Robust weak antilocalization due to spin-orbital entanglement in Dirac material Sr3SnO.

The presence of both inversion (P) and time-reversal (T) symmetries in solids leads to a double degeneracy of the electronic bands (Kramers degeneracy). By lifting the degeneracy, spin textures manifest themselves in momentum space, as in topological insulators or in strong Rashba materials. The existence of spin textures with Kramers degeneracy, however, is difficult to observe directly. Here, we use quantum interference measurements to provide evidence for the existence of hidden entanglement between spin and momentum in the antiperovskite-type Dirac material Sr3SnO. We find robust weak antilocalization (WAL) independent of the position of EF. The observed WAL is fitted using a single interference channel at low doping, which implies that the different Dirac valleys are mixed by disorder. Notably, this mixing does not suppress WAL, suggesting contrasting interference physics compared to graphene. We identify scattering among axially spin-momentum locked states as a key process that leads to a spin-orbital entanglement.

Localization Effects on Magnetotransport of a Disordered Weyl Semimetal.

We study longitudinal magnetotransport in a disordered Weyl semimetal taking into account localization effects in the vicinity of a Weyl node exactly. In a magnetic field, a single chiral Landau level coexists with a number of conventional nonchiral levels. Disorder scattering mixes these topologically different modes leading to very strong localization effects. We derive the average conductance as well as the full distribution function of transmission probabilities along the field direction. Remarkably, we find that localization of the nonchiral modes is greatly enhanced in a strong magnetic field with the typical localization length scaling as 1/B. Technically, we use the nonlinear sigma-model formalism with a topological term describing the chiral states. The problem is solved exactly by mapping to an equivalent transfer matrix Hamiltonian.

Minor [correction of Mi1nor] burns and pneumatocoeles: a case report.

Minor burns in children need to be cautiously managed as they may manifest with life threatening complications especially in the presence of staphylococcal infection. A one and a half year old child with minor burns (12% TBSA), who developed large pneumatocoeles and peumomediastinum following Staphylococcus aureus pneumonia causing severe respiratory distress and needing ventilatory support is presented. Most of the pneumatocoeles were spontaneously absorbed over a period of 10 days while surgical interference was being contemplated. A conservative approach to pneumatocoeles as in non-burn patients may help prevent unnecessary surgery. An extensive English literature search (since 1966) did not reveal any report of pneumatocoeles in association with burns and therefore we believe this to be the first report of its kind.

Acute pancreatitis associated with brucellosis.

To the best of our knowledge, no case of acute pancreatitis associated with brucellosis has been reported. This report details the occurrence of acute pancreatitis in which Brucella melitensis was cultured from blood. We discuss various diagnostic tests and the recommended therapy for brucellosis.