John Wei’s research is devoted to nanoscale studies of unconventional superconducting and magnetic materials.
He examines the electronic properties of these materials at very short length scales, where the quantum ordering effects occur coherently without being averaged out over macroscopic distances, and manifest themselves as novel phenomena. This involves a unique combination of cryomagnetic, nanoprobe and nanofabrication techniques, with the application of both ‘top-down’ and ‘bottom-up’ approaches. Detailed understanding of these unconventional materials is of fundamental importance to condensed matter physics, and could also lend itself to novel technological applications, ranging from superconducting to spintronic devices, as well as elements for quantum computation. Wei has been interested in the unconventional superconductivity and magnetism that occur in several families of novel electronic materials. These include the high-Tc copper oxides, the heavy-fermion intermetallic compounds and the half-metallic transition-metal oxides.
Zhang, H. et al. "Attenuation of superconductivity in manganite/cuprate thin-film heterostructures by epitaxially induced CuO intergrowths." Applied Physics Letters 103 (2013): 052606.