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The Electronic Structure Of Srtio3 From A Direct Transition Analysis Of Angle Resolved Photoemission Data
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Book Synopsis The Electronic Structure of SrTiO3 from a Direct-transition Analysis of Angle-resolved Photoemission Data by : N. B. Brookes
Download or read book The Electronic Structure of SrTiO3 from a Direct-transition Analysis of Angle-resolved Photoemission Data written by N. B. Brookes and published by . This book was released on 1985 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electronic Structure of P-type SrTiO3 by Photoemission Spectroscopy by : Tohru Higuchi
Download or read book Electronic Structure of P-type SrTiO3 by Photoemission Spectroscopy written by Tohru Higuchi and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hard and Soft X-ray Standing-wave Photoelectron Spectroscopy and Angle-resolved Photoemission Spectroscopy Study of LaNiO3/SrtTiO3 Superlattice and Its Interfaces by : Daria N. Eiteneer
Download or read book Hard and Soft X-ray Standing-wave Photoelectron Spectroscopy and Angle-resolved Photoemission Spectroscopy Study of LaNiO3/SrtTiO3 Superlattice and Its Interfaces written by Daria N. Eiteneer and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Many classes of materials that exhibit interesting characteristics in the modulation of the electronic and magnetic properties when they are made of more than one compound, often arranged in multilayers and superlattices. In such cases, the electronic, electric, and magnetic properties of the multilayer, as well as their densities-of-states, are vastly different from the properties of the constituent materials, with the most important features often located at the interfaces. Specifically, perovskite nickelates are examples of materials that lie at the heart of correlated electron physics. Prior studies have been done on superlattices that contain multilayers of two perovskites. Specifically, it has been shown that LaNiO3 (LNO) undergoes a Mott metal-insulator transition when sandwiched between the layers of SrTiO3 (STO). However, even with prior theoretical simulations and experimental studies, no conclusion has been reached so far as to the exact reason for such a transition. To further the investigation of these ideas, we are undertaking a detailed study of the electronic structure of a LaNiO3/SrTiO3 superlattice with 10 repeats of [4 unit-cell LNO/3 unit-cell STO] bilayer grown on an (LaAlO3)0.3(Sr2AlTaO6)0.7 substrate. To provide a complete characterization of this superlattice, it is crucial to characterize the core levels of the atoms at the interface, as well as to measure the depth-dependent density of states and the element-specific magnetization through the interface. The standing-wave photoemission technique provides a unique capability for characterizing the LNO/STO interfaces by depth-resolving the electronic structure of the superlattice, particularly in its momentum-resolving form of standing-wave angle-resolved photoemission using soft x-rays in the ca. 1 keV regime. The main advantages of SW-XPS are its non-destructiveness, large effective attenuation length, and the enhanced depth resolution for buried interfaces via standing-wave excitation, which makes use the interference of the incoming and outgoing x-rays setting up a standing wave inside and outside the multilayer. This standing wave can be subsequently varied in depth by either changing the incidence angle or the photon energy. Within the multilayer, a strong reflection at the first-order Bragg condition amplifies the standing wave. Being able to tune the standing wave by varying incidence angle, thus generating a rocking curve, or by varying the photon energy, permits a local enhancement or suppression of the regions directly at the interfaces between two materials or in the central regions of the two materials. In this study, we are employing x-ray photoemission spectroscopy specifically, the soft x-ray standing-wave-excited angle-resolved photoemission, together with soft- and hard- x-ray photoemission measurements of core levels, with data collected at three different beamlines (BLs 7.0.1 and 9.3.1 at the Advanced Light Source at LBNL in Berkeley, CA and BL15XU at SPring-8 in Japan). More precisely, we are demonstrating several aspects of using the depth selectivity of soft x-ray standing-wave photoemission (SW-XPS), and standing-wave angle-resolved photoemission (SWARPES), for studying the electronic structure of core levels and the valence band in buried layers and interfaces, including momentum-resolved electronic structure. This study is coupled with complementary characterization using more depth sensitive hard x-ray excitation (several keV), and with optical modeling. We are confirming our experimental findings for the LNO/STO multilayer by comparison with the theoretical calculations of band structures and densities of states. We further show that the behavior of the Ni 3d e[subscript g] and t2[subscript g] states near the Fermi level, as well as those at the bottom of the valence bands, is very similar to recently published results for an La0.7Sr0.3MnO3/SrTiO3 superlattice that was studied using the same technique, which further validates this approach and our conclusions. As a specific point, we make direct comparison of the electronic structure of the two superlattices studied with the same technique and highlight the similarities between the e[subscript g] and t2[subscript]g states of the transition metal Mn and Ni components. We also discuss differences between the two systems, which we attribute to the greater difficulty of growing LNO/STO, which can lead to rougher, less well-defined interfaces. The fact that SWARPES can, even for this case, still provide interface-specific momentum-resolved information is encouraging for its future applications to other multilayer systems.
