Site- and Orbital-dependent Charge Donation and Spin Manipulation in Electron-doped Metal Phthalocyanines

Overview

Journal Nat Mater

Date 2013 Jan 22

PMID 23334000

Citations 6

Authors

Cornelius Krull

Roberto Robles

Aitor Mugarza

Pietro Gambardella

Affiliations

Soon will be listed here.

Abstract

Chemical doping offers promise as a means of tailoring the electrical characteristics of organic molecular compounds. However, unlike for inorganic semiconductors used in electronics applications, controlling the influence of dopants in molecular complexes is complicated by the presence of multiple doping sites, electron acceptor levels, and intramolecular correlation effects. Here we use scanning tunnelling microscopy to analyse the position of individual Li dopants within Cu- and Ni-phthalocyanine molecules in contact with a metal substrate, and probe the charge transfer process with unprecedented spatial resolution. We show that individual phthalocyanine molecules can host at least three distinct stable doping sites and up to six dopant atoms, and that the ligand and metal orbitals can be selectively charged by modifying the configuration of the Li complexes. Li manipulation reveals that charge transfer is determined solely by dopants embedded in the molecules, whereas the magnitude of the conductance gap is sensitive to the molecule-dopant separation. As a result of the strong spin-charge correlation in confined molecular orbitals, alkali atoms provide an effective way for tuning the molecular spin without resorting to magnetic dopants.

Citing Articles

Room-Temperature On-Spin-Switching and Tuning in a Porphyrin-Based Multifunctional Interface.

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Tunable giant magnetoresistance in a single-molecule junction.

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Real space manifestations of coherent screening in atomic scale Kondo lattices.

Moro-Lagares M, Korytar R, Piantek M, Robles R, Lorente N, Pascual J Nat Commun. 2019; 10(1):2211.

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Spin doping using transition metal phthalocyanine molecules.

Atxabal A, Ribeiro M, Parui S, Urreta L, Sagasta E, Sun X Nat Commun. 2016; 7:13751.

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Electron Paramagnetic Resonance of Single Magnetic Moment on a Surface.

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