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This thesis presents analytical theoretical studies on the interplay between charge density waves (CDW) and superconductivity (SC) in the actively studied transition-metal dichalcogenide 1T-TiSe2. It begins by reapproaching a years-long debate over the nature of the phase transition to the commensurate CDW (CCDW) state and the role played by the intrinsic tendency towards excitonic condensation in this system. A Ginzburg-Landau phenomenological theory was subsequently developed to understand the experimentally observed transition from commensurate to incommensurate CDW (ICDW) order with doping or pressure, and the emergence of a superconducting dome that coexists with ICDW. Finally, to characterize microscopically the effects of the interplay between CDW and SC, the spectrum of CDW fluctuations beyond mean-field was studied in detail. In the aggregate, the work reported here provides an encompassing understanding of what are possibly key microscopic underpinnings of the CDW and SC physics in TiSe2.
Book Synopsis On the Nature of Charge Density Waves, Superconductivity and Their Interplay in 1T-TiSe2 by : Chuan Chen
Download or read book On the Nature of Charge Density Waves, Superconductivity and Their Interplay in 1T-TiSe2 written by Chuan Chen and published by Springer Nature. This book was released on 2019-09-27 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents analytical theoretical studies on the interplay between charge density waves (CDW) and superconductivity (SC) in the actively studied transition-metal dichalcogenide 1T-TiSe2. It begins by reapproaching a years-long debate over the nature of the phase transition to the commensurate CDW (CCDW) state and the role played by the intrinsic tendency towards excitonic condensation in this system. A Ginzburg-Landau phenomenological theory was subsequently developed to understand the experimentally observed transition from commensurate to incommensurate CDW (ICDW) order with doping or pressure, and the emergence of a superconducting dome that coexists with ICDW. Finally, to characterize microscopically the effects of the interplay between CDW and SC, the spectrum of CDW fluctuations beyond mean-field was studied in detail. In the aggregate, the work reported here provides an encompassing understanding of what are possibly key microscopic underpinnings of the CDW and SC physics in TiSe2.
This thesis presents analytical theoretical studies on the interplay between charge density waves (CDW) and superconductivity (SC) in the actively studied transition-metal dichalcogenide 1T-TiSe2. It begins by reapproaching a years-long debate over the nature of the phase transition to the commensurate CDW (CCDW) state and the role played by the intrinsic tendency towards excitonic condensation in this system. A Ginzburg-Landau phenomenological theory was subsequently developed to understand the experimentally observed transition from commensurate to incommensurate CDW (ICDW) order with doping or pressure, and the emergence of a superconducting dome that coexists with ICDW. Finally, to characterize microscopically the effects of the interplay between CDW and SC, the spectrum of CDW fluctuations beyond mean-field was studied in detail. In the aggregate, the work reported here provides an encompassing understanding of what are possibly key microscopic underpinnings of the CDW and SC physics in TiSe2.
Book Synopsis On the Nature of Charge Density Waves, Superconductivity and Their Interplay in 1T-TiSe2 by : Chuan Chen
Download or read book On the Nature of Charge Density Waves, Superconductivity and Their Interplay in 1T-TiSe2 written by Chuan Chen and published by . This book was released on 2019 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents analytical theoretical studies on the interplay between charge density waves (CDW) and superconductivity (SC) in the actively studied transition-metal dichalcogenide 1T-TiSe2. It begins by reapproaching a years-long debate over the nature of the phase transition to the commensurate CDW (CCDW) state and the role played by the intrinsic tendency towards excitonic condensation in this system. A Ginzburg-Landau phenomenological theory was subsequently developed to understand the experimentally observed transition from commensurate to incommensurate CDW (ICDW) order with doping or pressure, and the emergence of a superconducting dome that coexists with ICDW. Finally, to characterize microscopically the effects of the interplay between CDW and SC, the spectrum of CDW fluctuations beyond mean-field was studied in detail. In the aggregate, the work reported here provides an encompassing understanding of what are possibly key microscopic underpinnings of the CDW and SC physics in TiSe2.
?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.
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.
