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Castrillo-Bodero R, Blanco-Rey M, Ali K, Ortega JE, Schiller F, Fernández L. Tuning the carrier injection barrier of hybrid metal-organic interfaces on rare earth-gold surface compounds. NANOSCALE 2023; 15:4090-4100. [PMID: 36744853 DOI: 10.1039/d2nr06440e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Magnetic hybrid metal-organic interfaces possess a great potential in areas such as organic spintronics and quantum information processing. However, tuning their carrier injection barriers on-demand is fundamental for the implementation in technological devices. We have prepared hybrid metal-organic interfaces by the adsorption of copper phthalocyanine CuPc on REAu2 surfaces (RE = Gd, Ho and Yb) and studied their growth, electrostatics and electronic structure. CuPc exhibits a long-range commensurability and a vacuum level pinning of the molecular energy levels. We observe a significant effect of the RE valence of the substrate on the carrier injection barrier of the hybrid metal-organic interface. CuPc adsorbed on trivalent RE-based surfaces (HoAu2 and GdAu2) exhibits molecular level energies that may allow injection carriers significantly closer to an ambipolar injection behavior than in the divalent case (YbAu2).
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Affiliation(s)
- R Castrillo-Bodero
- Centro de Física de Materiales CSIC-UPV/EHU-Materials Physics Center, 20018 San Sebastián, Spain.
| | - M Blanco-Rey
- Universidad del País Vasco UPV/EHU, Dpto. de Polímeros y Materiales Avanzados: Física, Química y Tecnología, 20018 San Sebastián, Spain
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain
| | - K Ali
- Centro de Física de Materiales CSIC-UPV/EHU-Materials Physics Center, 20018 San Sebastián, Spain.
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain
- Chalmers University of Technology, Chalmersplatsen 4, Götenborg, 41296, Sweden
| | - J E Ortega
- Universidad del País Vasco UPV/EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC-UPV/EHU-Materials Physics Center, 20018 San Sebastián, Spain.
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain
| | - F Schiller
- Centro de Física de Materiales CSIC-UPV/EHU-Materials Physics Center, 20018 San Sebastián, Spain.
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain
| | - L Fernández
- Centro de Física de Materiales CSIC-UPV/EHU-Materials Physics Center, 20018 San Sebastián, Spain.
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Ma XY, Lyu HY, Hao KR, Zhu ZG, Yan QB, Su G. High-efficient ab initio Bayesian active learning method and applications in prediction of two-dimensional functional materials. NANOSCALE 2021; 13:14694-14704. [PMID: 34533170 DOI: 10.1039/d1nr03886a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Beyond the conventional trial-and-error method, machine learning offers a great opportunity to accelerate the discovery of functional materials, but still often suffers from difficulties such as limited materials data and the unbalanced distribution of target properties. Here, we propose the ab initio Bayesian active learning method that combines active learning and high-throughput ab initio calculations to accelerate the prediction of desired functional materials with ultrahigh efficiency and accuracy. We apply it as an instance to a large family (3119) of two-dimensional hexagonal binary compounds with unbalanced materials properties, and accurately screen out the materials with maximal electric polarization and proper photovoltaic band gaps, respectively, whereas the computational costs are significantly reduced by only calculating a few tenths of the possible candidates in comparison with a random search. This approach shows the enormous advantages for the cases with unbalanced distribution of target properties. It can be readily applied to seek a broad range of advanced materials.
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Affiliation(s)
- Xing-Yu Ma
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Hou-Yi Lyu
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
- Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Kuan-Rong Hao
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Zhen-Gang Zhu
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qing-Bo Yan
- Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Gang Su
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
- Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
- Kavli Institute for Theoretical Sciences, and CAS Center of Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
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Liu J, Li J, Xu Z, Zhou X, Xue Q, Wu T, Zhong M, Li R, Sun R, Shen Z, Tang H, Gao S, Wang B, Hou S, Wang Y. On-surface preparation of coordinated lanthanide-transition-metal clusters. Nat Commun 2021; 12:1619. [PMID: 33712614 PMCID: PMC7954866 DOI: 10.1038/s41467-021-21911-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 02/19/2021] [Indexed: 11/25/2022] Open
Abstract
The study of lanthanide (Ln)-transition-metal (TM) heterometallic clusters which play key roles in various high-tech applications is a rapid growing field of research. Despite the achievement of numerous Ln-TM cluster compounds comprising one Ln atom, the synthesis of Ln-TM clusters containing multiple Ln atoms remains challenging. Here, we present the preparation and self-assembly of a series of Au-bridged heterometallic clusters containing multiple cerium (Ce) atoms via on-surface coordination. By employing different pyridine and nitrile ligands, the ordered coordination assemblies of clusters containing 2, 3 and 4 Ce atoms bridged by Au adatoms are achieved on Au(111) and Au(100), as revealed by scanning tunneling microscopy. Density functional theory calculations uncover the indispensable role of the bridging Au adatoms in constructing the multi-Ce-containing clusters by connecting the Ce atoms via unsupported Ce-Au bonds. These findings demonstrate on-surface coordination as an efficient strategy for preparation and organization of the multi-Ln-containing heterometallic clusters.
