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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Mott insulators"”.
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Metal-insulator transitions in Mott insulators.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Physics.
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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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Electronic properties of doped Mott insulators and high temperature superconductors
… noted by Anderson, these materials are doped Mott insulators and the novel phenomenology emerges in the regime intermediate to the Neel state and the Fermi liquid metal where electrons evolve from being local moments to itinerant entities. This thesis attempts to describe the evolution of the …
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Scattering and thermodynamic studies of effects of hole- and electron-doping in selected antiferromagnetic Mott Insulators
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Experimental consequences of mottness in high-temperature copper-oxide superconductors
… puzzle in itself. As these materials are doped Mott insulators, the interaction between electrons is particularly strong. The strong electron correlations are responsible for the breakdown of Fermi-liquid behavior in the normal state. A variety of experimental probes reveal anomalous features in …
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The problem of spin and charge separation in condensed matter
… in condensed matter. We focus primarily on Mott insulators at half-filling. It is known that one dimensional strongly correlated electronic systems display the phenomenon of spin and charge separation. We show that there exists a qualitatively different mechanism for the separation of spin …
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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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Exact diagonalization study of strongly correlated topological quantum states
… particles. In addition, we studied topological Mott insulators with spontaneous time-reversal symmetry breaking induced by interaction. We also studied emergent kinetics in one-dimensional lattices with spin-orbital coupling. The exact diagonalization method and its implementation for studying …
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Exotic phases and quantum criticality in gapless correlated electron systems
… that is likely to be realized in certain organic Mott insulators. Here we show how such a phase can be accessed from a low energy description of a metal, without resorting to slave-particle constructions. Methodologically, the work in this thesis relies on field theoretical methods such as the …
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Collective excitations in layered materials with momentum-resolved electron energy loss spectroscopy
… superconductors, charge density waves, and Mott insulators among many others. These interactions are quantified by the charge density response function, chi(q,w) (or the closely related inverse dielectric function). The measurement of the energy- and momentum-resolved chi(q,w) over a large …
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Condensation and pairing in inhomogeneous cold atomic and electronic systems
… BEC phase to a coexistence of local BEC and Mott-insulating phases. We discuss the ground state properties, excitations, and experimental signatures of the condensate surrounded by the Mott-insulators. BCS pairing in fermionic atoms of two spin species that are confined to spatially separated …
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Nonreciprocal phenomena in superconductivity
… The second part of this thesis concerns doped Mott insulators in a magnetic field, described by a triangular-lattice Fermi-Hubbard model in the limit of strong interaction. This is relevant for many novel materials, such as moiré transition metal dichalcogenides bilayers. We predict a new bound …
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Coupled one dimensional electron systems and stripe phases of high temperature superconductors
… charge density wave (CDW) states and Mott insulators in the presence of a hard-wall boundary. I calculate the boundary contribution to the single-particle Green function in the low-energy limit using field theory techniques and analyze it in terms of its Fourier transform in both time …
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Renormalization for insulating states of matter
… is the spectral weight structure of hole-doped Mott insulators. As the mixing between two separate Hubbard bands is dynamically generated, additional charge degrees of freedom is required to give a proper description to the relevant low-energy physics. On this account, we first discuss how the …
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Wonderland of frustration: Magnetic moments and itinerant electrons on the pyrochlore lattice
… at half-filling, where the magnetic moments in a Mott insulator are localised and interact through Heisenberg exchange. Classically, the nearest-neighbour pyrochlore Heisenberg antiferromagnet is a well-established spin liquid down to zero temperature. We investigate the stability of this spin …
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Exploring the strongly correlated realm of electrons using scanning tunneling spectroscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms