Efficient Chebyshev polynomial approach to quantum conductance calculations: Application to twisted bilayer graphene

Abstract

In recent years, Chebyshev polynomial expansions of tight-binding Green's functions have been successfully applied to the study of a wide range of spectral and transport properties of materials. However, the application of the Chebyshev approach to the study of quantum transport properties of noninteracting mesoscopic systems with leads has been hampered by the lack of a suitable Chebyshev expansion of Landaeur's formula or one of its equivalent formulations in terms of Green's functions in Keldysh's perturbation theory. Here, we tackle this issue by means of a hybrid approach that combines the efficiency of Chebyshev expansions with the convenience of complex absorbing potentials to calculate the conductance of two-terminal devices in a computationally expedient and accurate fashion. The versatility of the approach is demonstrated for mesoscopic twisted bilayer graphene (TBG) devices with up to $2.3\times 10^6$ atomic sites. Our results highlight the importance of moiré effects, interlayer scattering events and twist-angle disorder in determining the conductance curves in devices with a small twist angle near the TBG magic angle ${\theta }_m\approx 1.1^{\circ }$.

arXiv comment11 pages, 4 figures

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• Reconciling Kubo and Keldysh Approaches to Fermi-Sea-Dependent Nonequilibrium Observables: Application to Spin Hall Current and Spin-Orbit Torque in Spintronics
• General method for calculating transport properties of disordered mesoscopic systems based on the nonequilibrium Green's function formalism
• Structural dependence of quantum transport properties on topological nodal-line semimetal bilayer borophene