Catálogo de publicaciones - revistas

<jats:title>Trying to break a stubborn law</jats:title> <jats:p> The electrical resistivity of most metals at low temperatures has a characteristic quadratic dependence on temperature. This law is typically ascribed to the scattering of electrons off each other in the presence of a crystal lattice. By measuring the resistivity of SrTiO <jats:sub>3</jats:sub> with varying dopant concentrations, Lin <jats:italic>et al.</jats:italic> test the applicability of the law for metals with low carrier densities. The law persists down to the lowest carrier concentrations, into the regime where the conditions for this behavior were previously thought to break down. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6251" page="945" related-article-type="in-this-issue" vol="349" xlink:href="10.1126/science.aaa8655">945</jats:related-article> </jats:p>

<jats:title>Magnetizing a topological insulator</jats:title> <jats:p> Inducing magnetism in a topological insulator can lead to exotic effects. The usual experimental route is to introduce magnetic dopants into the material, but that approach is intricate and creates unwanted disorder. Wang <jats:italic>et al.</jats:italic> used a simpler technique: They fabricated a bilayer consisting of Bi <jats:sub>2</jats:sub> Se <jats:sub>3</jats:sub> , a topological insulator, and EuS, a magnet. The physical proximity of EuS induced magnetism on the surface of Bi <jats:sub>2</jats:sub> Se <jats:sub>3</jats:sub> . This approach allowed for the creation of magnetic domains at will and the detection of characteristic current flowing along the domains' edges. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6251" page="948" related-article-type="in-this-issue" vol="349" xlink:href="10.1126/science.aaa0508">948</jats:related-article> </jats:p>

<jats:title>Manipulation of a quantum squeeze</jats:title> <jats:p> The uncertainty principle of quantum mechanics dictates that even when a system is cooled to its ground state, there are still fluctuations. This zero-point motion is unavoidable but can be manipulated. Wollman <jats:italic>et al.</jats:italic> demonstrate such manipulation with the motion of a micrometer-sized mechanical system. By driving up the fluctuations in one of the variables of the system, they are able to squeeze the other related variable below the expected zero-point limit. Quantum squeezing will be important for realizing ultrasensitive sensors and detectors. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6251" page="952" related-article-type="in-this-issue" vol="349" xlink:href="10.1126/science.aac5138">952</jats:related-article> </jats:p>