Electronic Band Structure Engineering And Ultrafast Dynamics Of Dirac Semimetals
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Electronic Band Structure Engineering And Ultrafast Dynamics Of Dirac Semimetals
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Author : Changhua Bao
language : en
Publisher: Springer Nature
Release Date : 2023-11-24
Electronic Band Structure Engineering And Ultrafast Dynamics Of Dirac Semimetals written by Changhua Bao and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-11-24 with Science categories.
This book highlights the doctoral research of the author on electronic band structure engineering and ultrafast dynamics of Dirac semimetals. Dirac semimetals exhibit unique electronic band structure and novel physical properties with rich light-matter interaction, which inspires a wide range of potential applications. Enabling band engineering and revealing ultrafast dynamics of Dirac semimetals is therefore important. In the research work covered by the book, the first ultrafast time- and angle-resolved photoemission spectroscopy with tunable probe photon energy is developed, providing new opportunities for exploring ultrafast dynamics in 3D quantum materials. Using the spectroscopy, the author investigates the band structure engineering and ultrafast dynamics of Dirac semimetals, realizing the long-sought-after chiral symmetry breaking in a Kekulé-ordered graphene with flat band and revealing the ultrafast dynamics of Dirac fermions in 3D Dirac semimetal for the first time. The work advances the research of the electronic structure of Dirac semimetals in two aspects. Firstly, it identifies the Kekulé-ordered graphene as a new system for exploring chiral symmetry breaking- related physics and flat band- induced instability, providing a very rare system to investigate their interplay. Secondly, it solves the long-standing challenge of directly visualizing the non-equilibrium electronic structure of 3D Dirac semimetal and opens up new opportunities for exploring the light-matter interaction in 3D quantum materials, especially the light-induced topological phase transitions in 3D topological materials.
Electronic Band Structure Engineering And Ultrafast Dynamics Of Dirac Semimetals
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Author : 鲍昌华
language : en
Publisher:
Release Date : 2024
Electronic Band Structure Engineering And Ultrafast Dynamics Of Dirac Semimetals written by 鲍昌华 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024 with Condensed matter categories.
Emergent States In Photoinduced Charge Density Wave Transitions
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Author : Alfred Zong
language : en
Publisher: Springer Nature
Release Date : 2021-09-17
Emergent States In Photoinduced Charge Density Wave Transitions written by Alfred Zong and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-09-17 with Science categories.
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.
Encyclopedia Of Physical Science And Technology
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Author :
language : en
Publisher:
Release Date : 1992
Encyclopedia Of Physical Science And Technology written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Physical sciences categories.
Band Structure Engineering In Semiconductor Microstructures
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Author : R.A. Abram
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Band Structure Engineering In Semiconductor Microstructures written by R.A. Abram and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
This volume contains the proceedings of the NATO Advanced Research Workshop on Band Structure Engineering in Semiconductor Microstructures held at Il Ciocco, Castelvecchio Pascali in Tuscany between 10th and 15th April 1988. Research on semiconductor microstructures has expanded rapidly in recent years as a result of developments in the semiconductor growth and device fabrication technologies. The emergence of new semiconductor structures has facilitated a number of approaches to producing systems with certain features in their electronic structure which can lead to useful or interesting properties. The interest in band structure engineering has stimd ated a variety of physical investigations and nove 1 device concepts and the field now exhibits a fascinating interplay betwepn pure physics and device technology. Devices based on microstruc tures are useful vehicles for fundamental studies but also new device ideas require a thorough understanding of the basic physics. Around forty researchers gathered at I1 Ciocco in the Spring of 1988 to discuss band structure engineering in semiconductor microstructures.
Electronic Properties Of Dirac And Weyl Semimetals
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Author : Eduard V Gorbar
language : en
Publisher: World Scientific
Release Date : 2021-01-04
Electronic Properties Of Dirac And Weyl Semimetals written by Eduard V Gorbar and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-01-04 with Science categories.
The monograph reviews various aspects of electronic properties of Dirac and Weyl semimetals. After a brief discussion of 2D Dirac semimetals, a comprehensive review of 3D materials is given. The description starts from an overview of the topological properties and symmetries of Dirac and Weyl semimetals. In addition, several low-energy models of Dirac and Weyl quasiparticles are presented. The key ab initio approaches and material realizations are given. The monograph includes detailed discussions of the surface Fermi arcs, anomalous transport properties, and collective modes of Dirac and Weyl semimetals. Superconductivity in these materials is briefly addressed.
