Ruotong Yin

Abstract UTe2 is a candidate spin-triplet superconductor, yet its superconducting state remains debated. Using scanning tunneling microscopy/spectroscopy, we observe a novel magnetic vortex with distinct dark-bright contrast in local density of states on UTe2 (011) surface under perpendicular magnetic fields, resembling the Yin-Yang diagram in Taoism. Each vortex carries a quantized magnetic flux, and the boundary between the two parts aligns with crystallographic a-axis.

Abstract The hybrid ferromagnet-superconductor heterostructures have attracted extensive attention as they potentially host topological superconductivity. Relevant experimental signatures have recently been reported in CrBr3/NbSe2 ferromagnet-superconductor heterostructure, but controversies remain. Here, we reinvestigate CrBr3/NbSe2 by an ultralow temperature scanning tunneling microscope with higher spatial and energy resolutions.

The barrier structure has been designed to enhance the operating temperature of the infrared detector, thereby improving the efficiency of collecting photogenerated carriers and reducing dark current generation, without suppressing the photocurrent. However, the development of barrier detectors using conventional materials is limited due to the strict requirements for lattice and band matching.