期刊
PHYSICAL REVIEW B
卷 87, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.205405
关键词
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资金
- National Key Basic Research Program of China [2013CBA01603]
- National Natural Science Foundation of China [11004010, 10974019, 21073003, 51172029, 91121012]
- Fundamental Research Funds for the Central Universities
- Ministry of Science, and Technology of China [2011CB921903, 2012CB921404]
Theoretical research has predicted that a ripple of graphene generates an effective gauge field on its low-energy electronic structure and could lead to Landau quantization. Here, we demonstrate using a combination of an experimental method (scanning tunneling microscopy) and a theoretical approach (tight-binding approximation) that Landau levels will form when the effective pseudomagnetic flux per ripple Phi similar to (h(2)/la)Phi(0) is larger than the flux quantum Phi(0) (here, h is the height, l is the width of the ripple, and a is the nearest C-C bond length). The strain-induced gauge field in the ripple only results in one-dimensional (1D) Landau-level quantization along the ripple. Such 1D Landau quantization does not exist in two-dimensional systems in an external magnetic field. Its existence offers a unique opportunity to realize interesting electronic properties in strained graphene.
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