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<p>A tunable interface between flying photons and stationary quantum states is important for quantum networks. Quantum-confined charged excitons are attractive in this context because they combine single-photon emission with localized charge states. However, realizing nanoscale electrostatic confinement that is reversible, robust and spectroscopically resolvable remains challenging. Here we show luminous, quantum-confined charged excitons in monolayer WSe<sub>2</sub> using an electrostatic quantum nanocorral. A quantum corral was first realized using scanning tunnelling microscopy, where individual adatoms are arranged in a ring on a metal surface to confine electronic standing waves. In our approach, monolayer WSe<sub>2</sub> is gated through a nanoporous metallic monolayer less than 1-nm thick, which acts as an electric-field mask and defines confinement on ~10-nm length scales. This geometry creates distinct excitonic quasiparticle states inside and outside the nanopore, with ultrabright charged excitons confined by surrounding higher-energy neutral-exciton states. The resulting confinement produces pronounced energy splittings and clear spectroscopic signatures of discrete centre-of-mass modes. The electrostatic barrier is dynamically reconfigurable, allowing a crossover between zero- and two-dimensional excitonic states, while polarization-resolved measurements reveal signatures of fine-structure splitting. These results establish an electrically tunable route to controlling charged excitons for quantum light sources with adjustable brightness, energy and photon statistics.</p>

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Electrostatic quantum nanocorral for composite charged excitons

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Zhe Sun,
  • Mohamed Shehabeldin,
  • Jian Tang,
  • Mingyang Guo,
  • Zumeng Huang,
  • Tianxing Tang,
  • Tiema Qian,
  • Vsevolod Belosevich,
  • Thomas Siyuan Ding,
  • Jingdi Tang,
  • Yangchen He,
  • Ivona Košić,
  • Michael Geiwitz,
  • Kenji Watanabe,
  • Takashi Taniguchi,
  • Kenneth Stephen Burch,
  • Efrén Navarro-Moratalla,
  • Daniel Rhodes,
  • Chun Hung Lui,
  • Ni Ni,
  • Su-Yang Xu,
  • Qiong Ma

摘要

A tunable interface between flying photons and stationary quantum states is important for quantum networks. Quantum-confined charged excitons are attractive in this context because they combine single-photon emission with localized charge states. However, realizing nanoscale electrostatic confinement that is reversible, robust and spectroscopically resolvable remains challenging. Here we show luminous, quantum-confined charged excitons in monolayer WSe2 using an electrostatic quantum nanocorral. A quantum corral was first realized using scanning tunnelling microscopy, where individual adatoms are arranged in a ring on a metal surface to confine electronic standing waves. In our approach, monolayer WSe2 is gated through a nanoporous metallic monolayer less than 1-nm thick, which acts as an electric-field mask and defines confinement on ~10-nm length scales. This geometry creates distinct excitonic quasiparticle states inside and outside the nanopore, with ultrabright charged excitons confined by surrounding higher-energy neutral-exciton states. The resulting confinement produces pronounced energy splittings and clear spectroscopic signatures of discrete centre-of-mass modes. The electrostatic barrier is dynamically reconfigurable, allowing a crossover between zero- and two-dimensional excitonic states, while polarization-resolved measurements reveal signatures of fine-structure splitting. These results establish an electrically tunable route to controlling charged excitons for quantum light sources with adjustable brightness, energy and photon statistics.