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Angle Resolved Photoemission Study Of The Evolution Of Band Structure And Charge Density Wave Properties In Rte3 R
Download Angle Resolved Photoemission Study Of The Evolution Of Band Structure And Charge Density Wave Properties In Rte3 R full books in PDF, epub, and Kindle. Read online Angle Resolved Photoemission Study Of The Evolution Of Band Structure And Charge Density Wave Properties In Rte3 R ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Angle-resolved Photoemission Study of the Evolution of Band Structure and Charge Density Wave Properties in RTe3 (R by :
Download or read book Angle-resolved Photoemission Study of the Evolution of Band Structure and Charge Density Wave Properties in RTe3 (R written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a detailed ARPES investigation of the RTe3 family, which sets this system as an ideal 'textbook' example for the formation of a nesting driven Charge Density Wave (CDW). This family indeed exhibits the full range of phenomena that can be associated to CDW instabilities, from the opening of large gaps on the best nested parts of Fermi Surface (FS) (up to 0.4eV), to the existence of residual metallic pockets. ARPES is the best suited technique to characterize these features, thanks to its unique ability to resolve the electronic structure in k-space. An additional advantage of RTe3 is that the band structure can be very accurately described by a simple 2D tight-binding (TB) model, which allows one to understand and easily reproduce many characteristics of the CDW. In this paper, we first establish the main features of the electronic structure, by comparing our ARPES measurements with Linear Muffin-Tin Orbital band calculations. We use this to define the validity and limits of the TB model. We then present a complete description of the CDW properties and, for the first time, of their strong evolution as a function of R. Using simple models, we are able to reproduce perfectly the evolution of gaps in k-space, the evolution of the CDW wave vector with R and the shape of the residual metallic pockets. Finally, we give an estimation of the CDW interaction parameters and find that the change in the electronic density of states n(Ef), due to lattice expansion when different R ions are inserted, has the correct order of magnitude to explain the evolution of the CDW properties.
Book Synopsis ARPES Study of the Evolution of Band Structure and Charge Density Wave Properties in RTe3 (R by :
Download or read book ARPES Study of the Evolution of Band Structure and Charge Density Wave Properties in RTe3 (R written by and published by . This book was released on 2008 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a detailed angle-resolved photoemission spectroscopy (ARPES) investigation of the RTe3 family, which sets this system as an ideal"textbook" example for the formation of a nesting driven charge density wave (CDW). This family indeed exhibits the full range of phenomena that can be associated to CDWinstabilities, from the opening of large gaps on the best nested parts of Fermi surface (up to 0.4 eV), to the existence of residual metallic pockets. ARPES is the best suited technique to characterize these features, thanks to its unique ability to resolve the electronic structure in k space. An additional advantage of RTe3 is that theband structure can be very accurately described by a simple two dimensional tight-binding (TB) model, which allows one to understand and easily reproduce many characteristics of the CDW. In this paper, we first establish the main features of the electronic structure by comparing our ARPES measurements with the linear muffin-tinorbital band calculations. We use this to define the validity and limits of the TB model. We then present a complete description of the CDW properties and of their strong evolution as a function of R. Using simple models, we are able to reproduce perfectly the evolution of gaps in k space, the evolution of the CDW wave vector with R, and the shape of the residual metallic pockets. Finally, we give an estimation of the CDWinteraction parameters and find that the change in the electronic density of states n (EF), due to lattice expansion when different R ions are inserted, has the correct order of magnitude to explain the evolution of the CDW properties.
