Van der Waals integration of superconducting tunneling devices

by Hadar Steinberg

at Condensed Matter Seminar

Mon, 13 Nov 2017, 11:30
Physics building (#54) room 207

Abstract

Layered materials 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 layer of the semiconductor WSe2 Together these two materials form a tunneling device which 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 Specifically the depairing energy scale can be evaluated and its origin orbital or spin identified Thus we are able to identify which of the two bands participating in NbSe2 superconductivity is associated with this material s remarkable stability against in plane magnetic field

Created on 06-11-2017 by Bar Lev, Yevgeny (ybarlev)
Updaded on 06-11-2017 by Bar Lev, Yevgeny (ybarlev)