Sitting Acquisition and Early Communication Development: Are There Associations in Very Preterm Infants at Six Months of Corrected Age?

: Research in typically and some atypically developing populations showed associations between early motor and communication development, documenting how postural development can support communicative advancements. However, these relations have scarcely been investigated in the preterm population. : The present study aimed to describe motor (gross and fine motor) and communication (receptive and expressive) skills of very preterm infants at six months of corrected age and their associations, focusing on sitting posture achievement and early vocal production.

Tunable non-integer high-harmonic generation in a topological insulator.

When intense lightwaves accelerate electrons through a solid, the emerging high-order harmonic (HH) radiation offers key insights into the material. Sub-optical-cycle dynamics-such as dynamical Bloch oscillations, quasiparticle collisions, valley pseudospin switching and heating of Dirac gases-leave fingerprints in the HH spectra of conventional solids. Topologically non-trivial matter with invariants that are robust against imperfections has been predicted to support unconventional HH generation.

Two-Dimensional-Dirac Surface States and Bulk Gap Probed via Quantum Capacitance in a Three-Dimensional Topological Insulator.

BiSbTeSe is a 3D topological insulator (3D-TI) with Dirac type surface states and low bulk carrier density, as donors and acceptors compensate each other. Dominating low-temperature surface transport in this material is heralded by Shubnikov-de Haas oscillations and the quantum Hall effect. Here, we experimentally probe and model the electronic density of states (DOS) in thin layers of BiSbTeSe by capacitance experiments both without and in quantizing magnetic fields.

Magnetoconductance, Quantum Hall Effect, and Coulomb Blockade in Topological Insulator Nanocones.

Magnetotransport through cylindrical topological insulator (TI) nanowires is governed by the interplay between quantum confinement and geometric (Aharonov-Bohm and Berry) phases. Here, we argue that the much broader class of TI nanowires with varying radius-for which a homogeneous coaxial magnetic field induces a varying Aharonov-Bohm flux that gives rise to a nontrivial masslike potential along the wire-is accessible by studying its simplest member, a TI nanocone. Such nanocones allow us to observe intriguing mesoscopic transport phenomena: While the conductance in a perpendicular magnetic field is quantized due to higher-order topological hinge states, it shows resonant transmission through Dirac Landau levels in a coaxial magnetic field.