Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: 2D materials beyond graphene: TMDCs, silicene and relatives I

O 36.2: Talk

Tuesday, March 13, 2018, 14:15–14:30, MA 043

An electrically controlled single atom magnetic switch on black phosphorus — •Brian Kiraly, Werner v. Weerdenburg, Alexander N. Rudenko, Mikhail I. Katsnelson, and Alexander A. Khajetoorians — Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands

Single atoms at the surfaces of solids have demonstrated rich electronic, chemical, and magnetic properties. In this direction, we demonstrate that we can manipulate the orbital population of a single cobalt atom on a crystalline black phosphorus surface. Using the local electric field generated from an STM tip, individual cobalt atoms residing at the same hollow site can be reversibly switched between two stable states, which correspond to the different orbital configurations. The experimentally observed charge density of each configuration is corroborated with density functional theory calculations, which reveal the total magnetic moment and relaxation of the cobalt atom, as well as the electronic properties of the cobalt atom which locally dopes the black phosphorus. Utilizing tip-induced band bending, we further study the screening behavior of each Co atom configuration. We investigate the stability of each configuration, as well as compare the experimentally measured impurity states with DFT calculations. This system provides a new perspective on the horizon for fundamental properties of single atoms on surfaces.