Vanishing Polarizability of Dark Excitons in WSe<sub>2</sub>: Implications for Noise-Resilient Quantum States.
basic_science · Level V
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- Record sourced from PubMed, PMID 42041105.
- Also identified by DOI 10.1021/acs.nanolett.6c01047 and PMC identifier 13154348.
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Abstract
The spin-triplet dark excitons in transition metal dichalcogenides, such as WS<sub>2</sub> and WSe<sub>2</sub>, are promising for quantum information processing due to their long lifetimes and robust spin-valley states. While effectively utilizing these states requires a precise understanding of their modulation by external controls, it remains less explored compared to the bright counterparts. Here, we investigate the out-of-plane electric field dependence of the neutral dark (<i>D</i><sup>0</sup>) exciton in the dual-gated monolayer WSe<sub>2</sub>. Contrary to the large Stark shifts observed in interlayer excitons, we demonstrate that the <i>D</i><sup>0</sup> exciton exhibits a vanishingly small polarizability (<6.7 × 10<sup>-10</sup> D·mV<sup>-1</sup>). We attribute this electrical immunity to strong spatial confinement. Crucially, we show that this insensitivity extends to the magnetic response, where the <i>g</i>-factor remains robust against electric field variations. Our results establish the dark exciton as a noise-resilient building block for future spin-valley quantum information processing.