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Title: Anomalous Kondo resonance mediated by semiconducting graphene nanoribbons in a molecular heterostructure

An unusually large spin-coupling of almost 100% is found in vertically stacked molecular hetrostructures composed of cobalt-porphyrin based magnetic molecules adsorbed on semiconducting armchair graphene nanoribbon on a Au(111) surface. Although the graphene nanoribbons are electronically decoupled from the gold substrate due to their band gaps and weak adsorption, they enable spin coupling between the magnetic moment of the molecule and the electrons from the substrate exhibiting a Kondo resonance. Surprisingly, the Kondo temperatures corresponding to three adsorption sites of the molecules on Au(111) surface are reproduced on the molecules adsorb on the graphene nanoribbons although the molecules are located 7.5 Å away from the surface. This finding suggests that the molecules on graphene nanoribbons experience almost the same environment for spin-electron interactions as the ones directly adsorb on Au(111). This puzzling effect is further confirmed by density functional theory calculations that reveal no spin electron interactions if the molecule is left at the same height from the Au(111) surface without the graphene nanoribbon in between.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [1] ;  [2] ;  [4] ;  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials, Nanoscience and Technology Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials, Nanoscience and Technology Division; Ohio Univ., Athens, OH (United States). Nanoscale & Quantum Phenomena Inst., Dept. of Physics & Astronomy
  4. Ohio Univ., Athens, OH (United States). Nanoscale & Quantum Phenomena Inst., Dept. of Physics & Astronomy
Publication Date:
Grant/Contract Number:
AC02-06CH11357; FG02‐02ER46012; 1508325
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; Molecular electronics; Electronic properties and devices
OSTI Identifier:
1423336

Li, Yang, Ngo, Anh T., DiLullo, Andrew, Latt, Kyaw Zin, Kersell, Heath, Fisher, Brandon, Zapol, Peter, Ulloa, Sergio E., and Hla, Saw-Wai. Anomalous Kondo resonance mediated by semiconducting graphene nanoribbons in a molecular heterostructure. United States: N. p., Web. doi:10.1038/s41467-017-00881-1.
Li, Yang, Ngo, Anh T., DiLullo, Andrew, Latt, Kyaw Zin, Kersell, Heath, Fisher, Brandon, Zapol, Peter, Ulloa, Sergio E., & Hla, Saw-Wai. Anomalous Kondo resonance mediated by semiconducting graphene nanoribbons in a molecular heterostructure. United States. doi:10.1038/s41467-017-00881-1.
Li, Yang, Ngo, Anh T., DiLullo, Andrew, Latt, Kyaw Zin, Kersell, Heath, Fisher, Brandon, Zapol, Peter, Ulloa, Sergio E., and Hla, Saw-Wai. 2017. "Anomalous Kondo resonance mediated by semiconducting graphene nanoribbons in a molecular heterostructure". United States. doi:10.1038/s41467-017-00881-1. https://www.osti.gov/servlets/purl/1423336.
@article{osti_1423336,
title = {Anomalous Kondo resonance mediated by semiconducting graphene nanoribbons in a molecular heterostructure},
author = {Li, Yang and Ngo, Anh T. and DiLullo, Andrew and Latt, Kyaw Zin and Kersell, Heath and Fisher, Brandon and Zapol, Peter and Ulloa, Sergio E. and Hla, Saw-Wai},
abstractNote = {An unusually large spin-coupling of almost 100% is found in vertically stacked molecular hetrostructures composed of cobalt-porphyrin based magnetic molecules adsorbed on semiconducting armchair graphene nanoribbon on a Au(111) surface. Although the graphene nanoribbons are electronically decoupled from the gold substrate due to their band gaps and weak adsorption, they enable spin coupling between the magnetic moment of the molecule and the electrons from the substrate exhibiting a Kondo resonance. Surprisingly, the Kondo temperatures corresponding to three adsorption sites of the molecules on Au(111) surface are reproduced on the molecules adsorb on the graphene nanoribbons although the molecules are located 7.5 Å away from the surface. This finding suggests that the molecules on graphene nanoribbons experience almost the same environment for spin-electron interactions as the ones directly adsorb on Au(111). This puzzling effect is further confirmed by density functional theory calculations that reveal no spin electron interactions if the molecule is left at the same height from the Au(111) surface without the graphene nanoribbon in between.},
doi = {10.1038/s41467-017-00881-1},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {10}
}

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