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Author: Karina Helena Gezina Schulte
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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Book Description
Author: Karina Helena Gezina Schulte
Publisher:
ISBN:
Category :
Languages : en
Pages : 172
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Book Description
Author: Cheng-Chien Chen
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Strongly correlated systems exhibit novel phenomena such as superconductivity and magnetism that arise from the interplay between many intertwined degrees of freedom. In this dissertation I discuss my work using state-of-the-art exact diagonalization simulations in attempts to understand the physics of correlated materials via their response to various experimental probes. I first discuss simulating x-ray absorption spectra to extract crucial information regarding correlation effects in iron-based superconductors and the pressure-induced phase transitions in hematite. I then discuss modeling resonant inelastic x-ray scattering spectra of the cuprate superconductors and studying the orbital characters of the excitation profiles. Following the discussion of photon-based spectroscopies, I then shift the focus to magnetic properties of iron-based superconductors. I will discuss a possible orbital ordering scenario in connection with the orthorhombic anisotropies observed in neutron scattering, transport, and other spectroscopic experiments performed on these materials. At the end of the dissertation, I examine the role of magnetic frustration and demonstrate how the response of antiferromagnets to non-magnetic impurities and magnetic Raman scattering can reveal the degree of frustration and help narrow the possible models for the iron-pnictide materials.
Author: Adolfo Avella
Publisher: Springer
ISBN: 3662441330
Category : Science
Languages : en
Pages : 329
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Book Description
The continuous evolution and development of experimental techniques is at the basis of any fundamental achievement in modern physics. Strongly correlated systems (SCS), more than any other, need to be investigated through the greatest variety of experimental techniques in order to unveil and crosscheck the numerous and puzzling anomalous behaviors characterizing them. The study of SCS fostered the improvement of many old experimental techniques, but also the advent of many new ones just invented in order to analyze the complex behaviors of these systems. Many novel materials, with functional properties emerging from macroscopic quantum behaviors at the frontier of modern research in physics, chemistry and materials science, belong to this class of systems. The volume presents a representative collection of the modern experimental techniques specifically tailored for the analysis of strongly correlated systems. Any technique is presented in great detail by its own inventor or by one of the world-wide recognized main contributors. The exposition has a clear pedagogical cut and fully reports on the most relevant case study where the specific technique showed to be very successful in describing and enlightening the puzzling physics of a particular strongly correlated system. The book is intended for advanced graduate students and post-docs in the field as textbook and/or main reference, but also for any other researcher in the field who appreciates consulting a single, but comprehensive, source or wishes to get acquainted, in a as painless as possible way, with the working details of a specific technique.
Author: Amrit Raj Pokharel
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Strongly correlated materials are systems for which the complex interplay among the electrons, spin and lattice lead to the formation of different phase transitions and new orders with dramatically different electrical, optical, mechanical and thermal properties. Emergence of complex phases like- Charge Density Wave (CDW), Spin Density Wave (SDW), Superconductivity just to name a few, with remarkable properties offer great deal (such as an order of magnitude change in electrical conductivity) from fundamental research perspective and thought to shape our future technologies. Non-equilibrium spectroscopic techniques are ideal tools to investigate such correlated systems as the techniques offer simulta- neous spectroscopic and temporal information. In addition, driving the system out of equilibrium and tracking the relaxation dynamics and their couplings, one can disentangle the different degrees of freedom because of the different timescales that characterize the recovery of the initial ground state. The work described in this thesis utilizes the ultrafast spectroscopic tech- nique as a tool to investigate the solid state materials exhibiting Charge Density Wave (CDW) order, Kondo Insulating (KI) behavior and Mott Insulating (MI) ground state. All of these materials fall into the category of strongly correlated systems where multiple phases emerges due to correlation effects. In the Kondo Insulator YbB12 we track the photo-induced reflectivity dynamics at various temperatures and excitation densities and discuss the corresponding changes in the ow energy electronic structure. In CDW system BaNi2As2 we study the collec- tive amplitude modes of the CDW order and their temperature and excitation density dependence. These results provide valuable information on the nature of the CDW order and its relation to the observed structural phase transitions. In particular, the smooth evolution of several amplitude modes through the struc- tural phase transitions suggest that CDW may be responsible for the triclinic phase transition. Moreover, robustness of the CDW order against perturbation suggest an unconventional, non-Peierls nature of the CDW order. Last, but not least, we present the time-resolved study on photo-doping the Mott insulator La2CuO4. By tracking the time evolution of the complex dielectric function over the broad spectral range, we study the dynamics of the charge transfer gap and the appearance of the mid-infrared excitations. By varying the excitation densi- ties over three order of magnitude we demonstrate the extreme resilience of the Mott insulating ground state against perturbation.
