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Special Issue:
SPECIAL TOPIC — Valleytronics
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Valley-dependent transport in a mescoscopic twisted bilayer graphene device |
| Wen-Xuan Shi(史文萱), Han-Lin Liu(刘翰林)†, and Jun Wang(汪军) |
| School of Physics, Southeast University, Nanjing 210096, China |
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Abstract We study the valley-dependent electron transport in a four-terminal mesoscopic device of the two monolayer graphene nanoribbons vertically stacked together, where the intersection forms a bilayer graphene lattice with a controllable twist angle. Using a tight-binding lattice model, we show that the longitudinal and transverse conductances exhibit significant valley polarization in the low energy regime for small twist angles. As the twist angle increases, the valley polarization shifts to the high energy regime. This arises from the regrouping effect of the electron band in the twisted bilayer graphene region. But for relatively large twist angles, no significant valley polarization is observed. These results are consistent with the spectral densities of the twisted bilayer graphene.
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Received: 27 June 2023
Revised: 10 September 2023
Accepted manuscript online: 15 September 2023
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PACS:
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72.80.Vp
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(Electronic transport in graphene)
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72.10.-d
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(Theory of electronic transport; scattering mechanisms)
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71.70.Fk
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(Strain-induced splitting)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12174051 and 11874221). |
Corresponding Authors:
Han-Lin Liu
E-mail: 230228533@seu.edu.cn
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Cite this article:
Wen-Xuan Shi(史文萱), Han-Lin Liu(刘翰林), and Jun Wang(汪军) Valley-dependent transport in a mescoscopic twisted bilayer graphene device 2024 Chin. Phys. B 33 017205
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