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Author : Christian David Salazar Enríquez
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (965 download)
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:
Author : Ling Fu
Publisher :
ISBN 13 :
Total Pages : 298 pages
Book Rating : 4.:/5 (12 download)
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:
Author : Aaron Joe Bradley
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (919 download)
Download or read book Local Probe Investigation of the Electronic Structure of Molecule-Based and Transition-Metal-Based Low Dimensional Systems Using Cryogenic Scanning Tunneling Microscopy and Spectroscopy written by Aaron Joe Bradley and published by . This book was released on 2015 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of the many fascinating topics in condensed matter physics, this dissertation aims to cover three subtopics in some detail: 1) Functionalization of surfaces - using single molecules and/or atoms to change the behavior of a surface. 2) Low dimensional systems - 0D, 1D, or 2D materials whose behavior is often drastically different from the 3D world. 3) 3D to 2D crossover - studying what happens to materials as they are thinned down from a bulk 3D morphology to a single 2D layer. In addition to these areas of research, there will also be a focus on the modifications I made to the Toucan STM, and the rationale behind those changes. This portion, in combination with Niv Levy's dissertation, should serve as a user's manual for that microscope.
Author : Luis M. Liz-Marzán
Publisher : Springer Science & Business Media
ISBN 13 : 940100143X
Total Pages : 329 pages
Book Rating : 4.4/5 (1 download)
Download or read book Low-Dimensional Systems: Theory, Preparation, and Some Applications written by Luis M. Liz-Marzán and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented at the NATO Advanced Research Workshop (ARW) Dynamic Interactions in Quantum Dot Systems held at Hotel Atrium in Puszczykowo, near Poznan, Poland, May 16-19,2002. The term low-dimensional systems, which is used in the title of this volume, refers to those systems which contain at least one dimension that is intermediate between those characteristic ofatoms/molecules and those ofthe bulk material. Depending on how many dimensions lay within this range, we generally speak of quantum wells, quantum wires, and quantum dots. As such an intermediate state, some properties of low-dimensional systems are very different to those of their molecular and bulk counterparts. These properties generally include optical, electronic, and magnetic properties, and all these are partially covered in this book. The main goal of the workshop was to discuss the actual state of the art in the broad area ofnanotechnology. The initial focus was on the innovative synthesis of nanomaterials and their properties such as: quantum size effects, superparamagnetism, or field emission. These topics lead us into the various field based interactions including plasmon- magnetic spin- and exciton coupling. The newer, more sophisticated methods for characterization of nanomaterials were discussed, as well as the methods for possible industrial applications. In general, chemists and physicists, as well as experts on both theory and experiments on nanosized regime structures were brought together, to discuss the general phenomena underlying their fields ofinterest from different points ofview.
Author : Jungdae Kim
Publisher :
ISBN 13 :
Total Pages : 220 pages
Book Rating : 4.:/5 (758 download)
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.
Author : Guenther Neubauer
Publisher : Springer Science & Business Media
ISBN 13 : 3642848575
Total Pages : 367 pages
Book Rating : 4.6/5 (428 download)
Download or read book Low-Dimensional Electronic Systems written by Guenther Neubauer and published by Springer Science & Business Media. This book was released on 2013-03-13 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: Owing to new physical, technological, and device concepts of low-dimensionalelectronic systems, the physics and fabrication of quasi-zero, one- and two-dimensional systems are rapidly growing fields. The contributions presented in this volume cover results of nanostructure fabrication including recently developed techniques, for example, tunneling probe techniques and molecular beam epitaxy, quantum transport including the integer and fractional quantum Hall effect, optical and transport studies of the two-dimensional Wigner solid, phonon studies of low-dimensional systems, and Si/SiGe heterostructures and superlattices. To the readers new in the field this volume gives a comprehensive introduction and for the experts it is an update of their knowledge and a great help for decisions about future research activities.
Author : J.L. Morán-López
Publisher : Springer Science & Business Media
ISBN 13 : 0306471116
Total Pages : 465 pages
Book Rating : 4.3/5 (64 download)
Download or read book Physics of Low Dimensional Systems written by J.L. Morán-López and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oaxaca, Mexico, was the place chosen by a large international group of scientists to meet and discuss on the recent advances on the understanding of the physical prop- ties of low dimensional systems; one of the most active fields of research in condensed matter in the last years. The International Symposium on the Physics of Low Dim- sions took place in January 16-20, 2000. The group of scientists converging into the historical city of Oaxaca, in the state of the same name, had come from Argentina, Chile, Venezuela, several places in Mexico, Canada, U. S. A. , England, France, Italy, Germany, Russia, and Switzerland. The presentations at the workshop provided sta- of-art reviews of many of the most important problems, currently under study. Equally important to all the participants in the workshop was the fact that we had come to honor a friend, Hans Christoph Siegmann, on his sixty-fifth birthday. This Festschrift recognizes the intellectual leadership of Professor Siegmann in the field and as a sincere homage to his qualities as an exceptional friend, college and mentor. Those who have had the privilege to work closely with Hans Christoph have been deeply impressed by his remarkable analytic mind as well as by his out of range kindness and generosity. Hans Christoph has contributed to the understanding of the difficult and very important problem of the magnetic properties of finite systems: surfaces, thin films, heterostructures.
