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The magnetic field dependence of the electrical resistance of topological insulators is not well understood. Zhang et al.now incorporate a magnetic topological insulator into a field effect transistor and identify unconventional magnetoresistance behaviour that could be useful in sensing and data storage.

The unique band structure of topological insulators gives rise to insulating bulk and unusual metallic surface properties. By tuning the content of Sb in the ternary compound (Bi_1–xSb_x)₂Te₃, Wang and collaborators show it is possible to control the precise features of the band structure in a continuous fashion.

Excitonic quantum oscillations are observed in correlated electron–hole bilayers and quantum phase transitions are identified between excitonic insulator and bilayer quantum Hall states under strong magnetic fields.

Moiré superlattices offer a tunable platform for studying charge and spin phenomena in correlated solid-state systems. Here, the authors explore spin transport in twisted WSe₂/WS₂ superlattices and find signatures of spin–charge transport decoupling.

By combining large-scale first-principles GW-BSE calculations and micro-reflection spectroscopy, the nature of the exciton resonances in WSe₂/WS₂ moiré superlattices is identified, highlighting non-trivial exciton states and suggesting new ways of tuning many-body physics.

The electric field generated by a gate electrode is exploited to trigger a reversible ferromagnetic–paramagnetic phase transition in a magnetic topological insulator close to a quantum critical point.

Improvement in sample quality has resulted in the first observation of the quantum Hall effect in a black phosphorus two-dimensional electron system.

Investigation of the electronic structure in few-layer phosphorene reveals optical transitions relevant for technologically important electronic and optoelectronic applications.

Employing a remote Coulomb superlattice formed by twisted bilayer WS₂, the authors demonstrate the engineering and on/off switching of a Coulomb superlattice of correlated states in bilayer graphene with period and strength determined by the remote superlattice.

Transition metal dichalcogenide bilayers offer a novel platform for studying correlated electron-hole fluids. Here the authors use optical spectroscopy to probe thermodynamic properties of coupled electron-hole states in MoSe₂/hBN/WSe₂ heterostructures, providing evidence for an excitonic insulator ground state.

Surface plasmons have unique physical properties that make them also interesting for technology. Here, the authors observe plasmons in mixed-dimensional heterostructures that can be highly modulated with electrostatic gating, which may be explained by plasmon hybridization

By using new on-chip terahertz spectroscopy techniques to measure the absorption spectra of a graphene microribbon as well as the energy waves close to charge neutrality, hydrodynamic collective excitations are observed.

When independent layers of electrons and holes are in close proximity to each other, their Coulomb interaction allows them to pair into neutral bosons and form an insulating state. This phenomenon is reported in a heterostructure of 2D materials.

Strongly correlated insulating Mott and generalized Wigner phases are detected in WSe₂/WS₂ moiré superlattices, and their electrical properties and excited spin states are studied using an optical technique.