Large-area, periodic, and tunable intrinsic pseudo-magnetic fields in low-angle twisted bilayer graphene
| Autor: | Kaixiang Huang, Shengyong Qin, Haohao Shi, Mikhail I. Katsnelson, Pengju Li, Shengjun Yuan, Zhen Zhan, Runxiao Zhang, Hengxing Ji, Zhikai Qi, Kun Xie, Zhenyu Zhang, Edo van Veen, José Ángel Silva-Guillén |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Electronic properties and materials
Science Theory of Condensed Matter General Physics and Astronomy FOS: Physical sciences 02 engineering and technology 01 natural sciences General Biochemistry Genetics and Molecular Biology Article law.invention Condensed Matter - Strongly Correlated Electrons law Magnetic properties and materials 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 010306 general physics Spectroscopy lcsh:Science Quantum Physics Multidisciplinary Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Mesoscale and Nanoscale Physics Bilayer General Chemistry 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Magnetic field Vortex Amplitude lcsh:Q Scanning tunneling microscope 0210 nano-technology Bilayer graphene |
| Zdroj: | Nature Communications Nature Communications, 11 Nature Communications, 11, 1 Nature Communications, Vol 11, Iss 1, Pp 1-7 (2020) |
| ISSN: | 2041-1723 |
| Popis: | A properly strained graphene monolayer or bilayer is expected to harbour periodic pseudo-magnetic fields with high symmetry, yet to date, a convincing demonstration of such pseudo-magnetic fields has been lacking, especially for bilayer graphene. Here, we report the first definitive experimental proof for the existence of large-area, periodic pseudo-magnetic fields, as manifested by vortex lattices in commensurability with the moir\'e patterns of low-angle twisted bilayer graphene. The pseudo-magnetic fields are strong enough to confine the massive Dirac electrons into circularly localized pseudo-Landau levels, as observed by scanning tunneling microscopy/spectroscopy, and also corroborated by tight-binding calculations. We further demonstrate that the geometry, amplitude, and periodicity of the pseudo-magnetic field can be fine-tuned by both the rotation angle and heterostrain applied to the system. Collectively, the present study substantially enriches twisted bilayer graphene as a powerful enabling platform for exploration of new and exotic physical phenomena, including quantum valley Hall effects and quantum anomalous Hall effects. Comment: 7 pages, 4 figures |
| Databáze: | OpenAIRE |
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