A Molecular Approach for Engineering Interfacial Interactions in Magnetic-Topological Insulator Heterostructures

Abstract

Controlling interfacial interactions in magnetic/topological insulator heterostructures is a major challenge for the emergence of novel spin-dependent electronic phenomena. As for any rational design of heterostructures that rely on proximity effects, one should ideally retain the overall properties of each component while tuning interactions at the interface. However, in most inorganic interfaces interactions are too strong, consequently perturbing, and even quenching, both the magnetic moment and the topological surface states at each side of the interface. Here we show that these properties can be preserved by using ligand chemistry to tune the interaction of magnetic ions with the surface states. By depositing Co-based porphyrin and phthalocyanine monolayers on the surface of Bi${}_2$Te${}_3$ thin films, robust interfaces are formed that preserve undoped topological surface states as well as the pristine magnetic moment of the divalent Co ions. The selected ligands allow us to tune the interfacial hybridization within this weak interaction regime. These results, which are in stark contrast with the observed suppression of the surface state at the first quintuple layer of Bi${}_2$Se${}_3$ induced by the interaction with Co phthalocyanines, demonstrate the capability of planar metal-organic molecules to span interactions from the strong to the weak limit.

References in corpus (20)

• Topological Insulators
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
• Fermi level dependent charge-to-spin current conversion by Dirac surface state of topological insulators
• Spin-pumping into surface states of topological insulator α-Sn, spin to charge conversion at room temperature
• Electronic and magnetic properties of molecule-metal interfaces: transition metal phthalocyanines adsorbed on Ag(100)
• Manipulating Kondo Temperature via Single Molecule Switching
• Tolerance of topological surface states towards magnetic moments: Fe on Bi2Te3 and Bi2Se3
• In-plane magnetic anisotropy of Fe atoms on Bi${}_2$Se${}_3$(111)
• Localized Magnetic States of Fe, Co, and Ni Impurities on Alkali Metal Films
• Cobalt-Porphyrin Catalyzed Electrochemical Reduction of Carbon Dioxide in Water II: Mechanism from First Principles
• Controllable magnetic doping of the surface state of a topological insulator
• Band structure and spin texture of Bi${}_2$Se${}_3$/3d ferromagnetic metal interface
• Magnetic proximity effect in the 3D topological insulator/ferromagnetic insulator heterostructure
• Fermi-Level Pinning, Charge Transfer, and Relaxation of Spin-Momentum Locking at Metal Contacts to Topological Insulators
• Systematics of molecular self-assembled networks at topological insulators surfaces
• Probing the Electronic Properties of Individual MnPc Molecules Coupled to Topological States
• Strong out-of-plane magnetic anisotropy of Fe adatoms on Bi${}_2$Te${}_3$
• Epitaxy and Structural Properties of (V,Bi,Sb)${}_2$Te${}_3$ Layers Exhibiting the Quantum Anomalous Hall Effect
• Angle-resolved and core-level photoemission study of interfacing the topological insulator Bi1.5Sb0.5Te1.7Se1.3 with Ag, Nb and Fe

Cited by in corpus (1)

• Experimental demonstration of a magnetically induced warping transition in a topological insulator mediated by rare-earth surface dopants