Highly energy-tunable quantum light from moiré-trapped excitons

H Baek, M. Brotons-Gisbert, Z. X. Koong, A. Campbell, M. Rambach, K. Watanabe, T. Taniguchi, B. D. Gerardot

Research output: Contribution to journalArticle

Abstract

Photon antibunching, a hallmark of quantum light, has been observed in the correlations of light from isolated atomic and atomic-like solid-state systems. Two-dimensional semiconductor heterostructures offer a unique method to create a quantum light source: Moiré trapping potentials for excitons are predicted to create arrays of quantum emitters. While signatures of moiré-trapped excitons have been observed, their quantum nature has yet to be confirmed. Here, we report photon antibunching from single moiré-trapped interlayer excitons in a heterobilayer. Via magneto-optical spectroscopy, we demonstrate that the discrete anharmonic spectra arise from bound band-edge electron-hole pairs trapped in moiré potentials. Last, we exploit the large permanent dipole of interlayer excitons to achieve large direct current (DC) Stark tuning up to 40 meV. Our results confirm the quantum nature of moiré-confined excitons and open opportunities to investigate their inhomogeneity and interactions between the emitters or energetically tune single emitters into resonance with cavity modes.

Original languageEnglish
Article numbereaba8526
JournalScience Advances
Volume6
Issue number37
DOIs
Publication statusPublished - 9 Sep 2020

ASJC Scopus subject areas

  • General

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    Baek, H., Brotons-Gisbert, M., Koong, Z. X., Campbell, A., Rambach, M., Watanabe, K., Taniguchi, T., & Gerardot, B. D. (2020). Highly energy-tunable quantum light from moiré-trapped excitons. Science Advances, 6(37), [eaba8526]. https://doi.org/10.1126/sciadv.aba8526