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Fractional Chern insulators have been observed in moiré MoTe₂ at zero magnetic field, but the expected zero longitudinal resistance has not been demonstrated. Now it is shown that improving device quality allows this effect to appear.

Optical control of integer and fractional Chern insulators is demonstrated by circularly polarized optical pumping in tMoTe₂.

In analogy with quantum Hall systems, it may be possible to find non-abelian anyons in the higher bands of Chern insulators. Now, the phase diagram of the second moiré band of twisted MoTe₂ is explored, laying the groundwork for such investigations.

The bulk–edge correspondence is directly imaged in a fractional Chern insulator at zero magnetic field with exciton-resonant microwave impedance microscopy, revealing spatially resolved bulk and edge characteristics, and the evolution of topological states in twisted MoTe₂.

The authors image non-equilibrium exciton phase-transition dynamics in moiré superlattices, revealing how strong long-range dipolar repulsion freezes the motion of the Mott insulator over a timescale of tens of nanoseconds.

The authors report on the emergence of intercell moiré exciton complexes where, in H-stacked WS₂/WSe₂ heterobilayers, the exciton’s hole from the WSe₂ layer is surrounded by its bound electron’s wavefunction distributed among three adjacent moiré traps in the WS₂ layer exhibiting an out-of-plane dipole and in-plane quadrupole.

Transport measurements in twisted bilayer MoTe₂ reveal quantized Hall resistance plateaus and composite Fermi liquid-like behaviour under zero magnetic field, constituting a direct observation of integer and fractional quantum anomalous Hall effects.

Strong dipole–dipole interactions between excitons in a moiré superlattice create a manifestation of the Bose–Hubbard model with a ground state similar to a Mott insulator.

The topological properties of twisted bilayer MoTe₂ are thought to stem from a spatial texture in the layer polarization of the electronic wavefunctions. This polarization is now measured using scanning tunnelling microscopy.

Using the unique valley properties of a twisted MoTe₂ bilayer, measurements of the degree of circular polarization of trion photoluminescence reveal optical signatures of a zero-field composite Fermi liquid.

A nanoscale superconducting sensor used to map the magnetic fringe fields in twisted bilayers of MoTe₂ shows the formation of fractional Chern insulator states at zero magnetic field.

A study reveals light as a new dynamic knob to control ferromagnetic order in moiré superlattices.