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The presence or absence of a strange metal phase in twisted bilayer graphene has been controversial. Now, measurements over a wide range of temperature and doping give much stronger evidence for its existence.
Correlated insulating states are common in twisted bilayer graphene when the density of carriers is close to an integer per moiré unit cell. Now, such states emerge at half-integer fillings and show signs of being spin or charge density waves.
The nuclear spins of noble gases are isolated from sources of decoherence but also from external control fields. Optically addressable alkali-metal atoms can couple strongly to noble-gas spins, potentially providing a mechanism for coherent control.
Many nanophotonic devices rely on optical nonlinearities, which can be indirectly engineered. The quantum interference of different nonlinear pathways directly controls the Kerr nonlinearity without changing the device design.
The change in a band structure when a magnetic field is applied should depend on the momentum of the electronic state, but this is hard to measure. Now, this effect is demonstrated in a topological magnet.
The capabilities of optically accessible Rydberg levels are limited by their lifetime. An experiment demonstrates how to detect and manipulate long-lived circular states through the coupling of valence electrons in alkaline-earth Rydberg atoms.
The Mott metal-to-insulator transition plays a key role in theoretical studies of high-temperature superconductors. A mathematical analysis of the theory of metals identifies a renormalization-group fixed point describing Mott physics.
A spin glass is a disordered system with randomized competing magnetic interactions. Now, a metamaterial artificial spin glass based on nanomagnets is reported, with rudimentary features of a neural network.
A heterostructure supports the equilibrium bound states of an electron and hole—excitons—that strongly interact with each other. This provides a platform for the quantum simulation of bosonic lattice models.
How electrons in moiré graphene populate valleys and carry spin has consequences for understanding its superconductivity. Now, evidence suggests that twisted trilayer graphene has a spin-polarized, valley-unpolarized configuration.
Rheological measurements combined with a fully calibrated model show that growth-induced pressure increases macromolecular crowding, inhibiting protein expression and cell growth.
Observation of a high-pressure insulating state in cuprate superconductors provides a fresh challenge for understanding the mechanism of superconductivity in these materials.
Earlier measurements of quantized heat transport in the spin liquid candidate α-RuCl3 agreed with the predictions of Majorana edge modes. Support for this interpretation now comes from the observations of quantization across a large parameter range.
A DNA-binding protein condenses on DNA via a switch-like transition. Surface condensation occurs at preferential DNA locations suggesting collective sequence readout and enabling sequence-specificity robustness with respect to protein concentration.
An electron with a linear dispersion relation should contribute half of a quantum of Hall conductance and thereby manifest the parity anomaly. This is demonstrated in a heterostructure of topological insulator materials.
In burning plasma, alpha particles from fusion reactions are the dominant source of heating. The design choices that resulted in reaching this state in experiments at the National Ignition Facility are reported.
Spin–orbit coupling is an important feature of isolated quantum systems, but less is known about how it responds to dissipation. An experiment in a cold atomic gas now shows how these two effects enable topologically robust spin transfer.
Studies of first-order phase transitions in quantum simulators have so far been restricted to the weakly interacting regime. A tunable discontinuous phase transition has now been realized with strongly correlated atoms in a driven optical lattice.
The precise nature of the charge-density-wave state in kagome superconductors remains unclear. Now, local spectroscopy shows that rotational symmetry in real space is broken, with one direction being distinct from the other two.