Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.157402
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Funding
- U.S. DOE, Office of Science BES [DE-SC0004890]
- German Research Foundation (DFG) [SFB 1170, 258499086]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat [EXC 2147, 390858490]
- ENB Graduate School on Topological Insulators
- University at Buffalo Center for Computational Research (UB CCR)
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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.
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