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 47 for “"time reversal symmetry"”.
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Suppression of disorder-induced scattering in optomechanical systems
… from disorder can be suppressed by breaking time-reversal symmetry in magneto-optic (Sov Phys JETP, 59, 1, 1984; Phys Rev B, 37, 1988) and topological insulator materials (Phys Rev B, 38, 1988; Nature, 461, 7265, 2009). Yet, common monolithic dielectrics, which are basic building ingredients …
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Explorations of domain walls and half quantum vortices in unconventional superconductors
… which may exibit spontaneously broken time reversal symmetry. Triplet superconductors have been proposed to host half quantum vortices, whereas superconductors with spontaneously broken time-reversal symmetry are proposed to admit domain walls that separate regions of opposing …
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Two classes of unconventional photonic crystals
… of two dimensional photonic crystals that break time-reversal symmetry due to a magneto-optic effect. The band theory for such systems involves topological quantities known as "Chern numbers", which give rise to the phenomenon of disorder-immune one-way edge modes. I describe a system in which …
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Mesoscopic quantum interference experiments in InGaAs and GaAs two-dimensional systems
… of h/2e. The AAS oscillations require time-reversal symmetry and hence can be used to qualify time-reversal symmetry breaking. More importantly, the fundamental mesoscopic dephasing length associated with time-reversal symmetry breaking under applied magnetic field, an effective …
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Josephson Interferometry Measurements in High-T(c) Grain Boundary Junctions
… junctions depend strongly on the pairing symmetry and the electronic structure at the interface and can be used to determine the pairing symmetry as well as the structure of the grain boundary interface. Andreev reflection at the (110) surface in d-wave superconductors leads to the …
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Josephson Interferometry Measurements in High-Tc Grain Boundary Junctions
… junctions depend strongly on the pairing symmetry and the electronic structure at the interface and can be used to determine the pairing symmetry as well as the structure of the grain boundary interface. Andreev reflection at the (110) surface in d-wave superconductors leads to the …
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Non-equilibrium phase separation in active matter
… from a shared free energy. This mismatch breaks time- reversal symmetry (TRS) and leads to new types of dynamical competition that are absent in or near equilibrium. We construct a canonical scalar field theory to describe such systems, with conserved and non-conserved dynamics obeying Model B …
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Nonreciprocal and Exotic Radiative Transfer in Type-I Magnetic Weyl Semimetals
… by asymmetric dielectric tensors and broken time reversal symmetry. This is typically achieved using an external magnetic field, but a recently discovered family of quantum materials—Weyl semimetals—can possess intrinsic nonreciprocity due to the Berry curvature, an internal, pseudo-magnetic …
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Some Topological Aspects of Condensed Matter Physics
… a classification of band insulators with time reversal symmetry in two and three dimensions is presented. The possibility of a three dimensional quantum spin Hall effect is pointed out. A topological classification of lattice superconductors is also derived.
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Exact diagonalization study of strongly correlated topological quantum states
… 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 these systems can easily be …
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On the irreversibility of collective motion in polar active matter
… thermodynamics, (stochastic) entropy production, time-reversal symmetry, the principle of detailed balance, Sekimoto’s stochastic energetics and spherical diffusions, with example applications. • Chapter 3 – Review of the Vicsek model (VM), the ‘continuous-time Vicsek model’ (CTVM) and mean-field …
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Photonic design for chemical analysis
… linear electromagnetic systems possessing time-reversal symmetry, we present an approach to bound ratios of internal fields excited from different ports, using only the scattering matrix, improving upon previous related bounds by Sounas and Alù (2017). By reciprocity, emitted-wave …
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Investigation of magnetic interactions in topological insulators
… and valence bands, which is protected by time reversal symmetry. As a result, the bulk keeps insulating while the surface supports an exotic high-mobility spin-polarized electronic states. Introducing magnetism into topological insulators will break the surface time reversal symmetry and …
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On the topological properties of the vibrations of solids
… of phonon bands and the intrinsic crystalline symmetry, the topological invariant carried by the band crossing can either be an integer number for a two-band subspace or an non-Abelian frame charge when at least three bands are involved. The phonon band crossing formed in a two-band subspace is …
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Brillouin scattering induced transparency and generation of slow and fast light
… considered. The non-reciprocity, or a break in time reversal symmetry, is a unique property of Brillouin scattering process due to the traveling surface acoustic wave which is used for phase matching the optical modes. Therefore, BSIT can be used for applications such as optical isolation while …
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Quantum electronic transport in atomically layered topological insulators
The merger of topology and symmetry established a new foundation for understanding the physics of condensed matter, beginning with the notion of topological insulators (TIs) for electronic systems. For the time-reversal invariant TIs, a key aspect is the "helical" mode at the boundary of the system …
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Geometric and Topological Aspects of Soft & Active Matter
… nematic orientational order, I show how broken time-reversal symmetry due to the active drive allows polar flocks on a curved surface to support topologically protected sound modes. In an active nematic, activity instead causes topological disclinations to become spontaneously motile, driving …
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Electromagnetic response of time-reversal breaking metallic phases in two dimensions
… in two-dimensional electron fluids in which the time-reversal symmetry is broken spontaneously by using the method of higher dimensional bosonization. Mean-field calculations show that the order parameter is two two-component real vectors [Sun and Fradkin 2008]. There are two phases: the beta …
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Novel electromagnetic scattering phenomena
… gauge fields in real space, enabled time-reversal symmetry breaking with distinct manners. These synthetic non-Abelian gauge fields enables us to observe the non-Abelian Aharonov-Bohm effect with classical waves and classical fluxes, relevant for classical and quantum topological …
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