the shape and tilt of Dirac cone can be tuned by the species of chemisorption, e.g., halogen vs hydrogen, which modifies the strength of inter-AC coupling. Furthermore, the topological edge states and transport properties of the engineered Dirac fermions are investigated. Our work sheds lights on understanding the Dirac fermions in a nanopatterned graphene platform, and provides guidance for designing nanostructures with novel functionality.
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