Book Synopsis Phtoemission and Optical Studies of SrTiO3, TiO2, and VO2 by : Stanford University. Stanford Electronics Laboratories
Download or read book Phtoemission and Optical Studies of SrTiO3, TiO2, and VO2 written by Stanford University. Stanford Electronics Laboratories and published by . This book was released on 1970 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electronic Structure of the YH[sub]3[/sub] Phase from Angle-Resolved Photoemission Spectroscopy by :
Download or read book Electronic Structure of the YH[sub]3[/sub] Phase from Angle-Resolved Photoemission Spectroscopy written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-dimensional Electron Systems Studied by Angle- and Spin-resolved Photoemission Spectroscopy by : Ji Dai
Download or read book Low-dimensional Electron Systems Studied by Angle- and Spin-resolved Photoemission Spectroscopy written by Ji Dai and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials in which many-body interactions, low-dimensional confinement, and/or strong spin-orbit coupling are present show a rich variety of phenomena, but are still poorly understood. Essential information about the origin of such phenomena can be obtained by measuring their electronic structure. This thesis presents an experimental study of the electronic structure of some low-dimensional and/or strongly correlated materials of current fundamental interest, using angle- and spin-resolved photoemission spectroscopy (ARPES and SARPES). In the introductory part, I present my work on two innovative textbook examples showing how interactions affect the band structure of a material: the coupling of electrons with phonons in a Debye distribution in a two-dimensional electron system (2DES) in ZnO, a wide-band-gap oxide semiconductor used in photovoltaic applications, and the splitting induced by strong spin-orbit coupling (SOC) in the bulk valence band of ZnTe, another important semiconductor used in optoelectronic devices. Then, in the rest of this thesis, I discuss my original results in three different low-dimensional systems of current interest: 1.The realisation of a 2DES at the (110) surface of SnO2, the first of its kind in a rutile structure. Tunability of its carrier density by means of temperature or Eu deposition and robustness against surface reconstructions and exposure to ambient conditions make this 2DES promising for applications. By means of a simple redox reaction on the surface, this work has proven that oxygen vacancies can dope the conduction band minimum at the surface of SnO2, solving a long-debated issue about their role in n-type doping in SnO2. 2.The study of topological surface states in M2Te2X (with M = Hf, Zr, or Ti; and X = P or As), a new family of three-dimensional topological metals, originating from SOC and being protected by time-reversal symmetry. Their electronic structure and spin texture, studied by ARPES and SARPES, reveal the presence of massless Dirac fermions giving rise to Dirac-node arcs. 3.The investigation of the quasi-one-dimensional heavy-fermion material YbNi4P2, which presents a second-order quantum phase transition from a ferromagnetic to a paramagnetic phase upon partial substitution of phosphorous by arsenide. Such a transition is expected to occur only in zero- or one-dimensional systems, but a direct measurement of the electronic structure of ferromagnetic quantum-critical materials was missing so far. By careful in-situ preparation and cleaning of the surface of YbNi4P2 single crystals, which are impossible to cleave, their electronic structure has been successfully measured by ARPES, thus effectively unveiling the quasi-one-dimensionality of YbNi4P2. Moreover, the protocol used to make this material accessible to ARPES can be readily generalised to other exotic materials lacking a cleavage plane.