Book Synopsis Emergent States in Photoinduced Charge-Density-Wave Transitions by : Alfred Zong
Download or read book Emergent States in Photoinduced Charge-Density-Wave Transitions written by Alfred Zong and published by Springer Nature. This book was released on 2021-09-17 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book advances understanding of light-induced phase transitions and nonequilibrium orders that occur in a broken-symmetry system. Upon excitation with an intense laser pulse, materials can undergo a nonthermal transition through pathways different from those in equilibrium. The mechanism underlying these photoinduced phase transitions has long been researched, but many details in this ultrafast, non-adiabatic regime still remain to be clarified. The work in this book reveals new insights into this phenomena via investigation of photoinduced melting and recovery of charge density waves (CDWs). Using several time-resolved diffraction and spectroscopic techniques, the author shows that the light-induced melting of a CDW is characterized by dynamical slowing-down, while the restoration of the symmetry-breaking order features two distinct timescales: A fast recovery of the CDW amplitude is followed by a slower re-establishment of phase coherence, the latter of which is dictated by the presence of topological defects in the CDW. Furthermore, after the suppression of the original CDW by photoexcitation, a different, competing CDW transiently emerges, illustrating how a hidden order in equilibrium can be unleashed by a laser pulse. These insights into CDW systems may be carried over to other broken-symmetry states, such as superconductivity and magnetic ordering, bringing us one step closer towards manipulating phases of matter using a laser pulse.
Book Synopsis Probing the Band Structure of LaTe2 Using Angle Resolvedphotoemission Spectroscopy by : Y. S. Kwon
Download or read book Probing the Band Structure of LaTe2 Using Angle Resolvedphotoemission Spectroscopy written by Y. S. Kwon and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: With the current interest in the rare-earth tellurides ashigh temperature charge density wave materials, a greater understandingof the physics of these systems is needed, particularly in the case ofthe ditellurides. We report a detailed study of the band structure ofLaTe_2 in the charge density wave state using high-resolution angleresolved photoemission spectroscopy (ARPES). From thiswork we hope toprovide insights into the successes and weaknesses of past theoreticalstudy as well as helping to clear up prior ambiguities by providing anexperimental basis for future work inthe tellurides.
Book Synopsis Study of Electron-hole Fluctuations Above the Transition Temperature of the Charge-density Wave Phase in 1T-TiSe2 and Soft X-ray Resonant Angle-resolved Photoemission Study of Titanium Intercalated Atoms at Low Temperature by : Gaël Monney
Download or read book Study of Electron-hole Fluctuations Above the Transition Temperature of the Charge-density Wave Phase in 1T-TiSe2 and Soft X-ray Resonant Angle-resolved Photoemission Study of Titanium Intercalated Atoms at Low Temperature written by Gaël Monney and published by . This book was released on 2017 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Valence Band Photoemission Studies of Clean Metals by : Paul Sherman Wehner
Download or read book Valence Band Photoemission Studies of Clean Metals written by Paul Sherman Wehner and published by . This book was released on 1978 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ARPES (Angle Resolved Photoemission Spectroscopy) Investigation of the Valence Band Structure and Band-gap State of Rutile Ti0(110) - (1x1) by :
Download or read book ARPES (Angle Resolved Photoemission Spectroscopy) Investigation of the Valence Band Structure and Band-gap State of Rutile Ti0(110) - (1x1) written by and published by . This book was released on 2010 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Angle-resolved Photoemission Studies of Two-dimensional Electron Systems by : Yang Liu
Download or read book Angle-resolved Photoemission Studies of Two-dimensional Electron Systems written by Yang Liu and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation examines the electronic properties of 2D electron systems, including ultrathin metallic films grown on semiconductor substrates and graphite/graphene layers. Both systems are (quasi) two-dimensional and are of particular interest due to their technological importance. The major experimental tool is angle-resolved photoemission spectroscopy, which can directly measure the spectral function of the quasiparticle. The study of ultrathin metallic films focuses on the substrate effect on the electronic structure of the film. Thin metallic films can support quantum well states, which are essentially electronic standing waves. Our work on Ag films grown on Ge(111) demonstrates that the incommensurate interface potential results in strong modifications to quantum well states. The observed electronic interference structures are attributable to the mixing of electronic standing waves by the Ag-Ge interface potential. The complex Fermi surface, as a result of this interface scattering, can affect the electronic transport properties. An even stronger modification of quantum well states can be observed when the metal films are grown on stepped substrates. More specifically, our study of corrugated Ag/Pb films grown on Si(557)-Au surface reveals multiple sets of quantum well states that are centered at the Brillouin zone boundaries corresponding to the step modulation. This indicates that the valence electrons form coherent grating cavity modes which are defined by the corrugation geometry. Graphitic materials, made of sheets of carbon atomic layers, have unusual electronic structures known as Dirac cones. Our photoemission measurements of graphite/graphene layers reveal unexpected gaps at normal emission, one at ~67 meV and another much weaker one at ~150 meV. The major gap features persist up to room temperature, and diminish with increasing emission angles. We show that these gaps arise from electronic coupling to out-of-plane and in-plane vibrational modes at the point, respectively, in accordance with conservation laws and selection rules governed by quantum mechanics. Our study suggests a new approach for characterizing phonons and electron-phonon coupling in solids.
