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 34 for “"Quantum phases"”.
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Subdimensional particles and higher rank quantum phases of matter
Many quantum phases of matter, such as quantum spin liquids and fractional quantum hall systems, are well-described in the language of gauge theory. Until recently, most theoretical attention has been focused on systems described by familiar vector gauge theories. In this thesis, we will explore …
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Applied fractionalization : quantum phases and phase transitions of strongly interacting systems
… that strong interactions may lead to new phases and phase transitions of matter that don't fit paradigms such as Fermi liquid theory or Landau's theory of phase transitions. On the other hand, there are actual materials which are undoubtedly governed by strong interactions and indeed do …
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Intertwined symmetry and topology in 3 + 1 dimensional gapped quantum phases of matter
… properties of 3 + 1 dimensional Bosonic gapped phases of matter. We divide our study into two main themes, the first involving short-range entangled phases with global symmetries also known as symmetry protected topological phases and the second involving phases with long range entanglement also …
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Studying many-body physics through quantum coding theory
… This thesis illustrates the use of classical and quantum coding theory in classifying quantum phases arising in many-body spin systems via a systematic study of stabilizer Hamiltonians with translation symmetries. In the first part, we ask what kinds of quantum phases may arise in gapped spin …
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The Death of Quasiparticles: Strongly Interacting Gapless Phases with Fermi Surfaces and Fractional Statistics
… a powerful organizing principle for many quantum phases of matter, ranging from conventional magnets and superconductors to exotic insulators with topological order. In this thesis, I describe my research in gapless quantum phases in which the framework of quasiparticles breaks down. The …
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Ultracold molecules from ultracold atoms : interactions in sodium and lithium gas
… decay and loss, many-body dynamics, novel quantum phases, and molecule formation. Experimental data is presented alongside relevant theory and numerical models. Results are presented for both homonuclear Na 2 and Li 2 molecules, as well as heteronuclear NaLi resonances, although we were …
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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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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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Strongly correlated ultra-cold bosonic atoms in optical lattices
… matter physics is to study the origin of exotic quantum phases such as coexistent and inhomogeneous phases, quantum criticality, and secondary ordered phases close to quantum critical points. Exotic phenomena in strongly correlated systems occur due to competing complex interactions of spin, …
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EMERGENT PHENOMENA AND NOVEL DEVICES BASED ON SPIN-ORBIT COUPLING AT COMPLEX OXIDE INTERFACES
… and energy-efficient devices utilizing novel quantum materials and properties. Spin-orbit coupling (SOC) has been pivotal to this effort as it offers an effective means to drive and manipulate magnetic properties – such as anisotropy, spin relaxation, magnetic damping, anisotropic …
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The Kitaev Model on Surfaces with Lattice Defects and of Higher Genus
The quantum phase of a physical system is defined as its ground state. As examples of quantum phases we mention super uids, superconductors, Bose- Einstein condensates and quantum Hall states. Different phases of a system originate from the different ways a systems' constituents can be organised …
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Electromagnetically induced transparency by NMR
… Induced Transparency (EIT) is a quantum nonlinear optical interference effect in which light at a certain frequency makes normally opaque atomic systems transparent to light at another frequency. Recent experiments in Atomic Molecular and Optical (AMO) physics demonstrated how the …
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Quantum chaos and phase transitions
Quantum materials permeate the modern world - these are systems that exhibit quantum mechanical properties, like topological phases and superconductivity, at macroscopic scales. The principles governing quantum materials include entanglement and coherence -phenomena which are fundamentally quantum …
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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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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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Strongly correlated quantum fluids and effective thermalization in non-Markovian driven-dissipative photonic systems
Collective quantum phenomena are fascinating, as they repeatedly challenge our comprehension of nature and its underlying mechanisms. The qualification ``quantum'' can be attributed to a generic many-body system whenever the interference effects related to the underlying wave nature of its …
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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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Hofstadter Physics and Composite Fermionic Phase in Moiré Systems
… provide fertile ground for investigating novel quantum states. A key focus is on understanding Hofstadter physics and the emergence of composite fermion phases in these materials. In this work, we first develop a continuum model to describe the low-energy electronic structure of twisted TMD …
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Experimental Observation of Geometric Phases in Narrow-Gap Semiconductor Heterostructures
We have studied the electron quantum phase by fabricating low dimensional (d ≤ 2) mesoscopic interferometers in high-quality narrow-gap semiconductor (NGS) heterostructures. The low effective-mass electrons in NGS heterostructures enable observation of delicate quantum phases; and the strong …
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A single-site resolution fermionic quantum-gas microscope
Quantum-gas microscopes have become an important tool in quantum simulation as they enable direct probing of local quantities by single-atom-resolved detection in optical lattices. Recent years have seen many fascinating results from the bosonic quantum-gas microscopes using 87Rb. However, no such …
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