Work

Vanishing Polarizability of Dark Excitons in WSe 2 : Implications for Noise-Resilient Quantum States

Year: 2026

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide The spin-triplet dark excitons in transition metal dichalcogenides, such as WS 2 and WSe 2, 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 ( D 0 ) exciton in the dual-gated monolayer WSe 2 . Contrary to the large Stark shifts observed in interlayer excitons, we demonstrate that the D 0 exciton exhibits a vanishingly small polarizability (<6.7 × 10 –10 D·mV –1 ). We attribute this electrical immunity to strong spatial confinement. Crucially, we show that this insensitivity extends to the magnetic response, where the g -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.

Source: Nano Letters

DOI: 10.1021/acs.nanolett.6c01047