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Low Temperature Scanning Tunneling Microscope Study Of Low Dimensional Superconductivity On Metallic Nanostructures
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Book Synopsis Low Temperature Scanning Tunneling Microscope Study of Low-dimensional Superconductivity on Metallic Nanostructures by : Jungdae Kim
Download or read book Low Temperature Scanning Tunneling Microscope Study of Low-dimensional Superconductivity on Metallic Nanostructures written by Jungdae Kim and published by . This book was released on 2010 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconductivity is a remarkable quantum phenomenon in which a macroscopic number of electrons form a condensate of Cooper pairs that can be described by a single quantum wave function. According to the celebrated Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity, there is a minimum length scale (the coherence length) below which the condensate has a rigid quantum phase. The fate of superconductivity in a system with spatial dimensions smaller than [the coherence length] has been the subject of intense interest for decades and recent studies of superconductivity in ultra-thin epitaxial metal films have revealed some surprising behaviors in light of BCS theory. Notably, it was found that superconductivity remains robust in thin lead films with thicknesses orders of magnitude smaller than the coherence length (i.e. in the extreme two dimensional limit). Such studies raise the critical question: what happens to superconductivity as all dimensions are reduced toward the zero dimensional limit? By controlling the lateral size of ultra thin 2D islands, we systematically address this fundamental question with a detailed scanning tunneling microscopy/spectroscopy study. We show that as the lateral dimension is reduced, the strength of the superconducting order parameter is also reduced, at first slowly for dimensions larger than the bulk coherence length, and then dramatically at a critical length scale of ~ 40nm. We find this length scale corresponds to the lateral decay length of the order parameter in an island containing regions of different heights and different superconducting strength. Overall, our results suggest that fluctuation corrections to the BCS theory are important in our samples and may need to be systematically addressed by theory.
Book Synopsis Low Temperature Scanning Tunneling Microscope Study of Metallic Thin Films and Nanostructures on the Semiconductor Substrates by : Shengyong Qin
Download or read book Low Temperature Scanning Tunneling Microscope Study of Metallic Thin Films and Nanostructures on the Semiconductor Substrates written by Shengyong Qin and published by . This book was released on 2008 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many properties of the thin films are different from the bulk value and in many cases, depend dramatically on the film thickness. In the metallic ultra-thin films epitaxially grown on the semiconductor substrate, the conduction electrons are confined by the vacuum and metal-semiconductor interface. When the film thickness is comparable to the electron Fermi wavelength, this confinement will produce discrete energy levels known as quantum well states (QWS), which dramatically modify the electronic structures of the thin film and this is called quantum size effect (QSE). QSE will have a profound effect on a lot of physical properties of the thin films. Among various systems exhibiting QSE, Pb/Si (111) is the most widely studied one and exhibits the richest phenomena in QSE. In this study, a home made low temperature Scanning Tunneling Microscopy/Spectroscopy (LT-STM/S) was used to study the superconductivities of the Pb thin films. Quantum oscillations of the superconductivity have been observed for the films down to 4 monolayer and the oscillation amplitude increases as the film gets thinner. To resolve the discrepancies between the superconductivities measured with ex-situ transport and in-situ STS. We also studied the influence of Au overlay on the Pb thin films with LT-STM/S, and found out the deposition of Au on Pb dramatically roughened the Pb films. Finally, we successfully grew large scale near perfect 2ML Pb films. There are two types of films which exhibit different Moiré patterns. LT-STS studies revealed there is big difference in the superconductivity Tc of these two films, both of which decreased dramatically from that of the 4ML film.
