Global ETD Search
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 20 of 29 for “"quantum matter"”.
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Aspects of Moiré Quantum Matter
The advent of moiré quantum matter has newly unified disparate themes in modern condensed matter physics, chief among them band theory, correlations, and topology. This thesis investigates how the interplay between these foundational elements leads to novel electronic phenomena uniquely enabled by …
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Collective Phenomena in Excitonic Quantum Matter
… are expected to realise a rich phase diagram of quantum phases in- and out-of-equilibrium: a hypothesized pairing instability leads to the macroscopic condensation of “excitonic insulators” in small-bandgap materials, with quantum coherence and possible super-transport persisting up to room …
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Engineering Topological Quantum Matter with Patterned Light
Topological phases are intriguing phases of matter which cannot be described with traditional characterization methods, and numerous efforts has been put to achieve these exotic phases of matter in a variety of quantum platforms. In this thesis, we discuss how topological quantum states of matter …
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Quantum Matter in the Era of Generalized Symmetries
… symmetries has led to powerful new insights into quantum matter. They have been used to classify new families of quantum phases, place constraints on phases realizable in a given physical system, and conceptually unify seemingly disparate phenomena. In many ways, they prove just as powerful as …
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Aspects of symmetry, topology and anomalies in quantum matter
To understand the new physics and richness of quantum many-body system phenomena is one of the stimuli driving the condensed matter community forward. Importantly, the new insights and solutions for condensed matter theory sometimes come from the developed and developing knowledge of high energy …
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Understanding, constructing, and probing highly-entangled phases of quantum matter
In this thesis, I explore three classes of quantum phases of matter that cannot be understood purely on the basis of symmetry, and can be regarded (to varying degrees) as having highly-entangled ground-states. The first Part describes topological superconductors with non-Abelian defects, and …
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Synthetic Topological Quantum Matter in Nanostructured 2D Materials for Quantum Information Processing
… multilayer graphene and triangular graphene quantum dots. The thesis is organized into six chapters, including an introduction and a conclusion. In Chapter 2, we present the theoretical methods used to carry out the calculations in this thesis. We begin by defining the geometry of twisted …
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Aspects of highly-entangled quantum matter : from exotic phases, to quantum computation, and dynamics
We explore three incarnations of highly-entangled quantum matter: as descriptions of exotic, gapped phases in three spatial dimensions, as resources for fault-tolerant quantum computation, and as the by-product of the unitary evolution of a quantum state, on its approach to equilibrium. In Part 1, …
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Explorations in two dimensional strongly correlated quantum matter: from exactly solvable models to conformal bootstrap
… two projects that touch upon the role of quantum mechanics in classifying phases of matter and their transitions. In the first project, we set out to answer: is it possible to find a lattice model in the Ising universality class that realizes the Kramers Wannier symmetry in such a way that …
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Investigating Topological Quantum Matter: Machine Learning Topological Phases, Topological Quantum Codes, Interplay of Disorder and Topology via Transport Phenomena and Phase Transitions
Future quantum technologies must meet three inter-locking demands: (i) faithful yet compact representations of strongly–entangled quantum matter, (ii) scalable error-mitigation protocols that tame spatially correlated noise, and (iii) near-term algorithms that coax useful optimisation and learning …
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Ultracold fermionic atoms in disordered potentials
… 3D Anderson localization for the first time for quantum matter waves. We provide the first measurement of how the mobility edge—a hallmark of 3-dimensionality—and of localization lengths depend on the disorder strength. In a second experimental study, we add an optical lattice to the disorder …
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Emergent Quantum Phenomena in Magic-Angle Twisted Graphene Superlattices
… to their ability to host a wealth of emergent quantum phenomena. Recently, moiré engineering, also known as twistronics, has emerged as a new approach for creating twodimensional correlated materials. In this thesis, I designed and studied novel moiré quantum matter based on twisted graphene …
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Entangling symmetry and topology in correlated electrons
In this thesis, I study a class of exotic quantum matter named Symmetry-Protected Topological (SPT) phases. These are short-range-entangled quantum phases hosting non-trivial states on their boundaries. In the free-fermion limit, they are famously known as Topological Insulators (TI). Huge progress …
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QUANTUM TRANSPORT WITH COLD ATOMS
… a powerful platform to study the transport of quantum matter. The interaction between atoms, the type of atoms and their confinement can be designed to simulate quantum transport phenomena that are often difficult to realize within solid state devices. Recent advances in light-shaping …
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Chiral Phases on the Lattice
While chiral quantum field theories (QFTs) describe a wide range of physical systems, from the standard model to topological quantum matter, the realization of chiral QFTs on a lattice has proved to be difficult due to the Nielsen-Ninomiya theorem and the possible presence of quantum anomalies. In …
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Quantum transport theory of 3D time-reversal invariant topological insulators
… of a recently predicted and discovered phase of quantum matter - topological insulators (TIs), which are characterized by an insulating bulk and topologically protected, gapless, spin-momentum locked surface modes. Precise engineering of these gapless modes may yield new potential materials for …
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Linear and nonlinear edge dynamics and quasiparticle excitations in fractional quantum Hall systems
… introduction to the vast subject of quantum Hall physics. We dedicate the first chapter to a discursive broad introduction. The second one is instead used to introduce the integer and fractional quantum Hall effects, with an eye to the synthetic quantum matter platforms for their …
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Fermion pairing and correlations under a quantum gas microscope
Understanding interacting quantum systems is a central goal of modern physics, with applications ranging from quantum chemistry to nuclear physics to the design of novel superconductors. This thesis describes the creation of exotic phases of quantum matter built from ultracold fermionic atoms …
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Practical electron cloaking in solids
… the cloaking effect of acoustic waves and quantum matter waves has also been discussed recently. Currently the main strategy of designing "cloaks" is the so-called transformation optics, and the resulting continuous distribution of material properties, such as the refractive index for …
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Probing Local Many-Body Dynamics with Random Quantum Circuits
Random quantum circuits are an attractive model for the behavior of complex many-body physics, due to their analytic tractability as well as ability to reproduce the behavior of chaotic quantum systems. Recent progress in elucidating their structure has led to an improved understanding of quantum …
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