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Large negative magnetoresistance is usually related to magnetism and the exceptions are rare. Here, Breuniget al. report a large negative magnetoresistance in a topological insulator, TlBi_0.15Sb_0.85Te₂, which is likely due to the Zeeman effect on a barely percolating current path formed in the disordered bulk.

In topological insulator nanowires quantized Dirac sub-bands are expected, but direct evidence is still missing. Here, the authors report signatures of sub-bands in the gate-voltage dependence of the resistance by tuning the chemical potential in (Bi_1−xSb_x)₂Te₃ nanowires through the Dirac point.

The transport measurements of an interacting fermionic quantum gas in an optical lattice provide a direct experimental realization of the Hubbard model—one of the central models for interacting electrons in solids—and give insights into the transport properties of many-body phases in condensed-matter physics.

Numerical simulations suggest that disorder and damping have little effect on the current-induced motion of nanoscale magnetic whirls known as skyrmions.

Domain walls mark boundaries between magnetic regions. Here, the authors show that external radiation can efficiently propel them, leading to a state where domain walls are not static but actively moving.

A first-order phase transition between two crystalline phases of magnetic whirls sheds light on the role of topology in magnetic transitions.

Skyrmions are a special type of particle that has long been predicted to exist in many fields of physics. Direct images of these structures have now been made in a magnetic material.

The creation and destruction of magnetic whirls by the application of an electric field may be the basis for novel memory technologies.

Interactions between a localized magnetic moment and electrons in a metal can produce an emergent resonance that affects the metal’s properties. A realization of this Kondo effect in MoS₂ provides an opportunity to study it in microscopic detail.

Topological states of matter cannot be distinguished on the basis of local measurements in the bulk of the material. Here the authors report on the observation of an edge state between two topological distinct phases of an ultracold atomic one-dimensional system using optical microscopy.

Integrable models have an infinite number of conserved quantities but most realizations suffer from integrability breaking perturbations. Here the authors show that weakly driving such a system by periodic perturbations leads to large nonlinear responses governed by the approximate conservation laws.

While in 3D materials melting is a single, first-order phase transition, in 2D systems, it can also proceed via an intermediate phase. For a skyrmion lattice in Cu₂OSeO₃, magnetic field variations can tune this quasiparticle 2D solid into a skyrmion liquid via an intermediate hexatic phase with short-range translational and quasi-long-range orientational order.

Topological surface states can lose their protection in many ways but the subtle mechanisms remain far from well understood. Here, Taskin et al. report a novel planar Hall effect in dual-gated Bi_2−x Sb _x Te₃ thin films, originating from anisotropic lifting of time reversal symmetry protection by an in-plane magnetic field.