研究目的
Investigating the influence of magnetic field on zero-line modes (ZLMs) in graphene and demonstrating the physical origin of their enhanced robustness.
研究成果
The presence of magnetic field not only enlarges the band gap, separating the ZLMs from the bulk states by a larger energy gap, but also spatially separates the wavefunction distributions of counter-propagating ZLMs. These effects strongly enhance the robustness of ZLMs against a disorder and make the ZLM transport property highly tunable by magnetic field.
研究不足
The study is theoretical and based on a tight-binding model, which may not capture all the complexities of real-world systems. The effects of spin-orbit coupling and other interactions are not considered.
1：Experimental Design and Method Selection:
The study employs nonequilibrium Green’s functions and the Landauer–Büttiker formula to investigate the transport properties of ZLMs in gated BLG systems under perpendicular magnetic field.
2：Sample Selection and Data Sources:
The system studied is a dual-split-gated bilayer graphene (BLG) device with opposite electric fields applied in neighboring regions.
3：List of Experimental Equipment and Materials:
The study uses a theoretical model based on the π-orbital tight-binding Hamiltonian of the system, including terms for intralayer and interlayer nearest-neighbor hopping, site energies, and Anderson disorder.
4：Experimental Procedures and Operational Workflow:
The electronic structure and ZLMs wavefunctions are studied by varying the strength of the magnetic field and the Fermi energy. The transport properties are calculated using a two-terminal Landauer–Büttiker formalism based on the Green’s function technique.
5：Data Analysis Methods:
The conductance of the ZLMs is calculated under different parameter strengths, including magnetic field strength, Fermi energy, and disorder strength, with each data point obtained by averaging the results of 30 samples with different disorder configurations.
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