Spintronics with two-dimensional materials
Dr Ahmet Avsar is an experimental condensed matter physicist specializing in the emerging fields of spintronics and two-dimensional crystals-based nanotechnology. Specifically, he studies the electron and spin transport in lithographically patterned mesoscopic devices. These devices utilize van der Waals bonded two-dimensional crystals such as graphene, black phosphorus, transition metal dichalcogenides and boron nitride. He obtained PhD degree from Physics Department of National University of Singapore and he is currently a research fellow at the Electrical Engineering Department of Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland. He is a recipient of 2016- EPFL Fellows fellowship award co-fund by Marie Skladowska-Curie.
Exploitation of the intrinsic spin of an electron, spintronics, could facilitate the development of multifunctional and novel devices. With respect to the material selection, two-dimensional (2D) crystals and their van der Waals heterostructures could enable new spintronics functionalities that are not accessible in bulk materials . Towards building such van der Waals-bonded spin devices, spin transport and magnetic properties of novel 2D materials have been individually studied. In this talk, I will first introduce ultra-thin, semiconducting black phosphorus as a promising material for possible spintronics applications requiring rectification and amplification actions . It exhibits remarkable spin transport properties even at room temperature after an in-situ h-BN encapsulation process. Then, I will demonstrate inducing magnetism into an otherwise non-magnetic 2D material with the creation of some specific types of defects . Because of RKKY exchange couplings across ultra-thin films of this air-stable material, we also observe layer-dependent magnetism. Finally, I will provide an outlook about the tremendous potential of 2D materials for fundamental spintronics research and the future applications in information storage and logic devices.