Book Synopsis Angle-resolved Photoemission Investigations of the Electronic Structure, Fermi Surface and Superconducting Gap of Yttrium Barium Copper Oxide by : Matthias Christian Schabel
Download or read book Angle-resolved Photoemission Investigations of the Electronic Structure, Fermi Surface and Superconducting Gap of Yttrium Barium Copper Oxide written by Matthias Christian Schabel and published by . This book was released on 1997 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Angle-Resolved Photoemission Studies of Ag, Au, and Pt by :
Download or read book Angle-Resolved Photoemission Studies of Ag, Au, and Pt written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An important question regarding the technique of angle-resolved photoemission (ARP) is the extent to which it can be used to determine experimental valence-band dispersion relations E{sub i}({rvec k}) for single crystalline solids. In the case of the 3d and 4d transition metals, studies of copper, nickel, palladium, and silver, show that a model based on the assumption of direct interband transitions (direct-transition model) may be used, in conjunction with an appropriate final-state dispersion relation E{sub f}({rvec k}), to elucidate E{sub i}({rvec k}) for these materials along several high symmetry lines (primarily [Gamma][Lambda]L) in k-space. To answer this question more generally, we have undertaken an extensive study of the valence band structures of other transition metals along various k-space lines. To date, studies have been extended to the (111) faces of the 5d metals Pt and Au along with the Pt(100) ((5 x 20) surface structure) face, and the (110) and (100) faces of Ag. The experiments were all conducted at SSRL, using synchrotron radiation in the range 6 eV
Book Synopsis A Study of Angle-resolved Photoemission Extended Fine Structure as Applied to the Ni 3p, Cu 3s, and Cu 3p Core Levels of the Respective Clean (111) Surfaces by :
Download or read book A Study of Angle-resolved Photoemission Extended Fine Structure as Applied to the Ni 3p, Cu 3s, and Cu 3p Core Levels of the Respective Clean (111) Surfaces written by and published by . This book was released on 1997 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first non-s initial state angle-resolved photoemission extended fine structure (ARPEFS) study of clean surfaces for the purpose of further understanding the technique is reported. The surface structure sensitivity of ARPEFS applied to clean surfaces and to arbitrary initial states is studied using normal photoemission data taken from the Ni 3p core levels of a Ni(111) single crystal and the Cu 3s and the Cu 3p core-levels of a Cu(111) single crystal. The Fourier transforms of these clean surface data are dominated by backscattering. Unlike the s initial state data, the p initial state data show a peak in the Fourier transform corresponding to in-plane scattering from the six nearest-neighbors to the emitter. Evidence was seen for single-scattering events from in the same plane as the emitters and double-scattering events. Using a newly developed, multiple-scattering calculation program, ARPEFS data from clean surfaces and from p initial states can be modeled to high precision. Although there are many layers of emitters when measuring photoemission from a clean surface, test calculations show that the ARPEFS signal is dominated by photoemission from atoms in the first two crystal layers. Thus, ARPEFS applied to clean surfaces is sensitive to surface reconstruction. The known contraction of the first two Cu(111) layers is confirmed. The best-fit calculation for clean Ni(111) indicates an expansion of the first two layers. To better understand the ARPEFS technique, the authors studied s and non-s initial state photoemission from clean metal surfaces.
