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Scanning tunnelling microscopy shows that electrons in twisted bilayer graphene are strongly correlated for a wide range of density. In particular, a correlated regime appears near charge neutrality and theory suggests nematic ordering.

The ability to switch a semiconductor into a topological insulator would produce topological states on demand. Applying a time-dependent field to well-studied semiconductor quantum wells may lead to this kind of control.

Exploiting the intrinsic response of magic-angle twisted bilayer graphene to resonant terahertz radiation, the interplay between electron interactions and quantum geometry is studied in such flat-band systems.

All-electrical excitation of the hyperbolic phonon polaritons in hexagonal boron nitride by drifting charge carriers in nearby graphene results in electroluminescence at mid-infrared frequencies.

Previous investigations of Floquet states in solid state samples have been mostly based on ultrafast light excitations. Here, the authors report evidence of non-equilibrium steady states in graphene under continuous-wave mid-infrared irradiation, consistent with a long-lived Floquet phase physical picture.

The authors theoretically study superconductors that are terminated by a first-order phase transition to a correlated phase of different symmetry, referred to as the false vacuum. They propose that quenching across this transition leads to a nonequilibrium ephemeral superconductor, detectable with simple transport probes.

Bosonic qubits can be engineered to feature intrinsic protection against certain kinds of errors, which makes quantum error correction across many bosonic qubits possible with less overhead.

Searches for metastable states with properties not found in thermal equilibrium have been restricted to either ultrafast or slow timescales. A metastable state in an intermediate time window has now been identified in a photo-doped Mott insulator.

Driven quantum many-body systems can host finite densities of quasiparticles with the potential to realise emergent behaviour that is distinct from the equilibrium state. Werner et al. propose a method to cool holes in a correlated system so that more exotic low-entropy phases can be reached.

Topological quantum computation schemes — where quantum information is stored non-locally — provide, in theory, an elegant way of avoiding the deleterious effects of decoherence, but they have proved difficult to realize experimentally. A proposal to engineer topological phases into networks of one-dimensional semiconducting wires should bring topological quantum computers a step closer.

Materials exhibiting a significant shift current response could potentially outperform conventional solar cell materials. The authors propose a general design principle that exploits inter-orbital mixing to excite virtual multiband transitions in materials with multiple flat bands to achieve an enhanced shift current response.

The impulsively driven antiferromagnetic Mott insulator is a model quantum many-body system predicted to realize exotic transient phenomena, however its exploration in far-from equilibrium regimes remains experimentally challenging. Here, the authors use a combination of second harmonic optical polarimetry and coherent magnon spectroscopy to investigate the ultrafast non-equilibrium dynamics of the Mott insulator Sr₂IrO₄ and find evidence of a far-from-equilibrium critical regime where static and dynamic critical behaviour decouple and which could be present in a number of other quantum materials.