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“#An unusual superconductor” (a) The lattice structure of PdTe2, indicating that it is a centrosymmetric system. (b) The in-plane magnetic field dependent sheet resistance at different temperatures for 6-ML PdTe2 film. (c) The temperature dependence of in-plane critical fields (the black spheres) of 6-ML PdTe2 film, which is consistent with the theoretical formula of Ising…
“#Topological superconducting phase protected by 1-D local magnetic symmetries” Credit: CC0 Public Domain Topological superconductors (TSCs) are new kind of topological quantum states with fully superconducting gapped band structure in the bulk, but they support gapless excitations called Majorana zero modes (MZMs) at the boundaries. Because of their nonlocal correlation and non-Abelian statistic nature, MZMs…
“#Investigation of five-layered cuprate reveals Fermi pockets” Small Fermi pockets revealed by laser-ARPES. Credit: Science (2020). DOI: 10.1126/science.aay7311 A team of researchers affiliated with a host of institutions in Japan and one in the U.K has observed Fermi pockets during experiments with a five-layered cuprate, confirming theories. In their paper published in the journal Science,…
“#Research team exactly solves experimental puzzle in high temperature superconductivity” Comparison between the superconducting state of a traditional metal and the doped Mott insulator. The presence of two bands in the HK model sets the two apart and a superconducting energy gap forms on each. Credit: Phillips, et al., Illinois Physics Forty-five years after superconductivity…
“#Steps toward room-temperature superconductivity” Layers of molybdenum carbide and molybdenum sulfide allow superconductivity at 50 percent higher temperatures. Credit: Elizabeth Flores-Gomez Murray/ Penn State The possibility of achieving room temperature superconductivity took a tiny step forward with a recent discovery by a team of Penn State physicists and materials scientists. The surprising discovery involved layering…
“#Contest between superconductivity and insulating states in ‘magic angle’ graphene” Close-up of the device (the twisted bilayer graphene structure is in the black center region on both squares with gold borders). This device is placed on the experimental setup within the fridge. Credit: ICFO If you stack two layers of graphene one on top of…
“#Toward super-fast motion of vortices in superconductors” Abrikosov lattice at moderate vortex velocities (left); ultra-fast moving Abrikosov-Josephson “vortex rivers” (right). Credit: Oleksandr Dobrovolskiy, University of Vienna An international team of scientists from Austria, Germany, and Ukraine has found a new superconducting system in which magnetic flux quanta can move at velocities of 10 to 15…
“#’Ironing’ out the differences: Understanding superconductivity in ultrathin FeSe” The results show that resistivity begins to decrease sharply at temperatures below 40 K regardless of the thickness of the FeSe layer. This means that two-dimensional superconductivity in FeSe/STO occurs at the interface rather than across all FeSe layers. ρ2D: two-dimensional resistivity, UC: unit-cell thickness. Credit:…
“#Cascade sets the stage for superconductivity in magic-angle twisted bilayer graphene” Seen from above, the magic-angle bilayer graphene resembles a pattern known as moiré for its resemblance to a French fabric. Credit: Yazdani lab at Princeton University. Place a single sheet of carbon atop another at a slight angle and remarkable properties emerge, including the…