Book Synopsis Angle-resolved photoemission studies of the bulk and surface electronic structure of gold, silver, and aluminum by : Göran Hansson
Download or read book Angle-resolved photoemission studies of the bulk and surface electronic structure of gold, silver, and aluminum written by Göran Hansson and published by . This book was released on 1978 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Angle-resolved Photoemission Extended Fine Structure by :
Download or read book Angle-resolved Photoemission Extended Fine Structure written by and published by . This book was released on 1995 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, angle-resolved photoemission extended fine structure (ARPEFS) has been applied to experimental systems involving multiple layers of emitters and non-s core-level photoemission in an effort to broaden the utility of the technique. Most of the previous systems have been comprised of atomic or molecular overlayers adsorbed onto a single-crystal, metal surface and the photoemission data were taken from an s atomic core-level in the overlayer. For such a system, the acquired ARPEFS data is dominated by the p{sub o} final state wave backscattering from the substrate atoms and is well understood. In this study, we investigate ARPEFS as a surface-region structure determination technique when applied to experimental systems comprised of multiple layers of photoemitters and arbitrary initial state core-level photoemission. Understanding the data acquired from multiple layers of photoemitters is useful for studying multilayer interfaces, ''buried'' surfaces, and clean crystals in ultra- high vacuum. The ability to apply ARPEFS to arbitrary initial state core-level photoemission obviously opens up many systems to analysis. Efforts have been ongoing to understand such data in depth. We present clean Cu(111) 3s, 3p, and 3d core-level, normal photoemission data taken on a high resolution soft x-ray beamline 9.3.2 at the Advanced Light Source in Berkeley, California and clean Ni(111) 3p normal photoemission data taken at the National Synchrotron Light Source in Upton, New York, USA.
Book Synopsis Valence Band Photoemission Studies of Clean Metals by :
Download or read book Valence Band Photoemission Studies of Clean Metals written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of Angle-Resolved Photoelectron Spectroscopy (ARPES) to crystalline solids and the utilization of such studies to illuminate several questions concerning the detailed electronic structure of such materials, are discussed. Specifically, by construction of a Direct Transition (DT) model and the utilization of energy-dependent angle-resolved normal photoemission in the photon energy range 32 eV
Book Synopsis Angle-resolved Photoemission Studies of Uniaxial Stress-driven Lifshitz Transitions in the Bulk and Surface Electronic Structure of Sr2RuO4 by : Edgar Abarca Morales
Download or read book Angle-resolved Photoemission Studies of Uniaxial Stress-driven Lifshitz Transitions in the Bulk and Surface Electronic Structure of Sr2RuO4 written by Edgar Abarca Morales and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Angle-resolved Photoemission Studies of Transition Metals in the Energy Range 8-1500 EV by : Zahid Hussain
Download or read book Angle-resolved Photoemission Studies of Transition Metals in the Energy Range 8-1500 EV written by Zahid Hussain and published by . This book was released on 1979 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Density Waves In Solids by : George Gruner
Download or read book Density Waves In Solids written by George Gruner and published by CRC Press. This book was released on 2018-03-08 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: ?Density Waves in Solids is written for graduate students and scientists interested in solid-state sciences. It discusses the theoretical and experimental state of affairs of two novel types of broken symmetry ground states of metals, charge, and spin density waves. These states arise as the consequence of electron-phonon and electron-electron interactions in low-dimensional metals.Some fundamental aspects of the one-dimensional electron gas, and of the materials with anisotropic properties, are discussed first. This is followed by the mean field theory of the phases transitions?discussed using second quantized formalism?together with the various experimental observations on the transition and on the ground states. Fluctuation effects and the collective excitations are reviewed next, using the Ginzburg-Landau formalism, followed by the review of the interaction of these states with the underlying lattice and with impurities. The final chapters are devoted to the response of the ground states to external perturbations.