Author : Tobias Brandes
Publisher : Springer
ISBN 13 : 3540464387
Total Pages : 220 pages
Book Rating : 4.5/5 (44 download)
Download or read book Low-Dimensional Systems written by Tobias Brandes and published by Springer. This book was released on 2008-01-11 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental progress over the past few years has made it possible to test a n- ber of fundamental physical concepts related to the motion of electrons in low dimensions. The production and experimental control of novel structures with typical sizes in the sub-micrometer regime has now become possible. In parti- lar, semiconductors are widely used in order to con?ne the motion of electrons in two-dimensional heterostructures. The quantum Hall e?ect was one of the ?rst highlights of the new physics that is revealed by this con?nement. In a further step of the technological development in semiconductor-heterostructures, other arti?cial devices such as quasi one-dimensional ‘quantum wires’ and ‘quantum dots’ (arti?cial atoms) have also been produced. These structures again di?er very markedly from three- and two-dimensional systems, especially in relation to the transport of electrons and the interaction with light. Although the technol- ical advances and the experimental skills connected with these new structures are progressing extremely fast, our theoretical understanding of the physical e?ects (such as the quantum Hall e?ect) is still at a very rudimentary level. In low-dimensional structures, the interaction of electrons with one another and with other degrees of freedoms such as lattice vibrations or light gives rise to new phenomena that are very di?erent from those familiar in the bulk ma- rial. The theoretical formulation of the electronic transport properties of small devices may be considered well-established, provided interaction processes are neglected.
Author : Sylvain Clair
Publisher :
ISBN 13 :
Total Pages : 123 pages
Book Rating : 4.:/5 (853 download)
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:
Author : Adam Richard Sciambi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (781 download)
Download or read book Virtual Scanning Tunneling Microscopy written by Adam Richard Sciambi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two dimensional electron systems (2DESs) at semiconductor interfaces are a useful medium for studying complex physics due to their very low disorder and relative simplicity. Many interesting effects, such as the quantum Hall effect, have been discovered through transport measurements in such systems. Unfortunately, the interfacial nature of 2DESs and the related surface energy barrier means that directly accessing them from the surface is difficult. This has limited our understanding of theoretically-predicted, spatially-organized effects such Wigner-crystal microemulsions and quantum Hall stripes, which have been probed only indirectly. In this dissertation, we develop a new type of local probe that circumvents the surface barrier by tunneling into a 2DES from a second 2DES grown nearby. The interlayer tunneling happens directly below a scanned metal tip outside the sample, behaving as a virtual tip in a system we call Virtual Scanning Tunneling Microscopy (VSTM). In the first half of the dissertation, we discuss a novel mechanism for tuning tunneling locally between two 2DESs. Its premise is that raising a quantum potential well next to an adjacent barrier is energetically similar to lowering the barrier relative to a fixed well. A lower barrier leads to the quantum well wave function extending into it and to increased tunneling into a second quantum well on the opposite side. We characterize this mechanism in a GaAs-AlGaAs heterostructure as a new type of transistor. In the second half of the dissertation, results from a working VSTM system are presented, with local interlayer tunneling revealing hidden features in the interfaces below the surface.
Author : C. Schlenker
Publisher : Springer Science & Business Media
ISBN 13 : 1461311497
Total Pages : 477 pages
Book Rating : 4.4/5 (613 download)
Download or read book Physics and Chemistry of Low-Dimensional Inorganic Conductors written by C. Schlenker and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of low-dimensional conductors has been very active for more than twenty years. It has grown continuously and both the inorganic and organic materials have remark able properties, such as charge and spin density waves and superconductivity. The discovery of superconductivity at high temperature in copper-based quasi two-dimensional conducting oxides nearly ten years ago has further enlarged the field and stimulated new research on inorganic conductors. It was obviously impossible to cover such a broad field in a ten day Institute and it seemed pertinent to concentrate on inorganic conductors, excluding the high Tc superconducting oxides. In this context, it was highly desirable to include both physics and chemistry in the same Institute in order to tighten or in some cases to establish links between physicists and chemists. This Advanced Study Institute is the continuation of a series of similar ones which have taken place every few years since 1974. 73 participants coming from 13 countries have taken part in this School at the beautiful site of the Centre de Physique des Houches in the Mont-Blanc mountain range. The scientific programme included more than forty lectures and seminars, two poster sessions and ten short talks. Several discussion sessions were organized for the evenings, one on New Materials, one on New Topics and one on the special problem of the Fermi and Luttinger liquids. The scientific activity was kept high from the beginning to the end of the Institute.