Book Synopsis Electronic Structure Study of Low-dimensional Systems with Angle-resolved Photoemission Spectroscopy by : Marco Papagno
Download or read book Electronic Structure Study of Low-dimensional Systems with Angle-resolved Photoemission Spectroscopy written by Marco Papagno and published by . This book was released on 2005 with total page 75 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 A New Spin on Photoemission Spectroscopy by :
Download or read book A New Spin on Photoemission Spectroscopy written by and published by . This book was released on 2008 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electronic spin degree of freedom is of general fundamental importance to all matter. Understanding its complex roles and behavior in the solid state, particularly in highly correlated and magnetic materials, has grown increasingly desirable as technology demands advanced devices and materials based on ever stricter comprehension and control of the electron spin. However, direct and efficient spin dependent probes of electronic structure are currently lacking. Angle Resolved Photoemission Spectroscopy (ARPES) has become one of the most successful experimental tools for elucidating solid state electronic structures, bolstered by-continual breakthroughs in efficient instrumentation. In contrast, spin-resolved photoemission spectroscopy has lagged behind due to a lack of similar instrumental advances. The power of photoemission spectroscopy and the pertinence of electronic spin in the current research climate combine to make breakthroughs in Spin and Angle Resolved Photoemission Spectroscopy (SARPES) a high priority . This thesis details the development of a unique instrument for efficient SARPES and represents a radical departure from conventional methods. A custom designed spin polarimeter based on low energy exchange scattering is developed, with projected efficiency gains of two orders of magnitude over current state-of-the-art polarimeters. For energy analysis, the popular hemispherical analyzer is eschewed for a custom Time-of-Flight (TOF) analyzer offering an additional order of magnitude gain in efficiency. The combined instrument signifies the breakthrough needed to perform the high resolution SARPES experiments necessary for untangling the complex spin-dependent electronic structures central to today's condensed matter physics.
Book Synopsis Two-dimensional Electron Systems in Functional Oxides Studied by Photoemission Spectroscopy by : Tobias Rödel
Download or read book Two-dimensional Electron Systems in Functional Oxides Studied by Photoemission Spectroscopy written by Tobias Rödel and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many transition metal oxides (TMOs) show complex physics, ranging from ferroelectricity to magnetism, high-Tc superconductivity and colossal magnetoresistance. The existence of a variety of ground states often occurs as different degrees of freedom (e.g. lattice, charge, spin, orbital) interact to form different competing phases which are quite similar in energy. The capability to epitaxially grow heterostructures of TMOs increased the complexity even more as new phenomena can emerge at the interface. One typical example is the two-dimensional electron system (2DES) at the interface of two insulating oxides, namely LaAlO3/SrTiO3, which shows metal-to-insulator transitions, magnetism or gate-tunable superconductivity. The origin of this thesis was the discovery of a similar 2DES at the bare surface of SrTiO3 fractured in vacuum, making it possible to study its electronic structure by angle-resolved photoemission spectroscopy (ARPES).In this thesis, the study of well-prepared surfaces, instead of small fractured facets, results in spectroscopic data showing line widths approaching the intrinsic value. This approach allows a detailed analysis of many-body phenomena like the renormalization of the self-energy due to electron-phonon interaction.Additionally, the understanding of the electronic structure of the 2DES at the surface of SrTiO3(001) was given an additional turn by the surprising discovery of a complex spin texture measured by spin-ARPES. In this thesis data is presented which contradicts these conclusions and discusses possible reasons for the discrepancy.One major motivation of this thesis was the question if and how the electronic structure and the properties of the 2DES can be changed or controlled. In this context, the study of 2DESs at (110) and (111) surface revealed that the electronic band structure of the 2DES (orbital ordering, symmetry of the Fermi surface, effective masses) can be tuned by confining the electrons at different surface orientations of the same material, namely SrTiO3.A major achievement of this thesis is the generalization of the existence of a 2DES in SrTiO3 to many other surfaces and interfaces of TMOs (TiO2 anatase, CaTiO3, BaTiO3) and even simpler oxides already used in modern applications (ZnO). In all these oxides, we identify oxygen vacancies as the origin for the creation of the 2DESs.In anatase and other doped d0 TMOs, both localized and itinerant electrons (2DES) can exist due to oxygen vacancies. Which of the two cases is energetically favorable depends on subtle differences as demonstrated by studying two polymorphs of the same material (anatase and rutile).In CaTiO3, the oxygen octahedron around the Ti ion is slightly tilted. This symmetry breaking results in the mixing of different d-orbitals demonstrating again why and how the electronic structure of the 2DES can be altered.In BaTiO3, the creation of a 2DES results in the coexistence of the two, usually mutual exclusive, phenomena of ferroelectricity and metallicity in the same material by spatially separating the two.Moreover, this work demonstrates that the 2DES also exists in ZnO which is - compared to the Ti-based oxides - rather a conventional semiconductor as the orbital character of the itinerant electrons is of s and not d-type.The main result of this thesis is the demonstration of a simple and versatile technique for the creation of 2DESs by evaporating Al on oxide surfaces. A redox reaction between metal and oxide results in a 2DES at the interface of the oxidized metal and the reduced oxide. In this thesis the study of such interfacial 2DESs was limited to photoemission studies in ultra high vacuum. However, this technique opens up the possibility to study 2DESs in functional oxides in ambient conditions by e.g. transport techniques, and might be an important step towards cost-efficient mass production of 2DESs in oxides for future applications.