Probing The Electronic Structure Of New 3d Dirac Semimetals
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Author : Andreas Topp
language : en
Publisher:
Release Date : 2019
Probing The Electronic Structure Of New 3d Dirac Semimetals written by Andreas Topp and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Ultrafast Studies Of Electron Dynamics At Metal Dielectric Interfaces
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Author : Nien-Hui Ge
language : en
Publisher:
Release Date : 1998
Ultrafast Studies Of Electron Dynamics At Metal Dielectric Interfaces written by Nien-Hui Ge and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Dirac And Weyl Semimetals For Novel Device Applications
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Author : Niraj Bhattarai
language : en
Publisher:
Release Date : 2022
Dirac And Weyl Semimetals For Novel Device Applications written by Niraj Bhattarai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Much fundamental research in condensed matter physics has been driven by the tremendous influence of high-energy physics. In 1928, Paul Dirac laid a strong foundation in the unification of quantum mechanics and relativistic physics in explaining the nature of the electron. The key idea of Dirac's equation was to describe relativistic particles like Dirac and Weyl fermions in high-energy physics. After the discovery of topological insulators (ordinary insulators in the bulk state but allowing charge to flow on their surfaces) in the early 1980s, the search for new topological semimetals such as Dirac and Weyl mushroomed over the recent decades in condensed matter physics. Dirac and Weyl semimetals host Dirac and Weyl fermions respectively in the form of low-energy excitations and are characterized by band-touching points with linear dispersion similar to massless relativistic particles predicted in high-energy physics.The smallest feature size of current silicon-based advanced microelectronic devices is around 4 nm and the rate of development of current microelectronics has slowed down as silicon appears to have reached its physical limit. Industries are looking for alternatives to silicon-based technology. The discovery of Dirac and Weyl semimetals paves the way for developing new forms of microelectronics. These materials offer nearly dissipationless current and that could dramatically speed up the performance and efficiency of modern electronic devices. Weyl semimetals are also known for exhibiting exotic low energy physics such as Fermi arcs on the surface, distinct magneto-transport properties, and chiral anomaly-induced quantum transport. Such exotic properties of Weyl semimetals are useful for making new types of electronic devices such as broadband photodetectors, light-emitting diodes, biosensors, and superfast quantum computers capable of parsing multi-state superposition. While the promise of Dirac and Weyl semimetal is clear, the practical integration of such systems into everyday devices depends on a thorough understanding of the materials at the nanoscale. In my dissertation research, I have grown nanofilms of three different systems - LaAlGe, MoTe2, and FeSn, of which the former two are examples of Weyl semimetal and later is a Dirac semimetal. For the first time, high-quality thin films for LaAlGe and FeSn have been grown using the ultra-high vacuum molecular beam epitaxy method. I have shown that these systems can be grown on silicon substrates, which can be directly used for multifunctional device applications. I have systematically investigated the electrical transport and magneto-transport properties of these systems to understand the underlying physics, especially non-saturating magnetoresistance due to perfect electron and hole carrier balance up to a very high magnetic field. Not only are these new systems extremely important for our understanding of fundamental quantum phenomena, but also, they exhibit completely different transport phenomena from ordinary materials. Dirac semimetals also exhibit non-saturating extremely large magnetoresistance as a consequence of their robust electronic bands being protected by time-reversal symmetry. These open undeniably new possibilities for materials engineering and applications including quantum computing.
Electronic Band Structure And Its Applications
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Author : Mohammed Yussouff
language : en
Publisher: Springer
Release Date : 1987
Electronic Band Structure And Its Applications written by Mohammed Yussouff and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Science categories.
This volume gives an up-to-date overview of theoretical and experimental methods of studying the electronic band structure. Various formalisms for explicit calculations and many details of useful applications, particularly to alloys and semiconductors, are presented. The contributions cover the following subjects: alloy phase diagrams, density functionals; disordered alloys; heavy fermions; impurities in metals and semiconductors; linearize band structure calculations; magnetism in alloys; modern theory of alloy band structure; momentum densities in metals and alloys; photoemission; quasi-particles and properties of semiconductors; the recursion method and transport properties of crystals and quasi-crystals.