Archive for the ‘Nature’ Category

Posted by Kenneth Burch On November - 2 - 2018 Comments Off on Magnetism in two-dimensional van der Waals materials

The discovery of materials has often introduced new physical paradigms and enabled the development of novel devices. Two-dimensional magnetism, which is associated with strong intrinsic spin fluctuations, has long been the focus of fundamental questions in condensed matter physics regarding our understanding and control of new phases. Here we discuss magnetic van der Waals materials: two-dimensional atomic crystals that contain magnetic elements and thus exhibit intrinsic magnetic properties. These cleavable materials provide the ideal platform for exploring magnetism in the two-dimensional limit, where new physical phenomena are expected, and represent a substantial shift in our ability to control and investigate nanoscale  [ Read More ]

Posted by Kenneth Burch On September - 11 - 2012 Comments Off on Proximity-induced high-temperature superconductivity in topological insulators

Our team has developed a simple new technique using Scotch poster tape that has enabled us to induce high-temperature superconductivity in a semiconductor for the first time. Interest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive Majorana fermion at the interface between topological insulators and superconductors. Here we produce high-temperature superconductivity in Bi2Se3 and Bi2Te3 via proximity to Bi2Sr2CaCu2O8+δ, to access higher temperature and energy scales for this phenomenon. This was achieved by a new mechanical bonding technique that we developed, enabling the fabrication of high-quality junctions between materials,  [ Read More ]