Optically Probing Tunable Band Topology in Atomic Monolayers

Abstract

In many atomically thin materials their optical absorption is dominated by excitonic transitions. It was recently found that optical selection rules in these materials are influenced by the band topology near the valleys. We propose that gate-controlled band ordering in a single atomic monolayer, through changes in the valley winding number and excitonic transitions, can be probed in helicity-resolved absorption and photoluminescence. This predicted tunable band topology is confirmed by combining an effective Hamiltonian and a Bethe-Salpeter equation for an accurate description of excitons, with first-principles calculations suggesting its realization in Sb-based monolayers.

arXiv comment7 pages, 4 figures, accepted in PRL

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• Optimizing Topological Switching in Confined 2D-Xene Nanoribbons via Finite-Size Effects
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• Engineering Majorana corner modes from two-dimensional hexagonal crystals
• Spin-Hall conductivity and optical characteristics of noncentrosymmetric quantum spin Hall insulators: the case of PbBiI
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• Many-body description of two-dimensional van der Waals ferroelectric $\alpha -$In${}_2$Se${}_3$