SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 81: Poster Session VI: Poster to Mini-Symposium: Manipulation and control of spins on functional surfaces II

O 81.1: Poster

Mittwoch, 3. März 2021, 13:30–15:30, P

Spin polarization of quantum confined surfaces states of 2D metal-organic network structures — •Lu Lyu, Tobias Eul, Wei Yao, Benito Arnoldi, Benjamin Stadtmüller, and Martin Aeschlimann — Department of Physics, TU Kaiserslautern, Germany

Controlling the quantum confinement of spin-dependent electronic states by design of two-dimensional (2D) metal-organic networks (MON) opens a unique avenue to accelerate the implementation of quantum technology into the next generation of spintronic applications. In our work, we focus on the quantum confinement of occupied Shockley surface states (SS) and unoccupied image potential states (IPS) of noble metal (111) surfaces by the formation of 2D metal-organic networks. Both surface states are well-known quasi-free 2D electron gases (2DEGs) with a Rashba spin-orbit splitting. For the exemplary case of the Cu-T4PT network on Cu(111) surface, we investigate the trapping of the 2DEG into a 2D quantum dot system using spin- and momentum-resolved photoemission. We reveal that the dispersion free electron-like surface states transform into periodic bands in momentum space. The details of the band structure depend critically on the intercoupling between electrons trapped in neighboring pores. In addition, we demonstrate that the mixing of molecular and metallic states reduces the magnitude of the spin-splitting of confined SS and IPS due to the strongly reduced spin-orbit coupling strength of the molecular materials. Our works open up a new avenue towards manipulating the spin-dependent trapping of electrons in metal-organic network structures.