Journal ArticleDOI
Superconductivity Modulated by Quantum Size Effects
Yang Guo,Yanfeng Zhang,Xinyu Bao,Tie-Zhu Han,Zhe Tang,Lixin Zhang,Wenguang Zhu,Enge Wang,Qian Niu,Ziqiang Qiu,Jin-Feng Jia,Zhong-Xian Zhao,Qi-Kun Xue +12 more
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TLDR
The observed oscillatory behavior of the superconducting transition temperature when the film thickness was increased by one atomic layer at a time suggests the possibility of modifying superconductivity and other physical properties of a thin film by exploiting well-controlled and thickness-dependent quantum size effects.Abstract:
We have fabricated ultrathin lead films on silicon substrates with atomic-scale control of the thickness over a macroscopic area. We observed oscillatory behavior of the superconducting transition temperature when the film thickness was increased by one atomic layer at a time. This oscillating behavior was shown to be a manifestation of the Fabry-Perot interference modes of electron de Broglie waves (quantum well states) in the films, which modulate the electron density of states near the Fermi level and the electron-phonon coupling, which are the two factors that control superconductivity transitions. This result suggests the possibility of modifying superconductivity and other physical properties of a thin film by exploiting well-controlled and thickness-dependent quantum size effects.read more
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Freestanding palladium nanosheets with plasmonic and catalytic properties
Xiaoqing Huang,Shaoheng Tang,Xiaoliang Mu,Yan Dai,Guangxu Chen,Zhi-You Zhou,Fangxiong Ruan,Zhilin Yang,Nanfeng Zheng +8 more
TL;DR: The facile synthesis of freestanding hexagonal palladium nanosheets that are less than 10 atomic layers thick are reported, using carbon monoxide as a surface confining agent and exhibit a well-defined but tunable surface plasmon resonance peak in the near-infrared region.
Journal ArticleDOI
Size dependence of nanostructures: Impact of bond order deficiency
Chang Q. Sun,Chang Q. Sun +1 more
TL;DR: The BOLS correlation mechanism has been initiated and intensively verified as discussed by the authors, which has enabled the tunability of a variety of properties of a nanosolid to be universally reconciled to the effect of bond order deficiency of atoms at sites surrounding defects or near the surface edges of the nano-material.
Journal ArticleDOI
Characterization of collective ground states in single-layer NbSe 2
Miguel M. Ugeda,Miguel M. Ugeda,Aaron J. Bradley,Yi Zhang,Yi Zhang,Yi Zhang,Seita Onishi,Yi Chen,Wei Ruan,Wei Ruan,Claudia Ojeda-Aristizabal,Claudia Ojeda-Aristizabal,Claudia Ojeda-Aristizabal,Hyejin Ryu,Mark T. Edmonds,Mark T. Edmonds,Hsin-Zon Tsai,Alexander Riss,Alexander Riss,Sung-Kwan Mo,Dung-Hai Lee,Alex Zettl,Alex Zettl,Zahid Hussain,Zhi-Xun Shen,Zhi-Xun Shen,Michael F. Crommie,Michael F. Crommie +27 more
TL;DR: In this paper, it was shown that superconductivity and charge density wave ordering can remain intact in just a single layer of niobium diselenide, even when the material is thinned.
Journal ArticleDOI
The surfaces of bismuth: Structural and electronic properties
TL;DR: In this paper, the effect of the spin-orbit interaction on low-index surfaces of the group V semimetal bismuth has been studied and the main focus is on the geometric and electronic structure.
Journal ArticleDOI
Catalytically Active Gold: From Nanoparticles to Ultrathin Films
Mingshu Chen,D. Wayne Goodman +1 more
TL;DR: This is the first report of Au completely wetting an oxide surface and demonstrates that ultrathin Au films on a oxide surface have exceptionally high catalytic activity, comparable to the activity observed for Au nanoparticles.
References
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Journal ArticleDOI
Theory of Superconductivity
TL;DR: In this article, a theory of superconductivity is presented, based on the fact that the interaction between electrons resulting from virtual exchange of phonons is attractive when the energy difference between the electrons states involved is less than the phonon energy, and it is favorable to form a superconducting phase when this attractive interaction dominates the repulsive screened Coulomb interaction.
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Transition temperature of strong-coupled superconductors reanalyzed
Philip B. Allen,Robert C. Dynes +1 more
TL;DR: In this article, a through analysis of the dependence of the superconducting transition temperature on material properties is made, based on a combination of analytic and numerical solutions of the Eliashberg equations, and a comparison with tunneling data.
Journal ArticleDOI
Onset of superconductivity in the two-dimensional limit.
TL;DR: The onset of superconductivity in homogeneous ultrathin films is found to occur when their normal-state sheet resistance falls below a value close to h/4e/sup 2/, the quantum resistance for pairs, suggesting that in the T..-->..0 limit such films are either superconducting or insulating.
Journal ArticleDOI
Photoemission studies of quantum well states in thin films
TL;DR: In this paper, the authors review the basic physics and applications of quantum well spectroscopy, and provide a detailed understanding of the behavior of simple quantum wells including the effects of lattice mismatch, which provides a useful basis for investigating the properties of multilayers.