Download or read book Quantum Critical Regimes Around the Metal Insulator Transition written by Yuting Tan and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-insulator transitions (MITs) remain one of the unresolved science problems of condensed-matter physics, which are rather general and of fundamental importance. In the vicinity of the MITs, the behavior is found to be unconventional and exotic. This complexity makes it difficult to recognize the dominant degrees of freedom, resulting in a plethora of theoretical viewpoints based on very different ideas. First we study the transport behavior and the dielectric response near Mott Metal-Insulator transition (MIT) using the Iterative Perturbation Theory (IPT), which is exact at the atomic limit at half-filling, for the single-band Hubbard model supplemented by percolation theory. We successfully interpret the experimental observation of a colossal peak of the dielectric function near the Mott MIT in organic material $\\\\kappa\\\\text{-(BEDT-TTF)}_2\\\\text{Cu}_2\\\\text{(CN)}_3$. Our results suggest the diverging feature of dielectric response comes from percolation effects near a first-order MIT, where metallic and insulator domains present simultaneously as long as the materials have defects or impurities. Our findings suggest a similar 'dielectric catastrophe' in many other correlated materials and can explain previous observations that were assigned to multiferroicity or ferroelectricity. Second we summarize both experimental and theoretical observations of the criticality around the Mott transition, in three types of systems: 2-dimensional electron gas (2DEG) in Si-MOSFE, Mott organic material ($\\\\kappa\\\\text{-(BEDT-TTF)}_2\\\\text{Cu}_2\\\\text{(CN)}_3$), and transition metal dichalcogenide (TMD) moire bilayer $\\\\text{MoTe}_2/\\\\text{WSe}_2$. Particularly, we find robust resistivity maxima are clearly seen in all these materials. We then use dynamical mean field theory (DMFT) and 'hybrid' DMFT correspondingly to show that dielectric response can be used to identify the origin of these resistivity maxima. We find that near the MIT, it corresponds to the percolation effect within the (spatially inhomogeneous) metal-insulator phase coexistence region, where a colossal enhancement of the dielectric response has been found. Deep in the metallic phase, it signals the thermal destruction of coherent quasiparticles due to strong correlation effects, and a dramatic drop and a change of sign in the dielectric constant would be found. Third we study the disorder dominated MIT in TMD moiré bilayer. In this material, a long-range geometric moiré pattern emerges when two atomically thin materials are misaligned or have a lattice mismatch. This drastically reduces the electronic kinetic energy, paving the way for new strongly correlated phases. We proposed a minimal theoretical model describing the interplay of interactions and disorder, which is solved at DMFT + coherent potential approximation (CPA) level. The results capture most experimental trends at almost a perfect level. We investigate the quantum criticality near MIT with a fully occupied flat band (f=2), which is found to be in a disorder-dominated regime. Finally, we consider long-range Coulomb interaction in low band filling cases, where one expects Wigner crystallization to occur. To investigate the nontrivial electronic phases appearing away from commensurate fillings, we first used the spinless Hartree method to calculate the total free energy, and then we used DMFT and Kubo formula to obtain the transport behavior. We find that, for most fillings, an amorphous charge-ordered metallic state - the electron slush - appears in strongly correlated TMD hetero-bilayers. Our results suggest performing transport and Scanning Tunneling Microscopy (STM) experiments on TMD hetero-bilayers to study the interplay between doping a Wigner-Mott insulator and amorphous charge order.
Download or read book Quantum critical Dynamics at the Metal Insulator Transition in a Disordered Alloy written by John Hok-Ling Lee and published by . This book was released on 1998 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conductor Insulator Quantum Phase Transitions written by Vladimir Dobrosavljevic and published by Oxford University Press. This book was released on 2012-06 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: When many particles come together how do they organize themselves? And what destroys this organization? Combining experiments and theory, this book describes intriguing quantum phases - metals, superconductors and insulators - and transitions between them. It captures the excitement and the controversies on topics at the forefront of research.
Download or read book Metal Insulator Transition in Two Dimensional Electron Systems written by Svetlana Anisimova and published by LAP Lambert Academic Publishing. This book was released on 2010-06 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interplay between strong electron-electron interactions and disorder has been a long-standing question in condensed matter physics. The discovery of the metal-insulator transition (MIT) in two-dimensional (2D) electron systems challenged one of the most influential theories of the last century which stated that "there is no true metallic state in 2D". However, the scaling theory of localization did not account for interactions between electrons. This book provides recent thermodynamic and transport experimental findings which indicate that MIT in 2D can be considered as a quantum phase transition. In the ballistic regime, strong interactions between carriers lead to Pauli spin susceptibility growing critically at low electron densities. Such behavior is characteristic in the close vicinity of a phase transition. In the immediate vicinity of the MIT, both the resistance and the effective interactions exhibit a fan-like spread as the MIT is crossed. A resistance-interaction flow diagram clearly reveals a quantum critical point. The book should be especially useful to graduate students, postdoctoral researches, or scientists working in the field of mesoscopic physics.
