Quantum phase transitions occur as a result of competing ground state. Pdf interaction effects and quantum phase transitions in. Solidstate physics intermediate bosonic metallic state in. As the applied magnetic field is increased further, a series of quantum phase transitions within the fisdw states occurs 22,23,24. Outstanding examples are high t c critical temperature cuprates and manganites exhibiting colossal magnetoresistance. By considering the nearestneighbor, nextnearestneighbor hopping parameters and the staggeredflux parameter of the haldane model, we can obtain rich topological quantum phases. A material that can switch from an insulator to conducting electricity like a metal without moving its atoms could dramatically improve the switching speeds of advanced devices, says eom. Superconductorinsulator transitions in ultrathin apb. The chapters in this book give insights into how a coherent metallic or superconducting state can be driven into an incoherent insulating state by increasing disorder, magnetic field, carrier. Topological quantum phase transitions tqpts and topological states of matters have attracted a lot attention in recent years. It must be understood that superconductivity is not merely an extrapolation of most conductors tendency to gradually lose resistance with decreasing temperature. Spin effects near the superconductorinsulator transition.
Combining experiments and theory, this book describes intriguing quantum phases metals. Across the critical point, a topological quantum phase transition is revealed through both angleresolved photoemission measurements and density functional theory calculations. Pdf quantum phase transition from axion insulator to. We present a complete description of a zero temperature phase transition between.
Conductor insulator quantum phase transitions oxford. Twodimensional superconductorinsulator quantum phase. All the electrons in a metal cooperate to form a single quantum state. Phase transition between the quantum spin hall and insulator phases in 3d 2 1. Metalinsulator transition a quantum phase transition. In the first case, the substance is called an insulator, and in the second case a metal.
Focuses on intriguing quantum phases and transitions in metals, superconductors, and insulators. Our setup thus realizes, as we change the chemical potential, an insulatortosuperconductor quantum phase transition. Conductor insulator quantum phase transitions vladimir. Recently, a novel global phase diagram by kivelson, lee and zhang 4 predicted a series of direct anderson insulator a special type called a hall insulator 5 which has a nondivergent hall resistance to quantum hall conductor transitions as a consequence of delocalization induced by a. Finding novel topological quantum matter and topological phase transitions has been a central theme in modern physics. Section iv is devoted to threedimensional 3d topological insulators. The vertical red line shows when the laser electric field yellow oscillating curve crosses the threshold field, destroying the insulating phase of the material. Cuprate superconductors competing orders and recent experiments. Superconductivity physics of conductors and insulators. Request pdf conductorinsulator quantum phase transitions, edited by vladimir dobrosavljevic, nandini trivedi, and james m. Minimal models for a superconductor insulator conformal quantum phase transition. The mott transition a metal insulator transition caused by repulsive coulomb interactions between electronsis a central issue in condensed matter physics because it is the mother earth of various attractive phenomena. Good references beside sachdevs book are also welcome. Backgating via the solid ion conductor sic engenders a sit in bscco due to the modulation of carrier density by.
Contrary to classical phase transitions, quantum phase transitions can only be accessed by varying a physical parametersuch as magnetic field or pressureat absolute zero temperature. Conductorinsulator quantum phase transitions, edited by vladimir. The ultrafast electron diffraction experiments observe collective atomic motions at the photoinduced phase transition with a temporal resolution of 1 ps. Termsvector search result for insulator transition 1. The top panel shows the average number of doublonhole pairs per site blue and the decay of the insulating fieldfree ground state red. Ultrafast pathways of the photoinduced insulatormetal. These are phase transitions occurring at absolute zero temperature, as function of a non. This process is experimental and the keywords may be updated as the learning algorithm improves. Theoretical model could aid search for ideal material for quantum computers may 10, 20 from insulator to conductor in a flash. But even otherwise i claimed it was an interesting model calculation. Buy conductor insulator quantum phase transitions on.
This means that the system with an even number of kramers pairs of edge states is equivalent to a system with no gapless edge state. Magneticfielddriven superconductorinsulator transition in. Quantum phase transition from a superfluid to a mott. Edited by vladimir dobrosavljevic, nandini trivedi, and james m. Conductorinsulator quantum phase transitions oxford. The metalto insulator transition is very important for switches and for logic devices with a. The low upper critical field in this system allows us to perform magnetic field binduced sit in the liquidgated superconducting film. Access free conductor insulator quantum phase transitions complex countries, allowing you to get the most less latency era to download any of our books taking into consideration this one. In the first case, the substance is called an insulator, and in the second case a. When many particles come together how do they organise themselves. Conductorinsulator quantum phase transitions book, 2012.
