Skyrmion Fluid and Bimeron Glass Protected by a Chiral Spin Liquid on a Kagome Lattice.

Skyrmions are of interest both from a fundamental and technological point of view, due to their potential to act as information carriers. But one challenge concerns their manipulation, especially at high temperature where thermal fluctuations eventually disintegrate them. Here we study the competition between skyrmions and a chiral spin liquid, using the latter as an entropic buffer to impose a quasivacuum of skyrmions. As a result, the temperature becomes a knob to tune the skyrmion density from a dense liquid to a diluted gas, protecting the integrity of each skyrmion from paramagnetic disintegration. With this additional knob in hand, we find at high field a topological spin glass made of zero- and one-dimensional topological defects (respectively skyrmions and bimerons).

[Traction of impacted teeth using bone anchorage and cantilever springs: a case report]. / Traction de dents incluses au moyen d'ancrages osseux et de ressorts cantilever : un rapport de cas.

Egression and orthodontic traction can lead to parasitic movements on the anchoring elements. It is often necessary to use a device including several dental elements sometimes associated with traction auxiliaries. The author, through clinical cases, will develop his therapeutic approach, to limit these parasitic movements as much as possible. The use of a bone anchorage associated with a cantilever arch improves the management of this frequent orthodontic problem.

Hole properties on and off magnetization plateaus in 2D antiferromagnets.

The phenomenon of magnetization plateaus in antiferromagnets under a magnetic field has always been an important topic in magnetism. We propose to probe the elusive physics of plateaus in 2D by considering a hole-doped antiferromagnet and studying the signatures of magnetization plateaus in terms of the properties of holes, coupled to an effective gauge field generated by the spin sector. The latter mediates interaction between the holes, found to be algebraically decaying and long ranged with both Coulombic and dipolar forms outside the plateau and short ranged (local) inside the plateau. The resulting hole spectral weight is significantly broadened off plateau, while it remains sharply peaked on plateau. We also extend the result obtained for a 1D system where finite hole doping gives rise to a shift in the magnetization value of the plateaus.

Miniscrews: a simple alternative for complex treatments.

The use of mini-implants has already considerably changed the way we plan and perform a large number of orthodontic treatments to the point where, today, we can envisage taking a fresh look at some of our "classical" treatment options. This article will describe a number of clinical cases drawn from several years' experience of working with miniscrews. We present first a brief flashback and an overview of the different indications for micro-implants followed by four case studies presenting treatments which, without miniscrews, would have been treated by much more aggressive approaches.

[Orthopedic treatment of dento-skeletal Class II by the association minivis + Forsus(TM): a clinical case]. / Le traitement orthopédique de la classe II squelettique par l'association minivis + Forsus(TM) : à propos d'un cas.

The use of customized combination mechanics with two auxillaries such as mini screws and Forsus(TM) Springs that up to now have been used independently, achieved unexpected results in the correction of a non-surgical skeletal Class II malocclusion. The use of mini implants to control the canting of the occlusal plane that is frequently reported during the use of hyperpropulsors with fixed appliances made it possible to achieve a better mandibular outcome.

European College of Orthodontics: commission of affiliation and titularisation.

Date of birth: 18/04/96; sex: male. A PRE-TREATMENT DOCUMENTS: 03/2008; 11 yrs 9 m. DIAGNOSIS: Skeletal Class II, hypodivergent; Full molar and canine Class II; End of mixed dentition. B POSTTREATMENT DOCUMENTS: 07/2010; 14 yrs 3 m. RETENTION: Maxillary Hawley retainer; wire bonded lingually from 33 to 43. C DOCUMENTS AT END OF RETENTION: 07/2011; 15 yrs 3 m.

Random quantum Ising chains with competing interactions.

In this paper we discuss the criticality of a quantum Ising spin chain with competing random ferromagnetic and antiferromagnetic couplings. Quantum fluctuations are introduced via random local transverse fields. First we consider the chain with couplings between first and second neighbors only and then generalize the study to a quantum analog of the Viana-Bray model, defined on a small world random lattice. We use the Dasgupta-Ma decimation technique, both analytically and numerically, and focus on the scaling of the lattice topology, whose determination is necessary to define any infinite disorder transition beyond the chain. In the first case, at the transition the model renormalizes towards the chain, with the infinite disorder fixed point described by Fisher. This corresponds to the irrelevance of the competition induced by the second neighbors couplings. As opposed to this case, this infinite disorder transition is found to be unstable towards the introduction of an arbitrary small density of long range couplings in the small world models.