Download or read book Quantum Scaling in Many Body Systems written by Mucio Continentino and published by Cambridge University Press. This book was released on 2017-04-17 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum phase transitions are strongly relevant in a number of fields, ranging from condensed matter to cold atom physics and quantum field theory. This book, now in its second edition, approaches the problem of quantum phase transitions from a new and unifying perspective. Topics addressed include the concepts of scale and time invariance and their significance for quantum criticality, as well as brand new chapters on superfluid and superconductor quantum critical points, and quantum first order transitions. The renormalisation group in real and momentum space is also established as the proper language to describe the behaviour of systems close to a quantum phase transition. These phenomena introduce a number of theoretical challenges which are of major importance for driving new experiments. Being strongly motivated and oriented towards understanding experimental results, this is an excellent text for graduates, as well as theorists, experimentalists and those with an interest in quantum criticality.
Download or read book Quantum Scaling in Many Body Systems written by Mucio Continentino and published by Cambridge University Press. This book was released on 2017-04-17 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on experimental results, this updated edition approaches the problem of quantum phase transitions from a new and unifying perspective.
Download or read book High Magnetic Fields In Semiconductor Physics Proceedings Of The 16th International Conference written by Yong-jie Wang and published by World Scientific. This book was released on 2005-05-03 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume covers the latest research on high magnetic fields in semiconductor physics presented at the 16th International Conference (SemiMag 16), held in Tallahassee, Florida, August 2-8, 2004.The book features papers from more than 130 participants including the work of the foremost experts in the fields.Much of the most cutting-edge research is covered by the contributions as well as a special focused session on the recently discovered microwave-induced zero resistance effect.
Download or read book Quantum Scaling in Many body Systems written by Mucio Amado Continentino and published by World Scientific Publishing Company Incorporated. This book was released on 2001-01-01 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book on quantum phase transitions has been written by one of the pioneers in the application of scaling ideas to many-body systems -- a new and exciting subject that has relevance to many areas of condensed matter and theoretical physics. One of the few books on the subject, it emphasizes strongly correlated electronic systems. Although dealing with complex problems in statistical mechanics, it does not lose sight of the experiments and the actual physical systems which motivate the theoretical work. The book starts by presenting the scaling theory of quantum critical phenomena. Critical exponents for different systems are calculated using both the momentum space and real space renomalization group approaches. The former is developed without the use of Feynman diagrams, allowing nonspecialists to fully appreciate the underlying physics of this method. The case of heavy fermions as an example of systems close to a zero temperature phase transition is presented and discussed in detail. This is also the case of non-Fermi liquid behavior associated with a quantum critical point. Metal-insulator transitions are discussed within the scaling approach. The book ends with a discussion on first order quantum phase transitions, in particular those which occur due to a fluctuation-induced mechanism.
Download or read book Quantum Theory from Small to Large Scales written by Wojciech De Roeck and published by Oxford University Press. This book was released on 2012-05-24 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects lecture courses and seminars given at the Les Houches Summer School 2010 on "Quantum Theory: From Small to Large Scales". It reviews the state-of-the-art developments in this field by touching on different research topics from an interdisciplinary perspective.
Download or read book Advances in Organic Conductors and Superconductors written by Martin Dressel and published by MDPI. This book was released on 2018-10-04 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Advances in Organic Conductors and Superconductors" that was published in Crystals
Download or read book The Mott Metal Insulator Transition written by Florian Gebhard and published by Springer. This book was released on 2003-07-01 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Little do we reliably know about the Mott transition, and we are far from a complete understanding of the metal --insulator transition due to electr- electron interactions. Mott summarized his basic ideas on the subject in his wonderful book Metal--Insulator nansitions that first appeared in 1974 11. 1). In his view, a Motk insulator displays a gap for charge-carrying excitations due to electron cowelations, whose importance is expressed by the presence of local magnetic moments regardless of whether or not they are ordered. Since the subject is far from being settled, different opinions on specific aspects of the Mott transition still persist. This book naturally embodies my own understanding of the phenomenon, inspired by the work of the late Sir Kevill Mott. The purpose of this book is twofold: first, to give a detailed presen- tion of the basic theoretical concopts for Mott insulators and, second, to test these ideas against the results from model calculations. For this purpose the Hubbard model and some of its derivatives are best suited. The Hubbard model describes a Mott transition with a mere minimum of tunable par- eters, and various exact statements and even exact solutions exist in certain limiting cases. Exact solutions not only allow us to test our basic ideas, but also help to assess the quality of approxin~ate theories for correlated electron systems.
