Formation of topological domain walls and quantum transport properties of zero-line modes in commensurate bilayer graphene systems

doi:10.1007/s11467-022-1185-y

Frontiers of Physics

2022, Vol. 17

Issue (6): 63503 https://doi.org/10.1007/s11467-022-1185-y

本期目录

Formation of topological domain walls and quantum transport properties of zero-line modes in commensurate bilayer graphene systems

Junjie Zeng¹, Rui Xue¹, Tao Hou¹, Yulei Han^1,², Zhenhua Qiao¹(

)

¹. ICQD, Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei 230026, China
². Department of Physics, Fuzhou University, Fuzhou 350108, China

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Abstract：

We study theoretically the construction of topological conducting domain walls with a finite width between AB/BA stacking regions via finite element method in bilayer graphene systems with tunable commensurate twisting angles. We find that the smaller is the twisting angle, the more significant the lattice reconstruction would be, so that sharper domain boundaries declare their existence. We subsequently study the quantum transport properties of topological zero-line modes which can exist because of the said domain boundaries via Green’s function method and Landauer−Büttiker formalism, and find that in scattering regions with tri-intersectional conducting channels, topological zero-line modes both exhibit robust behavior exemplified as the saturated total transmissionG_tot ≈ 2e²/h and obey a specific pseudospin-conserving current partition law among the branch transport channels. The former property is unaffected by Aharonov−Bohm effect due to a weak perpendicular magnetic field, but the latter is not. Results from our genuine bilayer hexagonal system suggest a twisting angle aroundθ ≈ 0.1° for those properties to be expected, consistent with the existing experimental reports.

Key words： twistronics lattice reconstruction topological domain wall zero-line mode quantum transport

收稿日期: 2021-10-20 出版日期: 2022-07-28

Corresponding Author(s): Zhenhua Qiao

引用本文:

. [J]. Frontiers of Physics, 2022, 17(6): 63503.
Junjie Zeng, Rui Xue, Tao Hou, Yulei Han, Zhenhua Qiao. Formation of topological domain walls and quantum transport properties of zero-line modes in commensurate bilayer graphene systems. Front. Phys. , 2022, 17(6): 63503.

链接本文:

https://academic.hep.com.cn/fop/CN/10.1007/s11467-022-1185-y
https://academic.hep.com.cn/fop/CN/Y2022/V17/I6/63503

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