Topological magnetotransport in modified-Haldane systems

TL;DR

This paper theoretically investigates topological magnetotransport and magneto-optical properties in modified-Haldane systems, revealing tunable topological phases and optical signatures in 2D materials like buckled Xene and TMDC monolayers.

Contribution

It introduces a comprehensive theoretical framework for analyzing topological phases and optical responses in modified-Haldane models applied to various 2D materials.

Findings

Identification of distinct topological regimes via sublattice potential and spin-orbit coupling.

Prediction of optical signatures from inter-Landau-level transitions.

Demonstration of electrically tunable topological phase transitions in buckled silicene.

Abstract

We present a theoretical study of quantum magneto-transport and magneto-optical (M-O) properties in modified-Haldane model; which is applicable to diverse classes of two-dimensional (2D) quantum materials such as buckled Xene monolayers and transition metal dichalcogenide (TMDC) monolayers. By varying the staggered sublattice potential and intrinsic spin-orbit coupling, we identify distinct topological regimes and analyze their manifestations in the emergence of Landau levels, the evolution of the density of states, and the characteristics of M-O absorption spectra. Using the Kubo formalism, we compute the longitudinal and Hall M-O conductivities and show that inter-Landau-level (inter-LL) transitions produce characteristic resonance features that provide optical signatures of the underlying topological phases. Within this framework, we demonstrate electrically tunable topological phase transitions in buckled silicene. Extending our study to monolayer TMDCs, we show that inspite of large band gap, the spin-valley coupling provides a powerful tool for tailoring M-O absorption features across wide range of 2D materials. Collectively, these results underscore modified-Haldane-model materials as an ideal testbed for engineering quantum transport, with promising applications in topological photonics, valleytronic devices, and next-generation optoelectronics.