Book Synopsis Low Temperature Scanning Tunneling Microscope Study of Metallic Thin Films on the Semiconductor Substrates by : Daejin Eom
Download or read book Low Temperature Scanning Tunneling Microscope Study of Metallic Thin Films on the Semiconductor Substrates written by Daejin Eom and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of Superconductors Using a Low-temperature Scanning Tunneling Microscope by : Roberta Kathryn Zasadzinski
Download or read book Studies of Superconductors Using a Low-temperature Scanning Tunneling Microscope written by Roberta Kathryn Zasadzinski and published by . This book was released on 1995 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Construction of a Low Temperature Scanning Tunneling Microscope for Studying High Temperature Superconductivity by : Dilushan R. Jayasundara
Download or read book Design and Construction of a Low Temperature Scanning Tunneling Microscope for Studying High Temperature Superconductivity written by Dilushan R. Jayasundara and published by . This book was released on 2008 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of Nanostructure Fabrication and Properties by Low Temperature Ultrahigh Vacuum Scanning Tunneling Microscopy by : Jian Zhang
Download or read book Studies of Nanostructure Fabrication and Properties by Low Temperature Ultrahigh Vacuum Scanning Tunneling Microscopy written by Jian Zhang and published by . This book was released on 1997 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An ultra high vacuum low temperature scanning tunneling microscope and its applications to high Tc [subscript c] superconductors and quasi one-dimensional organic conductors by : Shuheng Pan
Download or read book An ultra high vacuum low temperature scanning tunneling microscope and its applications to high Tc [subscript c] superconductors and quasi one-dimensional organic conductors written by Shuheng Pan and published by . This book was released on 1991 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scanning Tunneling Microscopy (STM) Studies of Low-Dimensional Materials by : Ling Fu
Download or read book Scanning Tunneling Microscopy (STM) Studies of Low-Dimensional Materials written by Ling Fu and published by . This book was released on 2017 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scanning Tunneling Microscopy on Low Dimensional Systems by : Christian David Salazar Enríquez
Download or read book Scanning Tunneling Microscopy on Low Dimensional Systems written by Christian David Salazar Enríquez and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Low-dimensional Supramolecular Architectures by Low-temperature Scanning Tunneling Microscopy by : Sylvain Clair
Download or read book Investigation of Low-dimensional Supramolecular Architectures by Low-temperature Scanning Tunneling Microscopy written by Sylvain Clair and published by . This book was released on 2004 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a New Low Temperature Scanning Tunneling Microscope to Study Mass Selected Cluster Deposition by : Harald Jödicke
Download or read book Development of a New Low Temperature Scanning Tunneling Microscope to Study Mass Selected Cluster Deposition written by Harald Jödicke and published by . This book was released on 1999 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scanning Tunneling Microscopy of Two-dimensional Materials by : Grady A. Gambrel
Download or read book Scanning Tunneling Microscopy of Two-dimensional Materials written by Grady A. Gambrel and published by . This book was released on 2017 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional materials are of fundamental and practical interest due to the unique properties they exhibit. As they are only one layer or one atom thick, their physical and electronic properties are sensitive to their local environment, and may be manipulated by engineering variations within the materials. Incorporating these materials into electronic devices requires that their interactions are well understood so that they behave as predicted. For this reason, the study of defects, likely contaminants, and engineered structures is worthwhile. The scanning tunneling microscope is of particular use in such experiments as it can be used to characterize the atomic structure and locally measure the electronic properties of samples. Graphene islands were grown on Cu(111) in ultrahigh vacuum to study graphene/copper interactions with minimal surface adsorbates. Using in situ low-temperature scanning tunneling microscopy (STM), both the physical and electronic structure were measured with atomic spatial resolution and compared with those of clean copper regions. These measurements indicate a decrease in the work function relative to clean Cu(111) and reduced coupling of surface electronic states to the bulk. Other measurements find that both the band edge and effective mass of Shockley surface state electrons are infuenced by the graphene layer. Similarly, single-layer germanene was grown on and measured on Cu(111). A competing alloy process which forms Cu2Ge restricts notable germanene coverage to a substrate temperature range between 40 degrees and 150 degrees Celsius. Atomic resolution imaging and tunneling spectroscopy are used to distinguish germanene and Cu2Ge regions, and probe the interaction of both with the Cu(111) substrate. Germanene was found to be weakly coupled to the Cu(111), maintaining an incommensurate 3.8 Angstrom lattice but lack any clear signatures of the Dirac point. In contrast, a 4.4 Angstrom lattice is observed on Cu2Ge that is commensurate with a v3 x v3 R30 reconstruction of Cu(111), and distinct unoccupied electronic states are observed well above the sample Fermi level.
