Competing Coulomb and electron-phonon interactions in NbS$_2$
| Autor: | E. G. C. P. van Loon, Tim O. Wehling, Malte Rösner, Mikhail I. Katsnelson, Gunnar Schönhoff |
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| Rok vydání: | 2017 |
| Předmět: |
Theory of Condensed Matter
FOS: Physical sciences 02 engineering and technology Electron Quantum phases lcsh:Atomic physics. Constitution and properties of matter 01 natural sciences Condensed Matter - Strongly Correlated Electrons 0103 physical sciences Monolayer Mesoscale and Nanoscale Physics (cond-mat.mes-hall) lcsh:TA401-492 Coulomb 010306 general physics Electronic band structure Quantum fluctuation Spin-½ Physics Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Materials Science (cond-mat.mtrl-sci) Charge (physics) 021001 nanoscience & nanotechnology Condensed Matter Physics lcsh:QC170-197 Electronic Optical and Magnetic Materials lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Npj Quantum Materials, 3, 1-8 npj Quantum Materials, Vol 3, Iss 1, Pp 1-8 (2018) Npj Quantum Materials, 3, pp. 1-8 npj Quantum Materials |
| ISSN: | 2397-4648 |
| DOI: | 10.48550/arxiv.1707.05640 |
| Popis: | The interplay of Coulomb and electron–phonon interactions with thermal and quantum fluctuations facilitates rich phase diagrams in two-dimensional electron systems. Layered transition metal dichalcogenides hosting charge, excitonic, spin and superconducting order form an epitomic material class in this respect. Theoretical studies of materials like NbS2 have focused on the electron–phonon coupling, whereas the Coulomb interaction, particularly strong in the monolayer limit, remained essentially untouched. Here, we analyze the interplay of short- and long-range Coulomb as well as electron–phonon interactions in NbS2 monolayers. The combination of these interactions causes electronic correlations that are fundamentally different to what would be expected from the interaction terms separately. The fully interacting electronic spectral function resembles the non-interacting band structure but with appreciable broadening. An unexpected coexistence of strong charge and spin fluctuations puts NbS2 close to spin and charge order, suggesting monolayer NbS2 as a platform for atomic scale engineering of electronic quantum phases. |
| Databáze: | OpenAIRE |
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