Research Status We recently introduced nanometer resolution Scanned Josephson Tunneling Microscopy (SJTM), a technique allowing imaging of Cooper-pair tunneling from a superconducting STM tip to the Cooper-pair condensate of a superconductor. The SJTM operates at millikelvin temperatures and sequentially forms an array of 65,500 nanoscale Josephson junctions, whose Josephson critical current Ic is then measured to form the condensate image (Nature 532, 343 (2016)). For the first time in superconductivity research, one can visualize the Cooper-pair condensate itself. Fig. 1 A) Josephson critical current Ic(r) images with atomic-resolution in 75nmX75nm FOV; B) Fourier transform of A shows the existence of 4a0-periodic modulations of Cooper-pair density due to the PDW state; C) Schematic representation of a biaxial d-symmetry PDW. |
Research Plans SJTM is a very promising new approach to research into all kinds of heterogeneous superconductivity. Projects of immediate research interest include: |