Book Synopsis Low Temperature Scanning Tunneling Microscopy Studies of Single Molecules Adsorbed on Thin Insulating Films by :
Download or read book Low Temperature Scanning Tunneling Microscopy Studies of Single Molecules Adsorbed on Thin Insulating Films written by and published by . This book was released on 2008 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work is concentrated on the study of two isomers of an organic molecule -methylterrylene- adsorbed on a thin insulating _lm (a NaCl bi or tri-layer) deposited on a metallic substrate -Cu(111)-, by Scanning Tunneling Microscopy and Spectroscopy (STM and STS). Most STM studies of adsorbed atoms and molecules up to now have been performed on metallic or semiconducting surfaces. In this situation, the object is strongly electronically coupled to the substrate. The atomic or molecular levels are then shifted and broadened in energy, with the consequence that some of the intrinsic properties of the object are lost, to a more or less large extend. It has been shown recently that interposing between this object and the substrate an insulating leads to an efficient decoupling which allows to recover some of these properties. This decoupling effect of the insulating layer is at the center of the work reported here. Experiments where the molecules are directly adsorbed on the metal are compared with experiments where the molecule is decoupled from the Cu(111) surface by a NaCl bi-layer. The interpretation of these experimental results is supported and extended by current and image calculations with the Elastic Scattering Quantum Chemistry method where the structure of the Metal-insulating layer-molecule-metal junction is described at the atomic level. In the framework of molecular electronics, where the objective is to design and use molecules as electronic devices, understanding and controlling the coupling of a molecule to its environment is a central issue.
Book Synopsis Low-temperature Scanning Tunneling Microscopy Studies of Organic Molecules on Noble Metal Surfaces by : Matthias Böhringer
Download or read book Low-temperature Scanning Tunneling Microscopy Studies of Organic Molecules on Noble Metal Surfaces written by Matthias Böhringer and published by . This book was released on 1997 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scanning Tunneling Microscopy and Spectroscopy Measurements of Superconductor/Ferromagnet Hybrids by : Steven Alan Moore
Download or read book Scanning Tunneling Microscopy and Spectroscopy Measurements of Superconductor/Ferromagnet Hybrids written by Steven Alan Moore and published by . This book was released on 2015 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this thesis work is the study of the nanoscale electronic properties of magnetically coupled superconductor/ferromagnet hybrid structures using low-temperature scanning tunneling microscopy and spectroscopy (LT-STM/STS) under ultra-high vacuum conditions. There are a number of novel effects that can occur due to the non-homogenous magnetic field from the ferromagnet, which directly influence the global and local superconducting properties. These effects include the generation of vortices/anti-vortices by the non-uniform magnetic stray field, local modulations in the critical temperature, filamentary superconductivity close to the transition temperature, and superconducting channels that can be controlled by external magnetic fields. Prior to this dissertation the subject of superconductor/ferromagnet hybrid structures has been mainly studied using global measurements (such as transport and magnetization) or scanning probe techniques that are sensitive to the magnetic field. Scanning tunneling microscopy probes the local electronic density of states with atomic resolution, and therefore is the only technique that can study the emergence of superconductivity on the length scale of the coherence length. The novel results presented in this dissertation show that magnetically coupled superconductor/ferromagnet heterostructures offer the possibility to control and tune the strength and location of superconductivity and superconducting vortices, which has potential for promising technological breakthroughs in computing and power applications.
Book Synopsis Scanning Tunneling Microscope Studies of the High Temperature Superconductor BSCCO by : Alan Fang
Download or read book Scanning Tunneling Microscope Studies of the High Temperature Superconductor BSCCO written by Alan Fang and published by . This book was released on 2008 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Temperature Scanning Tunneling Microscopy Studies of the Surface and Impurity States in Narrow Gap Semiconductors by : Sergei Urazhdin
Download or read book Low Temperature Scanning Tunneling Microscopy Studies of the Surface and Impurity States in Narrow Gap Semiconductors written by Sergei Urazhdin and published by . This book was released on 2002 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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