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Affiliation(s)
- Jing Liu
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
- Division of Quantum State of Matter, Beijing Academy of Quantum Information Sciences, Beijing, China
| | - Jie Li
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
- Peking University Information Technology Institute (Tianjin Binhai), Tianjin, China
| | - Zhen Xu
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
| | - Xiong Zhou
- Beijing National Laboratory of Molecular Science, College of Chemistry and Molecular Engineering, Peking University, Beijing, China
| | - Qiang Xue
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
| | - Tianhao Wu
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
| | - Mingjun Zhong
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
| | - Ruoning Li
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
| | - Rong Sun
- Beijing National Laboratory of Molecular Science, College of Chemistry and Molecular Engineering, Peking University, Beijing, China
| | - Ziyong Shen
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
| | - Hao Tang
- CEMES, UPR CNRS 8011, Toulouse Cedex 4, France
| | - Song Gao
- Division of Quantum State of Matter, Beijing Academy of Quantum Information Sciences, Beijing, China
- Beijing National Laboratory of Molecular Science, College of Chemistry and Molecular Engineering, Peking University, Beijing, China
- Institute of Spin Science and Technology, South China University of Technology, Guangzhou, China
| | - Bingwu Wang
- Beijing National Laboratory of Molecular Science, College of Chemistry and Molecular Engineering, Peking University, Beijing, China
| | - Shimin Hou
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China
- Peking University Information Technology Institute (Tianjin Binhai), Tianjin, China
| | - Yongfeng Wang
- Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics, Department of Electronics, Peking University, Beijing, China.
- Division of Quantum State of Matter, Beijing Academy of Quantum Information Sciences, Beijing, China.
- Institute of Spin Science and Technology, South China University of Technology, Guangzhou, China.
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Fernandez L, Blanco-Rey M, Castrillo-Bodero R, Ilyn M, Ali K, Turco E, Corso M, Ormaza M, Gargiani P, Valbuena MA, Mugarza A, Moras P, Sheverdyaeva PM, Kundu AK, Jugovac M, Laubschat C, Ortega JE, Schiller F. Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds. NANOSCALE 2020; 12:22258-22267. [PMID: 33146198 DOI: 10.1039/d0nr04964f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
One-atom-thick rare-earth/noble metal (RE-NM) compounds are attractive materials to investigate two-dimensional magnetism, since they are easy to synthesize into a common RE-NM2 structure with high crystal perfection. Here we perform a comparative study of the GdAu2, HoAu2, and YbAu2 monolayer compounds grown on Au(111). We find the same atomic lattice quality and moiré superlattice periodicity in the three cases, but different electronic properties and magnetism. The YbAu2 monolayer reveals the characteristic electronic signatures of a mixed-valence configuration in the Yb atom. In contrast, GdAu2 and HoAu2 show the trivalent character of the rare-earth and ferromagnetic transitions below 22 K. Yet, the GdAu2 monolayer has an in-plane magnetic easy-axis, versus the out-of-plane one in HoAu2. The electronic bands of the two trivalent compounds are very similar, while the divalent YbAu2 monolayer exhibits different band features. In the latter, a strong 4f-5d hybridization is manifested in neatly resolved avoided crossings near the Fermi level. First principles theory points to a residual presence of empty 4f states, explaining the fluctuating valence of Yb in the YbAu2 monolayer.
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Affiliation(s)
- L Fernandez
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Blanco-Rey
- Universidad del País Vasco UPV-EHU, Dpto. de Polímeros y Materiales Avanzados: Física, Química y Tecnología, 20018 San Sebastián, Spain
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
| | - R Castrillo-Bodero
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ilyn
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - K Ali
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - E Turco
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Corso
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ormaza
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
| | - P Gargiani
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, 08290 Cerdanyola del Vallès, Spain
| | - M A Valbuena
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- IMDEA Nanociencia, 28049 Madrid, Spain
| | - A Mugarza
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08070 Barcelona, Spain
| | - P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - P M Sheverdyaeva
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - Asish K Kundu
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - M Jugovac
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - C Laubschat
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany
| | - J E Ortega
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - F Schiller
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
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Que Y, Liu B, Zhuang Y, Xu C, Wang K, Xiao X. On-Surface Synthesis of Graphene Nanoribbons on Two-Dimensional Rare Earth-Gold Intermetallic Compounds. J Phys Chem Lett 2020; 11:5044-5050. [PMID: 32510955 DOI: 10.1021/acs.jpclett.0c01398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Here, we demonstrate two reliable routes for the fabrication of armchair-edge graphene nanoribbons (GNRs) on TbAu2/Au(111), belonging to a class of two-dimensional ferromagnetic rare earth-gold intermetallic compounds. On-surface synthesis directly on TbAu2 leads to the formation of GNRs, which are short and interconnected with each other. In contrast, the intercalation approach-on-surface synthesis of GNRs directly on Au(111) followed by rare earth intercalation-yields GNRs on TbAu2/Au(111), where both the ribbons and TbAu2 are of high quality comparable with those directly grown on clean Au(111). Besides, the as-grown ribbons retain the same band gap while changing from p-doping to weak n-doping mainly due to a change in the work function of the substrate after the rare earth intercalation. The intercalation approach might also be employed to fabricate other types of GNRs on various rare earth intermetallic compounds, providing platforms to tailor the electronic and magnetic properties of GNRs on magnetic substrates.
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Affiliation(s)
- Yande Que
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, P. R. China
| | - Bin Liu
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, P. R. China
| | - Yuan Zhuang
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, P. R. China
| | - Chaoqiang Xu
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, P. R. China
| | - Kedong Wang
- Department of Physics, Southern University of Science and Technology, Shenzhen, Guangdong 518055, P. R. China
| | - Xudong Xiao
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, P. R. China
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