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Ilgaz Aysan I, Gorkan T, Ozdemir I, Kadioglu Y, Gökoğlu G, Aktürk E. Electronic structure, cohesive and magnetic properties of iridium oxide clusters adsorbed on graphene. J Mol Graph Model 2020; 101:107726. [PMID: 32920238 DOI: 10.1016/j.jmgm.2020.107726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/30/2020] [Accepted: 08/24/2020] [Indexed: 10/23/2022]
Abstract
In this study, we investigated and revealed the electronic properties, geometric structures and binding behavior of small (IrO)n and [Formula: see text] (n = 1-5) clusters within first principles calculations based on the density functional theory. The electronic and magnetic properties of small nanoclusters displayed significant size dependency due to strong quantum confinement effect. Moreover we considered the binding and structural modification of the clusters on graphene surface as a substrate. The cohesive energy per atom of isolated clusters increased with size of the cluster n. This shows that the increase in coordination number results in a more stable nanocluster with increased number of saturated bonds. Pristine (IrO)n and [Formula: see text] clusters presented different structural motives at equilibrium. The ground states of (IrO)n and [Formula: see text] clusters considered in this study were all magnetic except for (IrO)4, [Formula: see text] , and [Formula: see text] . HOMO-LUMO gap EHLG values displayed large variations due to size of the cluster, hence bond saturation. The structural configurations of free standing nanoclusters are slightly modified, when adsorbed on graphene. The adsorption behavior of a cluster on graphene was improved by an applied electric field yielding larger binding energy and larger charger transfer. We observed that electronic and magnetic ground state of the clusters strongly depend on optimized structural configuration for both bare and adsorbed on graphene monolayer.
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Affiliation(s)
- Isil Ilgaz Aysan
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey
| | - Taylan Gorkan
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey
| | - Ilkay Ozdemir
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey
| | - Yelda Kadioglu
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey
| | - Gökhan Gökoğlu
- Department of Mechatronics Engineering, Faculty of Engineering, Karabuk University, 78050, Karabuk, Turkey
| | - Ethem Aktürk
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey; Nanotechnology Application and Research Center, Adnan Menderes University, 09100, Aydin, Turkey.
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Hu FM, Kou L, Frauenheim T. Controllable magnetic correlation between two impurities by spin-orbit coupling in graphene. Sci Rep 2015; 5:8943. [PMID: 25754911 PMCID: PMC4354095 DOI: 10.1038/srep08943] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 02/06/2015] [Indexed: 12/05/2022] Open
Abstract
Two magnetic impurities on the edge of a zigzag graphene nanoribbon strongly interact with each other via indirect coupling, which can be mediated by conducting carriers. By means of Quantum Monte Carlo (QMC) simulations, we find that the spin-orbit coupling λ and the chemical potential μ in system can be used to drive the transition of local-spin exchange from ferromagnetism to anti-ferromagnetism. Since the tunable ranges for λ and μ in graphene are experimentally reachable, we thus open the possibilities for its device application. The symmetry in spatial distribution is broken by the vertical and the transversal spin-spin correlations due to the effect of spin-orbit coupling, leading to the spatial anisotropy of spin exchange, which distinguish our findings from the case in normal Fermi liquid.
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Affiliation(s)
- F M Hu
- Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1a, D-28359 Bremen, Germany
| | - Liangzhi Kou
- Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1a, D-28359 Bremen, Germany
| | - Thomas Frauenheim
- Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1a, D-28359 Bremen, Germany
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Eremeev SV, Nechaev IA, Echenique PM, Chulkov EV. Spin-helical Dirac states in graphene induced by polar-substrate surfaces with giant spin-orbit interaction: a new platform for spintronics. Sci Rep 2014; 4:6900. [PMID: 25365945 PMCID: PMC4219157 DOI: 10.1038/srep06900] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Accepted: 10/06/2014] [Indexed: 11/26/2022] Open
Abstract
Spintronics, or spin electronics, is aimed at efficient control and manipulation of spin degrees of freedom in electron systems. To comply with demands of nowaday spintronics, the studies of electron systems hosting giant spin-orbit-split electron states have become one of the most important problems providing us with a basis for desirable spintronics devices. In construction of such devices, it is also tempting to involve graphene, which has attracted great attention because of its unique and remarkable electronic properties and was recognized as a viable replacement for silicon in electronics. In this case, a challenging goal is to lift spin degeneracy of graphene Dirac states. Here, we propose a novel pathway to achieve this goal by means of coupling of graphene and polar-substrate surface states with giant Rashba-type spin-splitting. We theoretically demonstrate it by constructing the graphene@BiTeCl system, which appears to possess spin-helical graphene Dirac states caused by the strong interaction of Dirac and Rashba electrons. We anticipate that our findings will stimulate rapid growth in theoretical and experimental investigations of graphene Dirac states with real spin-momentum locking, which can revolutionize the graphene spintronics and become a reliable base for prospective spintronics applications.
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Affiliation(s)
- S. V. Eremeev
- Institute of Strength Physics and Materials Science, 634021 Tomsk, Russia
- Tomsk State University, 634050 Tomsk, Russia
- Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain
| | - I. A. Nechaev
- Tomsk State University, 634050 Tomsk, Russia
- Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain
| | - P. M. Echenique
- Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain
- Departamento de Física de Materiales UPV/EHU, Facultad de Ciencias Químicas, UPV/EHU, Apdo. 1072, 20080 Sebastián/Donostia, Basque Country, Spain
- Centro de Física de Materiales CFM - MPC, Centro Mixto CSIC-UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain
| | - E. V. Chulkov
- Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain
- Departamento de Física de Materiales UPV/EHU, Facultad de Ciencias Químicas, UPV/EHU, Apdo. 1072, 20080 Sebastián/Donostia, Basque Country, Spain
- Centro de Física de Materiales CFM - MPC, Centro Mixto CSIC-UPV/EHU, 20080 San Sebastián/Donostia, Basque Country, Spain
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