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 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 Emergence of Charge Density Wave Domain Walls Above the Superconducting Dome in TiSe2 by :
Download or read book Emergence of Charge Density Wave Domain Walls Above the Superconducting Dome in TiSe2 written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
At low temperatures, the electronic structure of metals becomes unstable, and instabilities often develop correlated electronic states, decreasing the number of free carriers. One of these correlated states is a charge density wave state. It usually arises under the interaction of free carriers with phonons, and it is manifested as a superstructure over the original crystal lattice. The charge density wave state presents distinguishable experimental fingerprints in many physical properties of the crystal, spontaneously breaking its translational symmetry. The physics of the charge density wave is well established in the case of a one-dimensional metal; however, there are lot of open issues, when describing the systems of higher dimensions. The charge density wave state could potentially be utilized in low-energy electronic devices. Transition metal dichalcogenides are quasi two-dimensional materials, that exhibit a correlated electronic behavior, such as the superconductivity and the charge density wave. Due to their simple crystalline structures, nearly perfect crystals can be grown, and the electronic correlations can be studied in the absence of any disorder. An example of this class of materials is 2H-NbSe2, that undergoes both the charge density wave (T_CDW=33.5 K) and superconducting (T_SC=7.2 K) transitions. The first part of this work is focused on the single crystal growth, electronic transport characterization, and results of ultrafast transient reflectivity measurements of 2H-NbSe2 single crystals. Coherent lattice dynamics and characteristic relaxation times of photoexcited charge carriers have been extracted from the broadband transient optical spectroscopy. A wide temporal profile gives opportunity to track multiple ultrafast phenomena within the same experiment from 50 fs to few nanoseconds. The physical mechanisms leading to the charge density wave condensation are being discussed here. The second part of this work is focused on a studying of the temperature hysteresis in electrical transport properties in freshly grown undoped and doped 1T-TiSe2 single crystals. This transition metal dichalcogenide undergoes a chiral charge density wave at low temperatures (T_CDW=202 K). An irreversible behavior of electrical properties upon the thermocycling indicates an existence of metastable states in the charge density wave phase, and it is commonly attributed to additional phase transitions. The absence of strong experimental evidence of these transitions is collaborated with an opened dispute on the nature of charge density wave state in this material. Physical origins of this phenomenon, including a complex charge density wave domain structure of 1T-TiSe2, are being discussed in the second part of the work.
Book Synopsis Charge Density Waves in 2D Transition Metal Dichalcogenides by : Anton A. Anikin
Download or read book Charge Density Waves in 2D Transition Metal Dichalcogenides written by Anton A. Anikin and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: At low temperatures, the electronic structure of metals becomes unstable, and instabilities often develop correlated electronic states, decreasing the number of free carriers. One of these correlated states is a charge density wave state. It usually arises under the interaction of free carriers with phonons, and it is manifested as a superstructure over the original crystal lattice. The charge density wave state presents distinguishable experimental fingerprints in many physical properties of the crystal, spontaneously breaking its translational symmetry. The physics of the charge density wave is well established in the case of a one-dimensional metal; however, there are lot of open issues, when describing the systems of higher dimensions. The charge density wave state could potentially be utilized in low-energy electronic devices. Transition metal dichalcogenides are quasi two-dimensional materials, that exhibit a correlated electronic behavior, such as the superconductivity and the charge density wave. Due to their simple crystalline structures, nearly perfect crystals can be grown, and the electronic correlations can be studied in the absence of any disorder. An example of this class of materials is 2H-NbSe2, that undergoes both the charge density wave (T_CDW=33.5 K) and superconducting (T_SC=7.2 K) transitions. The first part of this work is focused on the single crystal growth, electronic transport characterization, and results of ultrafast transient reflectivity measurements of 2H-NbSe2 single crystals. Coherent lattice dynamics and characteristic relaxation times of photoexcited charge carriers have been extracted from the broadband transient optical spectroscopy. A wide temporal profile gives opportunity to track multiple ultrafast phenomena within the same experiment from 50 fs to few nanoseconds. The physical mechanisms leading to the charge density wave condensation are being discussed here. The second part of this work is focused on a studying of the temperature hysteresis in electrical transport properties in freshly grown undoped and doped 1T-TiSe2 single crystals. This transition metal dichalcogenide undergoes a chiral charge density wave at low temperatures (T_CDW=202 K). An irreversible behavior of electrical properties upon the thermocycling indicates an existence of metastable states in the charge density wave phase, and it is commonly attributed to additional phase transitions. The absence of strong experimental evidence of these transitions is collaborated with an opened dispute on the nature of charge density wave state in this material. Physical origins of this phenomenon, including a complex charge density wave domain structure of 1T-TiSe2, are being discussed in the second part of the work.
This book presents advanced synthesis techniques adopted to fabricate two-dimensional (2D) transition metal dichalcogenides (TMDs) materials with its enhanced properties towards their utilization in various applications such as, energy storage devices, photovoltaics, electrocatalysis, electronic devices, photocatalysts, sensing and biomedical applications. It provides detailed coverage on everything from the synthesis and properties to the applications and future prospects of research in 2D TMD nanomaterials.
Book Synopsis Two Dimensional Transition Metal Dichalcogenides by : Narayanasamy Sabari Arul
Download or read book Two Dimensional Transition Metal Dichalcogenides written by Narayanasamy Sabari Arul and published by Springer. This book was released on 2019-07-30 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents advanced synthesis techniques adopted to fabricate two-dimensional (2D) transition metal dichalcogenides (TMDs) materials with its enhanced properties towards their utilization in various applications such as, energy storage devices, photovoltaics, electrocatalysis, electronic devices, photocatalysts, sensing and biomedical applications. It provides detailed coverage on everything from the synthesis and properties to the applications and future prospects of research in 2D TMD nanomaterials.