Download or read book Quantum Phase Transitions written by Subir Sachdev and published by Cambridge University Press. This book was released on 2001-04-23 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum Phase Transitions is the first book to describe in detail the fundamental changes that can occur in the macroscopic nature of matter at zero temperature due to small variations in a given external parameter. The subject plays a central role in the study of the electrical and magnetic properties of numerous important solid state materials. The author begins by developing the theory of quantum phase transitions in the simplest possible class of non-disordered, interacting systems - the quantum Ising and rotor models. Particular attention is paid to their non-zero temperature dynamic and transport properties in the vicinity of the quantum critical point. Several other quantum phase transitions of increasing complexity are then discussed and clarified. Throughout, the author interweaves experimental results with presentation of theoretical models, and well over 500 references are included. The book will be of great interest to graduate students and researchers in condensed matter physics.
Download or read book The Metal Nonmetal Transition Revisited written by P. Edwards and published by CRC Press. This book was released on 2018-10-08 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text surveys the various aspects of the fundamental problem related to the metallic and non-metallic states of matter, a question physicists have been studying for almost 100 years. The book poses questions and challenges in this area, as well as highlighting present understandings of the topic. Topics covered by the book include physics of dense ionized metal plasmas; metallic hydrogen; pressure-induced metallization; the M-I transition in doped semiconductors; transport studies in doped semiconductors near the metal-insulator transition; new results in old oxides; metal-insulator transition in 3d transition metal perovskite oxides investigated by high-energy spectroscopies; alkali metal-alkali halide melts; hopping conductivity in granular metals revisited; superconductor-insulator transition in cuprates; molecular metals and superconductors; shear induced chemical reactivity; shear, co-ordination and metallization; quantum diffusion and decoherence; the Mott transition; recent results, more and surprises; Mott-Hubbard-Anderson models.
Download or read book Quantum Chemical Studies of the Physics Around the Metal insulator Transition in EDO TTF 2PF6 written by Gerrit-Jan Linker and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book More is Different written by Nai-Phuan Ong and published by Princeton University Press. This book was released on 2020-10-06 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents articles written by leading experts surveying several major subfields in Condensed Matter Physics and related sciences. The articles are based on invited talks presented at a recent conference honoring Nobel laureate Philip W. Anderson of Princeton University, who coined the phrase "More is different" while formulating his contention that all fields of physics, indeed all of science, involve equally fundamental insights. The articles introduce and survey current research in areas that have been close to Anderson's interests. Together, they illustrate both the deep impact that Anderson has had in this multifaceted field during the past half century and the progress spawned by his insights. The contributors cover numerous topics under the umbrellas of superconductivity, superfluidity, magnetism, electron localization, strongly interacting electronic systems, heavy fermions, and disorder and frustration in glass and spin-glass systems. They also describe interdisciplinary areas such as the science of olfaction and color vision, the screening of macroions in electrolytes, scaling and renormalization in cosmology, forest fires and the spread of measles, and the investigation of "NP-complete" problems in computer science. The articles are authored by Philip W. Anderson, Per Bak and Kan Chen, G. Baskaran, Juan Carlos Campuzano, Paul Chaikin, John Hopfield, Bernhard Keimer, Scott Kirkpatrick and Bart Selman, Gabriel Kotliar, Patrick Lee, Yoshiteru Maeno, Marc Mezard, Douglas Osheroff et al., H. R. Ott, L. Pietronero et al., T. V. Ramakrishnan, A. Ramirez, Myriam Sarachik, T. Senthil and Matthew P. A. Fisher, B. I. Shklovskii et al., and F. Steglich et al.
Download or read book Quantum Dot Optoelectronic Devices written by Peng Yu and published by Springer Nature. This book was released on 2020-04-16 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book captures cutting-edge research in semiconductor quantum dot devices, discussing preparation methods and properties, and providing a comprehensive overview of their optoelectronic applications. Quantum dots (QDs), with particle sizes in the nanometer range, have unique electronic and optical properties. They have the potential to open an avenue for next-generation optoelectronic methods and devices, such as lasers, biomarker assays, field effect transistors, LEDs, photodetectors, and solar concentrators. By bringing together leaders in the various application areas, this book is both a comprehensive introduction to different kinds of QDs with unique physical properties as well as their preparation routes, and a platform for knowledge sharing and dissemination of the latest advances in a novel area of nanotechnology.
Download or read book Electronic and Structural Properties of LaNiO3 Based Heterostructures written by Jennifer Fowlie and published by Springer. This book was released on 2019-03-29 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis explores an amazing family of oxide compounds - the nickelates - known for their metal-to-insulator transition and, in the case of LaNiO3, to be a possible building block for designing a synthetic high Tc superconductor. Competition between various fascinating phases makes these materials very sensitive to external parameters and it is thus possible to dramatically tune their properties. This work on ultrathin LaNiO3 and the solid solution Nd1-xLaxNiO3 has important implications for the search for superconductivity in this class of materials.
