Juntao Kong, Zhengxin Yan, Wei Song, Weili Li, Zhaoqi Wang
{"title":"Strong Quantized Electron–Phonon Coupling Induced by the Unique LA Phonon Mode in 2D Kramers Semimetal InTe","authors":"Juntao Kong, Zhengxin Yan, Wei Song, Weili Li, Zhaoqi Wang","doi":"10.1021/acs.jpcc.4c04708","DOIUrl":null,"url":null,"abstract":"Two-dimensional topological materials with flat bands and van Hove singularities in their electronic band structures are common, and these features may lead to superconductivity due to the strong condensation of electronic states. However, the electron–phonon coupling between flat bands and single longitudinal acoustic (LA) phonons has not been extensively studied or reported. In this work, using group theory, symmetry analysis, and first-principles calculations, we investigate flat electron bands, phonon spectra, and electron–phonon coupling in a two-dimensional metallic InTe monolayer. Our study reveals that the electron–phonon interaction in the intrinsic Kramers nodal line, with a van Hove singularity near the Fermi level, primarily involves a single LA phonon mode that couples strongly with the flat band electrons. This interaction leads to a slightly anisotropic superconducting gap function. Our findings provide new insights into the role of phonon-mediated electron interactions in superconductors with flat bands.","PeriodicalId":61,"journal":{"name":"The Journal of Physical Chemistry C","volume":null,"pages":null},"PeriodicalIF":3.3000,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Journal of Physical Chemistry C","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1021/acs.jpcc.4c04708","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Two-dimensional topological materials with flat bands and van Hove singularities in their electronic band structures are common, and these features may lead to superconductivity due to the strong condensation of electronic states. However, the electron–phonon coupling between flat bands and single longitudinal acoustic (LA) phonons has not been extensively studied or reported. In this work, using group theory, symmetry analysis, and first-principles calculations, we investigate flat electron bands, phonon spectra, and electron–phonon coupling in a two-dimensional metallic InTe monolayer. Our study reveals that the electron–phonon interaction in the intrinsic Kramers nodal line, with a van Hove singularity near the Fermi level, primarily involves a single LA phonon mode that couples strongly with the flat band electrons. This interaction leads to a slightly anisotropic superconducting gap function. Our findings provide new insights into the role of phonon-mediated electron interactions in superconductors with flat bands.
二维拓扑材料的电子带结构中具有平坦带和范霍夫奇点的现象很常见,这些特征可能会由于电子态的强烈凝聚而导致超导。然而,平带与单一纵向声子(LA)之间的电子-声子耦合尚未得到广泛研究和报道。在这项研究中,我们利用群论、对称性分析和第一性原理计算,研究了二维金属铟碲单层中的平坦电子带、声子谱和电子-声子耦合。我们的研究发现,在费米水平附近具有范霍夫奇点的本征克拉默结线中,电子与声子的相互作用主要涉及与平坦带电子强烈耦合的单个 LA 声子模式。这种相互作用导致了轻微的各向异性超导间隙函数。我们的发现为了解声子介导的电子相互作用在平带超导体中的作用提供了新的视角。
期刊介绍:
The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.