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 10 of 10 for “"nematic order"”.
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Orbital order in iron-based superconductors
In this thesis, we propose that a ferro-orbital order, which breaks the degeneracy between the Fe $d_{xz}$ and $d_{yz}$ orbitals, is the effective cause of the structural and the magnetic transitions in the iron-based superconductors. We will discuss this orbital order in the framework of the …
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Exotic phases and quantum criticality in gapless correlated electron systems
… for a Pomeranchuk transition where an electronic nematic order parameter develops we present a controlled expansion within which the physics of such a transition, and of the related problem of fermions coupled to a gauge field, can be addressed. Thirdly, in a quantum spin liquid phase that is …
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Frustrated Magnetism in Strongly Correlated Electron Systems
… correlated electron systems, where exotic orderings can be induced as a result of magnetic frustration and quantum fluctuations. We show that emergent spin textures can arise close to a magnetic field-induced quantum critical point, when the single magnon excitations have several degenerate …
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Modeling Pattern Formation in Biopolymer Systems induced by Reaction Kinetics and Molecular Motors
… the latter. The cell displays filament-related ordered structures like aster patterns in the mitotic spindle, bundles in actin stress fibers and also oscillating structures e.g. in muscle bundles. The question is to what extent these structures inside the cell are governed by the physics of …
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The effect of shear flow on the Isotropic-Nematic transition in liquid crystals
… the effects of shear flow on the Isotropic-Nematic phase transition in liquid crystals. Shear flow has dramatic orienting effects on the rod-like constituents of nematic liquid crystals, with the general effects of (1) inducing order in the high-temperature isotropic phase, and (2) dictating …
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Understanding the Mechanisms of Shock-Induced Deformation in Polymeric Systems
… to generalize the benefits of one material in order to find alternatives. This thesis focuses on the study of polymeric materials, which often outperform traditional materials in terms of shock energy absorption. The vast design space of polymers affords them a diverse set of physical …
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Optical and core-level X-ray spectroscopy of correlated two-dimensional materials
… Waals (vdW) materials offers a rich landscape of ordered phases and associated excitations for potential applications in nanoelectronics. The coupling between distinct degrees of freedom in correlated materials provide routes to realize novel functional properties, which can be further manipulated …
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Examination of Mechanical Stretching to Increase Alignment in Carbon Nanotube Composites
… specific modulus of CNT-polymer composites. In order to obtain the maximum benefits of a fiber in any matrix in terms of stiffness and strength, it is preferable to align the high strength and stiffness fibers in the direction of loading. Given that these CNT sheets essentially consist of …
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Pair density wave superconducting states and statistical mechanics of dimers
… fermions in two dimensions in an electronic nematic spin-triplet phase where rotational symmetry is broken in both real and spin space PDW phases arise naturally in a theory that can be analysed using controlled approximations. We show that several superfluid phases that may arise in this …
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Development of applications of liquid crystalline elastomers from Materials to Applications
… called mesogens, exhibiting orientational ordering. These mesogens can self-assemble into many types of ordering and transition to being isotropic reversibly subjected to external stimuli. In the last four decades, this field has seen many advancements: the first generation of polysiloxane …