Author: Jamal Berakdar
Publisher: John Wiley & Sons
ISBN: 3527606491
Category : Science
Languages : en
Pages : 255
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Book Description
Here, leading scientists present an overview of the most modern experimental and theoretical methods for studying electronic correlations on surfaces, in thin films and in nanostructures. In particular, they describe in detail coincidence techniques for studying many-particle correlations while critically examining the informational content of such processes from a theoretical point viewpoint. Furthermore, the book considers the current state of incorporating many-body effects into theoretical approaches. Covered topics: -Auger-electron photoelectron coincidence experiments and theories -Correlated electron emission from atoms, fullerens, clusters, metals and wide-band gap materials -Ion coincidence spectroscopies and ion scattering theories from surfaces -GW and dynamical mean-field approaches -Many-body effects in electronic and optical response
Author: Andrew T. S. Wee
Publisher: John Wiley & Sons
ISBN: 3527833951
Category : Technology & Engineering
Languages : en
Pages : 213
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Book Description
A one-of-a-kind text offering an introduction to the use of spectroscopic ellipsometry for novel material characterization In Introduction to Spectroscopic Ellipsometry of Thin Film Materials: Instrumentation, Data Analysis and Applications, a team of eminent researchers delivers an incisive exploration of how the traditional experimental technique of spectroscopic ellipsometry is used to characterize the intrinsic properties of novel materials. The book focuses on the scientifically and technologically important two-dimensional transition metal dichalcogenides (2D-TMDs), magnetic oxides like manganite materials, and unconventional superconductors, including copper oxide systems. The distinguished authors discuss the characterization of properties, like electronic structures, interfacial properties, and the consequent quasiparticle dynamics in novel quantum materials. Along with illustrative and specific case studies on how spectroscopic ellipsometry is used to study the optical and quasiparticle properties of novel systems, the book includes: Thorough introductions to the basic principles of spectroscopic ellipsometry and strongly correlated systems, including copper oxides and manganites Comprehensive explorations of two-dimensional transition metal dichalcogenides Practical discussions of single layer graphene systems and nickelate systems In-depth examinations of potential future developments and applications of spectroscopic ellipsometry Perfect for master’s- and PhD-level students in physics and chemistry, Introduction to Spectroscopic Ellipsometry of Thin Film Materials will also earn a place in the libraries of those studying materials science seeking a one-stop reference for the applications of spectroscopic ellipsometry to novel developed materials.
Author: Prabhakar Misra
Publisher: John Wiley & Sons
ISBN: 3527349375
Category : Technology & Engineering
Languages : en
Pages : 532
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Book Description
Spectroscopy and Characterization of Nanomaterials and Novel Materials Comprehensive overview of nanomaterial characterization methods and applications from leading researchers in the field In Spectroscopy and Characterization of Nanomaterials and Novel Materials: Experiments, Modeling, Simulations, and Applications, the editor Prabhakar Misra and a team of renowned contributors deliver a practical and up-to-date exploration of the characterization and applications of nanomaterials and other novel materials, including quantum materials and metal clusters. The contributions cover spectroscopic characterization methods for obtaining accurate information on optical, electronic, magnetic, and transport properties of nanomaterials. The book reviews nanomaterial characterization methods with proven relevance to academic and industry research and development teams, and modern methods for the computation of nanomaterials’ structure and properties - including machine-learning approaches - are also explored. Readers will also find descriptions of nanomaterial applications in energy research, optoelectronics, and space science, as well as: A thorough introduction to spectroscopy and characterization of graphitic nanomaterials and metal oxides Comprehensive explorations of simulations of gas separation by adsorption and recent advances in Weyl semimetals and axion insulators Practical discussions of the chemical functionalization of carbon nanotubes and applications to sensors In-depth examinations of micro-Raman imaging of planetary analogs Perfect for physicists, materials scientists, analytical chemists, organic and polymer chemists, and electrical engineers, Spectroscopy and Characterization of Nanomaterials and Novel Materials: Experiments, Modeling, Simulations, and Applications will also earn a place in the libraries of sensor developers and computational physicists and modelers.
Author: Xiaoqiang Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 97
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Book Description
Author: Volodymyr Turkowski
Publisher: Springer Nature
ISBN: 3030649040
Category : Technology & Engineering
Languages : en
Pages : 393
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Book Description
This is the first book that provides a detailed summary of one of the most successful new condensed matter theories - dynamical mean-field theory (DMFT) - in both static and dynamical cases of systems of different sizes. DMFT is one of the most successful approaches to describe the physical properties of systems with strong electron-electron correlations such as bulk materials, multi-layers, surfaces, 2D materials and nanostructures in both metallic and insulating phases. Strongly correlated materials usually include partially-filled localized d- or f-orbitals, and DMFT takes into account crucial for these systems time-resolved interaction between electrons when they “meet” on one atom and occupy one of these orbitals. The First Part of the book covers the general formalism of DMFT as a many-body theory, followed by generalizations of the approach on the cases of finite systems and out-of-equilibrium regime. In the last Chapter of the First Part we discuss generalizations of the approach on the case when the non-local interactions are taken into account. The Second Part of the book covers methodologies of merging DMFT with ab initio static Density Functional Theory (DFT) and Time-Dependent DFT (TDDFT) approaches. Such combined DFT+DMFT and DMFT+TDDFT computational techniques allow one to include the effects of strong electron-electron correlations at the accurate ab initio level. These tools can be applied to complex multi-atom multi-orbital systems currently not accessible to DMFT. The book helps broad audiences of students and researchers from the theoretical and computational communities of condensed matter physics, material science, and chemistry to become familiar with this state-of-art approach and to use it for reaching a deeper understanding of the properties of strongly correlated systems and for synthesis of new technologically-important materials.
Author: Adolfo Avella
Publisher: Springer Science & Business Media
ISBN: 3642218318
Category : Science
Languages : en
Pages : 487
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Book Description
The volume presents, for the very first time, an exhaustive collection of those modern theoretical methods specifically tailored for the analysis of Strongly Correlated Systems. Many novel materials, with functional properties emerging from macroscopic quantum behaviors at the frontier of modern research in physics, chemistry and materials science, belong to this class of systems. Any technique is presented in great detail by its own inventor or by one of the world-wide recognized main contributors. The exposition has a clear pedagogical cut and fully reports on the most relevant case study where the specific technique showed to be very successful in describing and enlightening the puzzling physics of a particular strongly correlated system. The book is intended for advanced graduate students and post-docs in the field as textbook and/or main reference, but also for other researchers in the field who appreciates consulting a single, but comprehensive, source or wishes to get acquainted, in a as painless as possible way, with the working details of a specific technique.
