Signatures of fractional charges via anyon–trions in twisted MoTe2
Article Date: 04 February 2026
Article URL: https://www.nature.com/articles/s41586-026-10101-w
Article Image: https://media.springernature.com/w215h120/springer-static/image/art%3A10.1038%2Fs41586-023-06289-w/MediaObjects/41586_2023_6289_Fig1_HTML.png
Summary
The authors report optical evidence for fractionally charged quasiparticles in fractional Chern insulator (FCI) states formed in twisted bilayer MoTe2. Using photoluminescence spectroscopy of quantum-confined trions (charged excitons) trapped in local potential wells, they observe new emission peaks that appear only when the system is slightly doped into FCI states. These peaks are red-shifted relative to ordinary trions but share the same dependence on electric field, temperature and magnetic field, consistent with a picture in which a trion binds an elementary fractional quasiparticle — an “anyon–trion.” Crucially, the measured ratio of binding energies for anyon–trions in the −2/3 and −3/5 FCI states matches the expected fractional-charge ratio e/3 : e/5, giving direct spectroscopic evidence for fractional charge in an FCI. The work positions trion spectroscopy as a complementary probe to transport and tunnelling measurements for detecting anyonic excitations in moiré materials.
Key Points
- Experiment performed on twisted MoTe2 moiré heterostructures; quantum-confined trions probed by photoluminescence (PL).
- Distinct PL features (anyon–trions) appear only within slightly doped FCI states and are red-shifted relative to standard trions.
- Anyons inferred from matched dependencies: electric field, temperature and magnetic field responses of anyon–trions and trions are consistent.
- Ratio of binding energies for anyon–trions at ν = −2/3 and ν = −3/5 agrees with the expected fractional-charge ratio e/3 : e/5 — strong evidence for fractional charge.
- Additional data (fan diagrams, RMCD mapping, trap-resolved spectra and intensity anticorrelations) support the identification and local nature of anyon–trions.
- Trion spectroscopy is demonstrated as a practical, local optical probe of fractionally charged excitations in FCIs, complementary to transport/tunnelling techniques.
Context and relevance
Fractionalisation of electron charge and anyonic statistics are landmark predictions of strongly correlated topological phases (historically in the fractional quantum Hall effect). Recent progress in moiré transition-metal dichalcogenides has realised zero-field fractional Chern insulators, but direct detection of their fractional quasiparticles has been challenging. This study provides a new, optical route — via trapped trions — to sense fractionally charged quasiparticles locally in twisted MoTe2. The result ties into ongoing efforts to detect and manipulate anyons in solid-state platforms and to use moiré materials as a versatile playground for correlated topological physics.
Author style
Punchy: This is a clear, high-impact result — optical spectroscopy that directly links measured binding-energy ratios to expected fractional charges. If you follow topological moiré materials or anyon detection, this paper is worth reading carefully: it presents a new, local probe and compelling evidence for fractional charge in an FCI.
Why should I read this?
Short version — it’s clever and useful. The team found a way to spot fractionally charged particles by watching how charged excitons behave when they trap those quasiparticles. If you care about anyons, moiré materials or new measurement tricks that don’t rely only on transport, this saves you time: the paper shows a practical optical signature and backs it with solid comparative data.