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 54 for “"momentum-space"”.
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Momentum-space lattices for ultracold atoms
… of a Bose–Einstein condensate, which we call a momentum-space lattice, to emulate one-dimensional lattice models. The idea of a synthetic dimension or synthetic lattices is a useful construct to describe how the particle dynamics can evolve in degrees of freedom that are not directly related to …
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The cold atom toolbox in momentum space
… lattice models. In this thesis, we present our ""momentum-space lattice"" technique in which we use individual laser frequencies to couple the momentum states of a rubidium-87 Bose-Einstein condensate, in order to create lattices with site-by-site and link-by-link precision. This technique is …
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Tunable cold-atom momentum space double wells for phase-sensitive measurements
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Fock's representation for molecular orbitals
V. Fock studied the hydrogen atom problem in momentum space by projecting the space onto a 4-dimensional hyper-sphere. He found that as a consequence of the symmetry of the problem in this space the eigen-functions are the R<sub>4</sub> spherical harmonics and that the eigenvalues are determined …
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Experimental determination of the symmetry of the superconducting pairing state in yttrium barium copper oxide
… in the cuprates. By probing the momentum space anisotropy of the phase of the superconducting order parameter, we can experimentally determine the symmetry of the superconducting pairing state in YBCO and distinguish between the leading candidate states that have been proposed. We …
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Direct Observation of Nodal Quasiparticles in the Non-Magnetic Superconductors Yttrium(lutetium)nickel-Boron-Carbon Field-Angle Dependent Heat Capacity
… superconductors may vanish at points or lines in momentum space, permitting electronic excitations, termed nodal quasiparticles, to exist at temperatures well below the superconducting transition. In the vortex phase, the presence of nodal quasiparticles should be directly observable through the …
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MOMENTUM SIGNATURES OF THE ANDERSON TRANSITION
… the Anderson metal-insulator transition (MIT) in momentum space. We find that an initial plane-wave propagating in a disordered medium exhibits a diffusive background and two interference peaks, the coherent backscattering (CBS) and the coherent forward scattering (CFS) peaks in the momentum …
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On a Renormalized QCD-inspired Model in the Light-cone Formulation
… The renormalized model is then solved in momentum space by calculating its mass spectrum. These are then compared with the experimental measured values. A large part of this thesis is dedicated to the calculation of resonances in the stationary picture, as well as Coulomb scattering in the …
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QCD Boltzmann equation: beyond the soft-scattering approximation
… many-gluon system, distributed isotropically in momentum space, to study the evolution of a hot (quark-) gluon plasma from an initial state towards equilibrium. To that end, we investigate the QCD Boltzmann equation making use of a calculation scheme that reproduces the known result for scalar …
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Phases and non-equilibrium dynamics of ultracold bosons in an optical quasicrystal
… properties such as a dense and self-similar momentum space, and a localization transition to Anderson insulator or Bose glass states (in non-interacting or interacting cases respectively) reminiscent of that in disordered systems, whilst lacking the rare regions that typically exist in such …
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TMD Approach in High Energy Physics:Theory and Applications
… the three–dimensional description of hadrons in momentum space within the Transverse Momentum Dependent (TMD) framework along two complementary directions: the study of azimuthal distributions of hadron pairs produced in photon–photon collisions, where we formulated the kinematics and helicity …
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Half-bound states of a one-dimensional Dirac system: their effect on the Titchmarsh-Weyl M([lambda])-function and the scattering matrix
… we establish community of the S-matrix in momentum space and prove the Levinson theorem as a corollary to this analysis. We also obtain explicit asymptotics of the S-matrix for power-law potentials
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Inelastic nuclear scattering of strongly absorbed particles
… shape of the reflection coefficients in angular momentum space. Analyses of representative sets of experimental data are presented. The results indicate that the Austern-Blair theory. ts remarkably successful in representing the shape of the angular distribution, but tends to underestimate the …
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Phase transition of a vector operator in AdS-CFT
… found poles of the retarded Green's functions in momentum space, which indicate possible instabilities. We found that existence of such poles depends a parameter r,, which indicates possible phase transitions when we adjust K through some critical values. Interestingly, we also found that …
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Aspects of Non-Perturbative Renormalization
… inspired by Wilson's blocking construction in momentum space: the Wegner-Houghton method uses a sharp momentum cut-off and thus cannot be applied directly to non-constant fields (contradicts with the "derivative expansion"); the Polchinski method is based on a smooth cut-off and thus …
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Strongly Correlated 2D Electronic Systems: Interplay between Band Topology and Electron-electron Interaction
… by either enlarging the low energy Hilbert space [6] or by constructing a momentum space model[7] for twisted bilayer graphene(TBLG) aligned with hexagonal boron nitride(hBN). We also discussed the effect of translation symmetry breaking in this system[7]. Motivated by these results in moiré …
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Novel Aspects of Localization, Delocalization, and Anomalous Transport in One-dimensional Systems
… leads to superballistic transport in the momentum space.
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Interaction between vortices and impurities in a d-wave superconductor /
… of quasiparticle properties both in real space and momentum space. In this thesis, we will present a theoretical analysis of the scanning tunneling microscopy (STM) data in BSCCO. We introduce the Bogoliubov-De Gennes Hamiltonian and solve it numerically on a two-dimensional 20 x 20 …
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Patterns of electro-magnetic response in topological semi-metals
… off from the location of the singular points in momentum space and the helicities/chiralities of the singularities. We motivate and derive effective response actions for the 2D and 3D Dirac semi-metals, the Weyl semimetal, the 3D line node semi-metal and the 3D mirror protected topological …
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Communal pairing in Fermi gases with attractive interactions
… where the fermion pairs have zero net momentum, leading to BCS superconductivity. Extensions for spin-imbalanced systems include breached superfluids, Fulde–Ferrell–Larkin–Ovchinnikov theory, and pair density wave theory. We propose a further extension of a superconducting state, dubbed …
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