Muhammad Nadeem, UOW
A superconducting diode enables supercurrent to flow in only one direction, providing new functionalities for superconducting circuits. In recent years, there has been experimental progress towards realizing such behaviour in both Josephson junctions, and in junction-free superconductors.
After reviewing the experimental work and theoretical developments, the observation of the superconducting diode effect including material realization, underlying symmetries, nature of spin-orbit interaction, band topology, device geometry, and experimentally measured parameters reflecting nonreciprocity is presented. The theoretical work and fundamental mechanisms that lead to non-reciprocal current are discussed through the lens of symmetry breaking. The impact of the interplay between various system parameters on the efficiency or the superconducting diode effect is highlighted.
Finally, a perspective is provided towards the future directions in this active research field through an analysis of electric field tunability and the intertwining between band-topology and superconductivity, and how this could be useful to steer the engineering of emergent topological superconducting technologies.
About the presenter
Dr Muhammad Nadeem is a Research Associate at University of Wollongong where he studies theory of 2D Chern/Z2 topological insulators with focus on Chern magnetism, role of various spin-orbit interactions, topological Skyrmion/Meron spin/pseudospin textures, and dissipationless transport.
Working with CIs Xiaolin Wang, Dimi Culcer, Alex Hamilton and Michael Fuhrer, his PhD project on exploring applications of 2D topological insulators for low-energy topological electronics and spintronics devices fits in FLEET’s Research theme 1, topological materials. He is also working on theoretical models for strongly correlated and unconventional topological phases, hosting quasiparticles with spin/pseudospin S > 1/2 and featured with multi-fold bulk band singularities, indebted to the broken Lorentz invariance in condensed matter systems.