This book reviews the structure and electronic, magnetic, and other properties of various MoS2 (Molybdenum disulfide) nanostructures, with coverage of synthesis, Valley polarization, spin physics, and other topics. MoS2 is an important, graphene-like layered nano-material that substantially extends the range of possible nanostructures and devices for nanofabrication. These materials have been widely researched in recent years, and have become an attractive topic for applications such as catalytic materials and devices based on field-effect transistors (FETs) and semiconductors. Chapters from leading scientists worldwide create a bridge between MoS2 nanomaterials and fundamental physics in order to stimulate readers' interest in the potential of these novel materials for device applications. Since MoS2 nanostructures are expected to be increasingly important for future developments in energy and other electronic device applications, this book can be recommended for Physics and Materials Science and Engineering departments and as reference for researchers in the field.
Book Synopsis MoS2 by : Zhiming M. Wang
Download or read book MoS2 written by Zhiming M. Wang and published by Springer Science & Business Media. This book was released on 2013-11-18 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the structure and electronic, magnetic, and other properties of various MoS2 (Molybdenum disulfide) nanostructures, with coverage of synthesis, Valley polarization, spin physics, and other topics. MoS2 is an important, graphene-like layered nano-material that substantially extends the range of possible nanostructures and devices for nanofabrication. These materials have been widely researched in recent years, and have become an attractive topic for applications such as catalytic materials and devices based on field-effect transistors (FETs) and semiconductors. Chapters from leading scientists worldwide create a bridge between MoS2 nanomaterials and fundamental physics in order to stimulate readers' interest in the potential of these novel materials for device applications. Since MoS2 nanostructures are expected to be increasingly important for future developments in energy and other electronic device applications, this book can be recommended for Physics and Materials Science and Engineering departments and as reference for researchers in the field.
A series of high-pressure electrical resistivity measurements on single crystals of TbTe3 reveal a complex phase diagram involving the interplay of superconducting, antiferromagnetic and charge density wave order. The onset of superconductivity reaches a maximum of almost 4 K (onset) near ≈ 12.4 GPa.
Book Synopsis Pressure Induced Superconductivity in the Charge Density Wave Compound Tritelluride by :
Download or read book Pressure Induced Superconductivity in the Charge Density Wave Compound Tritelluride written by and published by . This book was released on 2010 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of high-pressure electrical resistivity measurements on single crystals of TbTe3 reveal a complex phase diagram involving the interplay of superconducting, antiferromagnetic and charge density wave order. The onset of superconductivity reaches a maximum of almost 4 K (onset) near ≈ 12.4 GPa.
Superconductivity in materials without inversion symmetry in the respective crystal structures occurs in the presence of antisymmetric spin-orbit coupling as a consequence of an emerging electric field gradient. The superconducting condensate is then a superposition of spin-singlet and spin-triplet Cooper pairs. This scenario accounts for various experimental findings such as nodes in the superconducting gap or extremely large upper critical magnetic fields. Spin-triplet pairing can occur in non-centrosymmetric superconductors in spite of Anderson’s theorem that spin-triplet pairing requires a crystal structure that exhibits inversion symmetry. This book, authored and edited by leading researchers in the field, is both an introduction to and overview on this exciting branch of novel superconductors. Its self-contained and tutorial style makes it particularly suitable for self-study and as source of teaching material for special seminars and courses. At the same time it constitutes an up-to-date and authoritative reference for anyone working in this exciting field.
Book Synopsis Non-Centrosymmetric Superconductors by : Ernst Bauer
Download or read book Non-Centrosymmetric Superconductors written by Ernst Bauer and published by Springer Science & Business Media. This book was released on 2012-01-10 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconductivity in materials without inversion symmetry in the respective crystal structures occurs in the presence of antisymmetric spin-orbit coupling as a consequence of an emerging electric field gradient. The superconducting condensate is then a superposition of spin-singlet and spin-triplet Cooper pairs. This scenario accounts for various experimental findings such as nodes in the superconducting gap or extremely large upper critical magnetic fields. Spin-triplet pairing can occur in non-centrosymmetric superconductors in spite of Anderson’s theorem that spin-triplet pairing requires a crystal structure that exhibits inversion symmetry. This book, authored and edited by leading researchers in the field, is both an introduction to and overview on this exciting branch of novel superconductors. Its self-contained and tutorial style makes it particularly suitable for self-study and as source of teaching material for special seminars and courses. At the same time it constitutes an up-to-date and authoritative reference for anyone working in this exciting field.
