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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.
Active matter exhibits a plethora of collective phenomena in both biological and artificial systems. In a model system of colloidal rollers, polar states in active liquids can be controlled.
Twisted double bilayer graphene is predicted to be a topological insulator under certain conditions. Simultaneous bulk and edge measurements now show metallic transport with a bulk bandgap, suggestive of this prediction.
The performance of superconducting devices can be degraded by quasiparticle generation mechanisms that are difficult to identify and eliminate. Now, a small superconducting island can be kept quasiparticle free for seconds at a time.
A semiconductor platform for experimentally investigating the multiorbital Bose–Hubbard model with long-range interactions is demonstrated. The interactions between the excitons are strong enough to reach the Mott insulator regime.
Accurate measurements of the ohm require high magnetic fields to support the quantum Hall effect. Now, high precision is achieved by using the quantum anomalous Hall effect in a low magnetic field, making the measurement much more accessible.
Although magnons in the quantum Hall regime of graphene have been detected, their thermodynamic properties have not yet been measured. Now, a local probe technique enables the detection of the magnon density and chemical potential.
Topological states that are created from strong electron–electron interactions at half-integer superlattice fillings are observed at zero magnetic field.
Propagating spin waves known as magnons are expected to carry a dipole moment in the quantum Hall regime. Now, this moment has been detected, demonstrating that the degrees of freedom of spin and charge are entangled in quantum Hall magnons.