Valley-dependent transport in a mescoscopic twisted bilayer graphene device

doi:10.1088/1674-1056/acf9e4

中国物理B ›› 2024, Vol. 33 ›› Issue (1): 17205-17205.doi: 10.1088/1674-1056/acf9e4

所属专题： SPECIAL TOPIC — Valleytronics

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

收稿日期:2023-06-27 修回日期:2023-09-10 接受日期:2023-09-15 出版日期:2023-12-13 发布日期:2024-01-03
通讯作者: Han-Lin Liu E-mail:230228533@seu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12174051 and 11874221).

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

Received:2023-06-27 Revised:2023-09-10 Accepted:2023-09-15 Online:2023-12-13 Published:2024-01-03
Contact: Han-Lin Liu E-mail:230228533@seu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12174051 and 11874221).

摘要/Abstract

摘要： 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.

关键词: twisted bilayer graphene, valley-dependent transport, graphene nanoribbon, conductance

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.

Key words: twisted bilayer graphene, valley-dependent transport, graphene nanoribbon, conductance

中图分类号: (Electronic transport in graphene)

72.80.Vp

72.10.-d (Theory of electronic transport; scattering mechanisms) 71.70.Fk (Strain-induced splitting)

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[J]. 中国物理B, 2024, 33(1): 17205-17205.

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[J]. Chin. Phys. B, 2024, 33(1): 17205-17205.

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Valley-dependent transport in a mescoscopic twisted bilayer graphene device

Valley-dependent transport in a mescoscopic twisted bilayer graphene device

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