Van-der-Waals integration of tunneling devices

David Wang Auditorium, 3rd floor Dalia Maydan Bldg.
Dr. Hadar Steinberg

Dr. Hadar Steinberg

Racah Institute of Physics, Hebrew University, JerusalemKaplun 15, Givat Ram Safra Campus, Jerusalem 91904 ,

Layered materials, such as graphite, can be exfoliated to very thin films. In our group we utilize a technique called “mechanical transfer”, which allows stacking of such materials into new types of heterostructures which can involve layers of distinct functionalities. In my talk I will describe this fabrication technique, and demonstrate how we build a new type of device which consists of a layered superconductor (NbSe2), on which we deposit an ultra-thin insulating layer. Together, these two materials form a tunneling device, which we can use to probe the fundamental properties of the superconductor. Crucially, this device can be cooled to extremely low temperatures (20 mK) in a dilution cryostat fitted with special filters which allow very sensitive energy spectroscopy. Our tunneling spectra allow tracking the evolution of the superconductor order parameter at the presence of strong magnetic fields, and quantifying its stability. I will discuss how this technique can be applied for a range of new measurements.

Host : Yachin Ivry