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Showing 1 to 20 of 54 for “"Mott-Insulator"”.
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Compressibility of a bosonic Mott-insulator in a disordered optical lattice
… in order to access the low-temperature Mott-insulator--Bose-glass transition."
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Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition
… superfluid phase) and strong interaction(the Mott insulating phase). The stability of superfluid currents was studied using a moving optical lattice. The critical momentum for stable superfluid current varies from 0.5 recoil momentum (shallow lattice) to 0 (the Mott insulator) as the system …
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CONFINED ULTRACOLD BOSONS IN ONE DIMENSIONAL OPTICAL LATTICES
… pertaining to the experimental realization of Mott insulator states with one or more atoms per sites in inhomogeneous lattices is elucidated by introducing an intuitive model for strongly interacting bosons in one dimension. This model is then utilized to study the decay of the dipole …
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Quantum Simulation of Spin-1 Physics with Bosons in Optical Lattice
Mott insulators of ultracold atoms in optical lattices are widely used as an experimental platform for simulating and studying many-body physics. A topic at the frontier of quantum simulation with Mott insulators is the study of quantum spin models, which are intimately connected to other modern …
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Effective action approach to quantum phase transitions in bosonic lattices
… describing the quantum phase transition between Mott insulating and superfluid states observed in bosonic optical lattices. I begin by adding to the Hamiltonian of interest a symmetry breaking source term. Using time-dependent perturbation theory, I then expand the grand-canonical free energy as …
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Fermion pairing and correlations under a quantum gas microscope
… techniques to directly reveal the formation of a Mott insulator of fermions with strong repulsion and the crossover to a gas of local pairs with strong attraction. At intermediate attraction, we observe correlated fermion pairs extending over multiple lattice sites, and these pairs interact to …
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Transport properties in the vicinity of Mott insulators
Understanding the states in the vicinity of the Mott insulator is crucial to understanding both the physics of the transition between a Mott insulating phase and a metallic phase and the physics of the cuprate high-temperature superconductors. In this thesis, we start from the standard Mott …
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Thermometry and cooling of ultracold atoms in an optical lattice
… first practical method for thermometry in the Mott insulator, and has features of high dynamic range and tunable sensitivity. Given sufficient optical resolution and control over the magnetic field gradient, the lower limit of this thermometer is set by quantum magnetic ordering effects. The …
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Optical spectroscopy study of correlated electron physics in ABC-stacked trilayer graphene
… graphene and ABC-stack trilayer graphene. Mott insulator and superconductivity are found in these systems, which provide a cleaner and more controllable platform to study the strongly correlated physics than the traditional cuprate system. As a complementary method to trans- port …
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MAJORANA FERMION IN TOPOLOGICAL SUPERCONDUCTOR AND MOTT‐SUPERFLUID TRANSITION IN CIRCUIT‐QED SYSTEM
… quantum architecture for engineering a photonic Mott insulator-superfluid phase transition. The phase diagrams in the case of real-value and complex-value photonic hopping are obtained. Also, the quantum jump technique is employed to describe the phase diagram when the dissipative effects are …
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Ultracold quantum gases in three-dimensional optical lattice potentials
… quantum phase transition from a superfluid to a Mott insulator, and to observe the collapse and revival of a macroscopic matter wave field. Quantum phase transitions are driven by quantum fluctuations and occur, even at zero temperature, as the relative strength of two competing energy terms in …
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EXOTIC PHASES IN A SPIN-1 BOSONIC FLUX SYSTEM
… in the strong-interacting regime, we observe a Mott insulator phase characterised by a charge gap and a periodic exponential decay of the Green’s functions. However, surprisingly, the connected density-density correlation functions decay with a power law and neutral excitations are gapless. When …
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Studies of Topology and Order in Frustrated Spin Systems
… observables, and (d) we study the nature of the Mott insulator to metal transition at finite temperatures and we show that it generally belongs to the Ising universality class.
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Coherent micromanipulation of 1-D BEC in designed potentials
… a quantum phase transition between a BEC and a Mott insulator. A further possibility for expanding the capabilities of the atomchip is integrating light fields close to its surface. We generate an optical lattice on our chip and use it to realize an atomic beamsplitter. Coherent splitting of a …
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Field Theory of Mottness
… nonvanishing of the restricted f-sum rule in the Mott insulator, (2) the T2 contribution to the thermal conductivity, (3) pseudogap, (4) bifurcation of the electron spectrum below the chemical potential, as recently seen in angle-resolved photoemission, (5) insulating behavior away from …
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Superconductivity in Multi-Band and Disordered Systems
… that a clean array 4He atoms is a self-generated Mott insulator, that is, the 4He atoms constitute the lattice as well as the charge carriers. With this assumption, we are able to interpret the textbook defect-driven supersolids as excitations of either the lower or upper Hubbard bands. In the …
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Aspects of Quantum Fluctuations under Time-dependent External Influences
… the structure formation during the superfluid to Mott-insulator transition in the Bose-Hubbard model; and secondly, the formation of spin domains as a two-dimensional spin-one Bose gas is quenched from the (polar) paramagnetic to the (planar) ferromagnetic phase. During this quench, the symmetry …
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Light Scattering in Ultracold High Density Rubidium Vapor
… atomic systems. Bose Einstein Condensation, the Mott insulator transition, and superfluidity are examples of such achievements. Another considerable interest to both condensed matter and atomic physics is Anderson localization of light. The localization phenomenon is named after P. W. Anderson …
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Quasi-one-dimensional magnetism in TiOCl and a theory of a lightly doped dimerized insulator
… is studied as an example of an S = 1/2 layered Mott insulator. Earlier experiments on this material indicating two-dimensional spin-liquid behavior are reviewed critically and are compared to new susceptibility data. The latter suggest a new picture, where band structure effects produce …
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Non-equilibrium dynamics of ultracold atoms in optical lattices
… first experiment, we study quenches across the Mott-insulator-to-superfluid quantum phase transition in the 3D Bose-Hubbard Model. The quench is accomplished by continuously tuning the ratio of the Hubbard energies. We observe that the degree of excitation is proportional to the fraction of …
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