Author : Robert M. Metzger
Publisher : Springer Science & Business Media
ISBN 13 : 1489920889
Total Pages : 729 pages
Book Rating : 4.4/5 (899 download)
Download or read book Lower-Dimensional Systems and Molecular Electronics written by Robert M. Metzger and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 729 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume represents the written account of the NATO Advanced Study Institute "Lower-Dimensional Systems and Molecular Electronics" held at Hotel Spetses, Spetses Island, Greece from 12 June to 23 June 1989. The goal of the Institute was to demonstrate the breadth of chemical and physical knowledge that has been acquired in the last 20 years in inorganic and organic crystals, polymers, and thin films, which exhibit phenomena of reduced dimensionality. The interest in these systems started in the late 1960's with lower-dimensional inorganic conductors, in the early 1970's with quasi-one-dimensional crystalline organic conductors. which by 1979 led to the first organic superconductors, and, in 1977, to the fITSt conducting polymers. The study of monolayer films (Langmuir-Blodgett films) had progressed since the 1930's, but reached a great upsurge in . the early 1980's. The pursuit of non-linear optical phenomena became increasingly popular in the early 1980's, as the attention turned from inorganic crystals to organic films and polymers. And in the last few years the term "moleculw' electronics" has gained ever-increasing acceptance, although it is used in several contexts. We now have organic superconductors with critical temperatures in excess of 10 K, conducting polymers that are soluble and processable, and used commercially; we have films of a few monolayers that have high in-plane electrical conductivity, and polymers that show great promise in photonics; we even have a few devices that function almost at the molecular level.
Author :
Publisher : Academic Press
ISBN 13 : 008086015X
Total Pages : 481 pages
Book Rating : 4.0/5 (88 download)
Download or read book Scanning Tunneling Microscopy written by and published by Academic Press. This book was released on 1993-03-25 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scanning tunneling microscopy (STM) and its extensions have become revolutionary tools in the fields of physics, materials science, chemistry, and biology. These new microscopies have evolved from their beginnings asresearch aids to their current use as commercial tools in the laboratory and on the factory floor. New wonders continue to unfold as STM delivers atomic scale imaging and electrical characterization of the newly emerging nanometer world. This volume in the METHODS OF EXPERIMENTAL PHYSICS Series describes the basics of scanning tunneling microscopy, provides a fundamental theoretical understanding of the technique and a thorough description of the instrumentation, and examines numerous examples and applications. Written by the pioneers of the field, this volume is an essential handbook for researchers and users of STM, as well as a valuable resource for libraries.
Author : Michael Bowker
Publisher : John Wiley & Sons
ISBN 13 : 9783527628834
Total Pages : 258 pages
Book Rating : 4.6/5 (288 download)
Download or read book Scanning Tunneling Microscopy in Surface Science, Nanoscience, and Catalysis written by Michael Bowker and published by John Wiley & Sons. This book was released on 2009-11-11 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, top international authors in the field of STM and surface science present first-class contributions on this hot topic, bringing the reader up to date with the latest developments in this rapidly advancing field. The focus is on the nanoscale, particularly in relation to catalysis, involving developments in our understanding of the nature of the surfaces of oxides and nanoparticulate materials, as well as adsorption, and includes in-situ studies of catalysis on such model materials. Of high interest to practitioners of surface science, nanoscience, STM and catalysis.
Author : José L. Morán-López
Publisher : Springer Science & Business Media
ISBN 13 : 0306465663
Total Pages : 466 pages
Book Rating : 4.3/5 (64 download)
Download or read book Physics of Low Dimensional Systems written by José L. Morán-López and published by Springer Science & Business Media. This book was released on 2001-05-31 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains contributions on some of the most important and current topics on the physics of low dimensional systems. The main emphasis is on the magnetic properties of surfaces, thin films, and atomic clusters. State-of-the-art techniques are discussed in detail. Techniques for the production and measurement of nanostructures are discussed, and pioneering contributions on the effect on health of these particles are presented. Important studies on semiconductor nanostructures are addressed as well as aerosol systems.
Author : Grady A. Gambrel
Publisher :
ISBN 13 :
Total Pages : 131 pages
Book Rating : 4.:/5 (11 download)
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.
Author : Kho Liep Chok
Publisher :
ISBN 13 :
Total Pages : 196 pages
Book Rating : 4.:/5 (325 download)
Download or read book A Study on the Effects of Scanning Tunneling Microscope Tip on a Two-dimensional Electron Gas System written by Kho Liep Chok and published by . This book was released on 1994 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
