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  Vanadyl phthalocyanines on graphene/SiC(0001): toward a hybrid architecture for molecular spin qubits

Cimatti, I., Bondì, L., Serrano, G., Malavolti, L., Cortigiani, B., Velez-Fort, E., et al. (2019). Vanadyl phthalocyanines on graphene/SiC(0001): toward a hybrid architecture for molecular spin qubits. Nanoscale Horizons, 4(5), 1202-1210. doi:10.1039/c9nh00023b.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-A662-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-A663-1
Genre: Journal Article

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https://dx.doi.org/10.1039/c9nh00023b (Publisher version)
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 Creators:
Cimatti, I.1, Author
Bondì, L.1, Author
Serrano, G.2, Author
Malavolti, L.3, 4, Author              
Cortigiani, B.1, Author
Velez-Fort, E.5, Author
Betto, D.5, Author
Ouerghi, A.6, Author
Brookes, N. B.5, Author
Loth, S.3, 4, 7, Author              
Mannini, M.1, Author
Totti, F.1, Author
Sessolia, R.1, Author
Affiliations:
1Department of Chemistry “Ugo Schiff” and INSTM RU of Florence, University of Florence, ou_persistent22              
2Department of Industrial Engineering (DIEF) and INSTM RU of Florence, University of Florence, ou_persistent22              
3Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938290              
4Max-Planck Institute for Solid State Research, ou_persistent22              
5European Synchrotron Radiation Facility, ou_persistent22              
6Centre de Nanosciences et de Nanotechnologies (C2N), CNRS, Univ Paris Sud, ou_persistent22              
7Institute for Functional Matter and Quantum Technologies, University of Stuttgart, ou_persistent22              

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 Abstract: Vanadyl phthalocyanine (VOPc) contains a highly coherent spin S = ½, which is of interest for applications in quantum information. Preservation of long coherence times upon deposition on conductive materials is crucial for use of single-spin in devices. Here, we report a detailed investigation of the structural, electronic and magnetic properties of a hybrid architecture constituted by a monolayer film of VOPc molecules deposited on graphene/SiC(0001). Graphene (Gr) is a two-dimensional conductor with exceptional chemical stability, a property which we exploited here to preserve the spin of VOPc. Low temperature-scanning tunneling microscopy supported by density functional theory (DFT) simulations revealed that VOPc molecules were adsorbed intact on the Gr/SiC(0001) surface in a planar geometry assuming a unique configuration in which the vanadyl group is projected out toward the vacuum, different to that found commonly on other conductive surfaces. Furthermore, X-ray photoelectron spectroscopy and UV-photoelectron spectroscopy (flanked theoretically by DFT) showed that VOPc interact weakly with the Gr/SiC(0001) substrate to preserve its electronic configuration with the unpaired electron located on the V ion. These findings were confirmed by X-ray magnetic circular dichroism, revealing that the S = ½ character of the VOPc assembly on Gr/SiC(0001) was preserved, in agreement with the theoretical prediction. Hence, molecules could be adsorbed and used as qubits on substrates of technological importance, such as graphene. This new hybrid architecture could be employed for local investigation of static and dynamic spin properties and as molecular qubits for spintronic applications.

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Language(s): eng - English
 Dates: 2019-01-132019-05-102019-06-072019-09-01
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c9nh00023b
 Degree: -

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Project name : Financial support from the Italian MIUR through PRIN 2015 HYFSRT project, from European QuantERA through the SUMO project, and from Fondazione CR Firenze is acknowledged. The research leading to these results received funding from the European Research Council (ERC-2014-StG-633818-dasQ). The experiments were carried out at the ID32 beamline of the European Synchrotron Radiation Facility synchrotron, Grenoble, France. We acknowledge the COST action for funding the Short-Term Scientific Mission (COST-STSM-CA15128-34550).
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Title: Nanoscale Horizons
  Abbreviation : Nanoscale Horiz.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: - Volume / Issue: 4 (5) Sequence Number: - Start / End Page: 1202 - 1210 Identifier: ISSN: 2055-6756
CoNE: https://pure.mpg.de/cone/journals/resource/2055-6756