NYU Arts & Science

Center for Quantum Information Physics Seminars

May 23, 2024 Thursday 11:00 AM  +
726 Broadway, Room 1067
Center for Quantum Information Physics Seminars (cqip)


Jia Leo Li
Brown University

Broken Symmetries and Superconducting Diode Effect in Multi-Layer Graphene

The superconducting diode effect is defined by nonreciprocity in the critical supercurrent, which has been attributed to the presence of finite-momentum Cooper pairs. In this talk, I discuss our recent observation of superconducting diode effect under zero magnetic field in multilayer graphene heterostructures. Transport nonreciprocity in and of itself must exhibit an angular dependence with varying azimuth direction of current flow. The broken symmetries associated with the diode effect are naturally encoded into properties of this angular dependence. To unravel such information, we utilize the angle-resolved measurement to extract the conductivity tensor that describes transport properties in both the linear and nonlinear channels. By investigating the interplay between transport nonreciprocity, ferromagnetism, and superconductivity, our findings suggest that the exchange-driven instability in the momentum space plays a key role in stabilizing the zero-field superconducting diode effect.


July 18, 2024 Thursday 11:00 AM  +
726 Broadway, Room 1067
Center for Quantum Information Physics Seminars (cqip)


Axel LeBlanc
CEA Grenoble Center

TBA