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 19 of 19 for “"Topological superconductors"”.
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Majorana qubits in non-Abelian topological superconductors
Non-Abelian superconductors are novel systems with exotic quasiparticle excitations, namely Majorana fermions, which obey non-Abelian quantum statistics. They are exploited as hardware platforms for fault-tolerant topological quantum computing. In this thesis, we primarily study the non-topological …
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Rotational Symmetry and Phase Dynamics in Topological Superconductors
Topological superconductors are phases of matter that cannot be adiabatically connected to a trivial superconductor without closing the bulk gap or breaking some fundamental symmetry. Intimately tied to topological superconductors are Majorana bound states. These are neutral zero-energy …
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Investigation of Iron-Based and Topological Superconductors via Point-Contact Spectroscopy
… (PCS) measurements preformed on a variety of superconductors which are predicted to exhibit unconventional Cooper pairing mechanisms. Point-contact spectra of the iron pnictide BaFe_{1-x}$Pt$_x$As$_2$ are consistent with a two-gap isotropic s-wave model. This conclusion is supported by …
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MAJORANA FERMION IN TOPOLOGICAL SUPERCONDUCTOR AND MOTT‐SUPERFLUID TRANSITION IN CIRCUIT‐QED SYSTEM
… the Majorana fermion and its transport in the topological superconductors. In Chapter 2, we investigate the edge states and the vortex core states in the spin-singlet superconductor with Rashba and Dresselhaus (110) spin-orbit couplings. In Chapter 3, we use Keldysh non-equilibrium Green …
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Understanding, constructing, and probing highly-entangled phases of quantum matter
… ground-states. The first Part describes topological superconductors with non-Abelian defects, and develops realistic routes to constructing these exotic superconductors from more elementary materials. Particular attention is payed to practical issues such as disorder. The second Part …
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Majorana-based Topological Quantum Algorithms in Magnet-Superconductor Hybrid Structures
Majorana zero modes harbored by topological superconductors may be the key ingredient for the realization of fault-tolerant quantum computing and topologically protected quantum devices. Magnet-superconductor hybrid (MSH) systems have proven to be an experimentally versatile platform for quantum …
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Three-particle mechanism for unconventional superconductivity with potential applications in moiré materials
… of the most important class of unconventional superconductors – dilute superconductors with large [formula] ratios and spin-triplet superconductors – the so-coined “three-particle” mechanism for superconductivity studied throughout this thesis appears pivotal to future research on high-𝑇꜀ and …
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Quantum Transport in Topological Phases of Matter
Topological phases of matter attract constant attention in the condensed matter physics community, both due to the fundamental yet simple principles that govern them, and a multitude of experimental observations with the potential for technological applications. Among the ways of studying such …
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Aspects of critical spin 1 chains and 2 dimensional symmetry protected topological phases of matter
… quantum spin-1 chains and symmetry protected topological phases of matter in two spatial dimensions. In the first context we consider the SU(3) symmetric spin-1 chain with additional interactions. We use bosonization to demonstrate that the effective field theories describing the critical …
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Inverse methods in quantum many-body physics
… analogues. Examples include phases with topological properties, which can occur at low temperatures in frustrated magnets and certain superconductors, and many-body localized (MBL) phases that do not obey the laws of thermodynamics, which can occur in interacting disordered magnets. …
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Topological phases, non-equilibrium dynamics and parallels of black hole phenomena in condensed matter
… in the quantum Hall effect. Majorana modes in topological superconductors are of fundamental importance as realizations of real solutions to the Dirac equation and for their anyonic exchange statistics. They are realised as zero energy edge modes in one-dimensional topological superconductors, …
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Open quantum system theory from an information perspective
… Examined systems range from solid state p-wave topological superconductors coupled to a structured phonon environment, where a memory-induced stabilization and recovery of topological properties is observed, to semiconductor quantum dot nanostructures exhibiting complete population inversion and …
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Self-Consistent Study of Topological Superconductivity in Two-Dimensional Quasicrystals
… and experimental activities in the field of topological superconductors. Topological superconductivity (TSC) results in a novel superconducting state characterized by a nonzero topological invariant in the bulk. There is a relation between the bulk and edges or surfaces, which is called the …
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Applications of conformal field theories in topological phases of matter
… of conformal field theories (CFTs) in topological phases of matter. The first part is devoted to a discussion of coupled wire constructions of some novel quantum Hall systems. Through a theoretical coupled wire model, we construct strongly correlated electronic integer quantum Hall …
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Angle-resolved photoemission and first-principles studies of topological semimetals and heterostructures
Topologically nontrivial systems are electronic materials that have protected conducting states on their edge or surface. These widely studied materials are of great interest due to their exotic physical properties and potential for applications in spin-related electronic devices and quantum …
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The classification of topological insulators and superconductors for non-spatial and spatial symmetries
We study a topological classification of insulators and superconductors in the presence of non-spatial discrete symmetries in the Altland-Zirnbauer classification and spatial symmetries in any spatial dimension. We provide a unified method, the construction of bulk Dirac Hamiltonians in minimal …
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Pair density wave superconducting states and statistical mechanics of dimers
… to electronic liquid crystal (ELC) phases, its topological aspects in a one dimensional model and its appearance in a quasi-one dimensional system. On the other hand, chapter 5 is focused on the investigation of the classical statistical mechanics properties of dimers, in particular, the dimer …
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Electric multipole moments and higher-order topological phases in crystalline insulators and superconductors
… charge is at the basis of our understanding of topological band theory. We show, by using the Berry phase formulation and generalizations of it, as well as by exact diagonalization of tight-binding models, that crystalline insulators can generate charge and polarization patterns compatible with …