Download or read book Physics Briefs written by and published by . This book was released on 1993 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Science, Proceedings of the 9th Interdisciplinary Surface Science Conference, 22-25 April 1991, Southampton, UK by : B. E. Hayden
Download or read book Surface Science, Proceedings of the 9th Interdisciplinary Surface Science Conference, 22-25 April 1991, Southampton, UK written by B. E. Hayden and published by CRC Press. This book was released on 1992 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The preparation and characterization of monolayer and multilayer films of organic molecules, physically and chemically absorbed on surfaces are discussed with special attention paid to the remarkable properties of Langmuir-Blodgett films. Dynamics of reactions at surfaces and details of the potential energy hypersurface (enabling absorption and reaction of molecules) are explored. A variety of techniques sensitive to local adsorbate structure are covered and compared with techniques which probe long-range order. Adsorption and reactions at semiconductor surfaces emphasizing fundamental studies using surface and/or gas analysis methods are covered. The relevance of this work to etching, chemical vapour and other deposition processes is highlighted. New techniques permitting the study of structure at the atomic level at condensed interfaces, as well as single molecular events are detailed.
Book Synopsis Spectroscopy of Complex Oxide Interfaces by : Claudia Cancellieri
Download or read book Spectroscopy of Complex Oxide Interfaces written by Claudia Cancellieri and published by Springer. This book was released on 2018-04-09 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the most recent and compelling experimental results for complex oxide interfaces. The results of this book were obtained with the cutting-edge photoemission technique at highest energy resolution. Due to their fascinating properties for new-generation electronic devices and the challenge of investigating buried regions, the book chiefly focuses on complex oxide interfaces. The crucial feature of exploring buried interfaces is the use of soft X-ray angle-resolved photoemission spectroscopy (ARPES) operating on the energy range of a few hundred eV to increase the photoelectron mean free path, enabling the photons to penetrate through the top layers – in contrast to conventional ultraviolet (UV)-ARPES techniques. The results presented here, achieved by different research groups around the world, are summarized in a clearly structured way and discussed in comparison with other photoemission spectroscopy techniques and other oxide materials. They are complemented and supported by the most recent theoretical calculations as well as results of complementary experimental techniques including electron transport and inelastic resonant X-ray scattering.
Book Synopsis Theoretical Modeling of Inorganic Nanostructures by : R. A. Evarestov
Download or read book Theoretical Modeling of Inorganic Nanostructures written by R. A. Evarestov and published by Springer Nature. This book was released on 2020-06-10 with total page 865 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the state of the art in the theoretical modeling of inorganic nanostructures. Extending the first edition, published in 2015, it presents applications to new nanostructured materials and theoretical explanations of recently discovered optical and thermodynamic properties of known nanomaterials. It discusses the developments in theoretical modeling of nanostructures, describing fundamental approaches such as symmetry analysis and applied calculation methods. The book also examines the theoretical aspects of many thermodynamic and the optical properties of nanostructures. The new edition includes additional descriptions of the theoretical modeling of nanostructures in novel materials such as the V2O5 binary oxide, ZnS, CdS, MoSSe and SnS2.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1978 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Book Synopsis Chemical Research Faculties by : American Chemical Society
Download or read book Chemical Research Faculties written by American Chemical Society and published by . This book was released on 1988 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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