Switch from insulator to conductor leaves atoms behind. The topological insulator ti is a new phase of matter that exhibits quantum halllike properties, even in the absence of an external magnetic field. The superconductormetal quantum phase transition in ultranarrow. Topologydriven magnetic quantum phase transition in. We observe a magneticfieldinduced transition which occurs at high magnetic fields from an integer quantum hall phase to a hall insulator phase and finally reenters to a integer quantum hall phase. The magnetic impuritytuned transition is characterized by progressive suppression of the critical temperature to zero and a continuous transition to a weakly. Vladimir dobrosavljevic, nandini trivedi, and james m. Topological phase transition in quasione dimensional. Finitesize scaling analysis indicates that sits induced both by electric and magnetic field are quantum phase transitions and the. Slow dynamics of electrons at a metalmott insulator. A prominent example of such a quantum phase transition is the change from the superfluid phase to the mott insulator phase in a system consisting of bosonic particles with repulsive interactions.
Such phase transitions should allow us to develop entirely new switching elements for nextgeneration electronics that are faster and potentially more. Explores topics at the forefront of research on quantum phase transitions. Could someone provide me with a better explanation on how the metal insulator transitions might be a quantum phase transitions, e. In most materials, the metal insulator transition mit is a continuous quantum phase transition 1, 2driven by a physicaltuningparameter,pe. Phase transition between the quantum spin hall and insulator phases in 3d 4 states is even or odd. We tuned the degree of phase coherence by varying the etching time of our films. The chapters in this book give insights into how a coherent metallic or superconducting state can be driven into an incoherent insulating state by.
We explore topological phase transition, which involves the energy spectra of fieldinduced spindensitywave fisdw states in quasione dimensional q1d organic conductors, using an extended suschriefferheeger ssh model. Mott insulators with spin s12 per unit cell berry phases, bond order, and the breakdown of the lgw paradigm c. The superconductor insulator transition is an example of a quantum phase transition, whereupon tuning some parameter in the hamiltonian, a dramatic change. An outstanding example is the chern insulator, first conceived as a. Quantum phase transition insulator transition mott transition mott insulator band insulator these keywords were added by machine and not by the authors. Straininduced topological insulator phase transition in hgse lars winterfeld, 1,2 luis a. Furthermore, spin liquid states, which are quantum. On the lowfield insulatorquantum hall conductor transition. The quantum phase transition between a superfluid and an. Topological quantum phase transitions of chern insulators. The magneticfield tuned superconductorto insulator transition hsit is a paradigmatic quantum phase transition and, along with the quantum hall liquidto insulator transitions qhit, is among the best experimentally studied ones.
Conductor insulator quantum phase transitions 1st edition, kindle edition. The quantum phase transition between a superfluid and an insulator. We studied how quantum phase coherence evolves across superconductormetal insulator transitions through magnetoconductance quantum oscillations in nanopatterned hightemperature superconducting films. We study strong correlation effects in topological insulators via the lanczos algorithm, which we utilize to calculate the exact manyparticle groundstate wave function and its topological properties. Understanding and characterizing unique properties of these materials can lead to many novel applications, such as current induced magnetization or extremely robust quantum memory bits.
Magnetic quantum phase transitions in dimerized mott insulators landauginzburgwilson lgw theory b. We investigate topological quantum phase transitions tqpts of chern insulators in twodimensional honeycomblattice disk with sixfold rotational symmetry. Quantum phase transitions describe the violent rearrangement of electrons or atoms as they evolve from well defined excitations in one phase to a completely different set of excitations in another. Straininduced topological insulator phase transition in hgse. Topological insulator an overview sciencedirect topics. The superconductor insulator quantum phase transitions tuned by three independent parameters.
In physics, a quantum phase transition qpt is a phase transition between different quantum phases phases of matter at zero temperature. Phase transition between the quantum spin hall and. The first lattice version of topological states without an external magnetic field or without time reversal symmetry is the wellknown haldane model 1 which has two nontrivial. Conductorinsulator quantum phase transitions ebook, 2012. I had obtained the phase diagram of the dirty boson problem using path integral methods and if the sit in disordered films was in the same universality class then our calculations would be relevant for that. The phase transition is known to be caused by fisdw, a longrange spin ordering effect due to the application of the externally applied magnetic field 19,20,21,22,23. Conductorinsulator quantum phase transitions oxford scholarship. This title is not supported on kindle ereaders or kindle for windows 8 app. It is the possible existence of a new conducting state and hence a new quantum phase transition in 2d that is the primary focus of this session. However, in the transition and the proximate groundstate phases, it has consistently exhibited features that are seemingly at odds with the generally accepted. Bscco flakes and address simultaneously their transport properties as well as the evolution of density of states.
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