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Showing 1 to 20 of 119 for “"quasiparticle"”.
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Quasiparticle and Phonon Transport in Superconducting Particle Detectors
… tunnel junctions to investigate the transport of quasiparticles and phonons in structures similar to the proposed detector designs. I have used multiple distributed junction geometries to perform injection-detection type experiments. One junction is used to inject quasiparticles and/or phonons …
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Low temperature quasiparticle transport in d-wave superconductors
… surface. Near each of these four gap nodes, quasiparticles are easily excited and behave more like massless relativistic particles than electrons in a metal. In this thesis, we study the transport properties of these nodal quasiparticles, providing theoretical interpretations for the results …
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Quasiparticle beam profile measurements in superfluid helium 3 - B
… temperatures around 100 ➭K. In this thesis, the quasiparticle beam profile from a Black-Body radiator and a vibrating wire resonator is measured using a quasiparticle camera which consists of 25 tuning forks. The vibrating wire resonator is found to have a very thinly spread beam at velocities …
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Phonon and quasiparticle dynamics in superconducting aluminum tunnel junctions
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-22T20:33:37Z No. of bitstreams: 1 1975_smith.pdf: 2937209 bytes, checksum: a366e37feb82eba87e80ccc35b07cbd7 (MD5)
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Quasiparticle calculations in atoms and many-body core-valence partitioning
… corrections, leading to polarizabilities and quasiparticle energies, which are electron addition (removal) energies corresponding to the lowest few unoccupied (highest few occupied) electron states. Issues of gauge symmetry, conservation laws, Fermion statistics (crossing symmetry), and …
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Quasiparticle calculations in atoms and many-body core-valence partitioning
… corrections, leading to polarizabilities and quasiparticle energies, which are electron addition (removal) energies corresponding to the lowest few unoccupied (highest few occupied) electron states. Issues of gauge symmetry, conservation laws, Fermion statistics (crossing symmetry), and …
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Phonon-quasiparticle interactions in dilute solutions of He3 in superfluid He4
Both the nature of phonon-quasiparticle interactions in dilute solutions of He3 in superfluid He4 and the role they play in determining the linear response prQperties of such solutions are examined. The vertices for phonon scattering and absorption by He3 quasiparticles as well as the effective …
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Nonequilibrium behaviour and quasiparticle heating in thin film superconducting microwave resonators
… I calculate numerically the steady-state quasiparticle and phonon distributions for various sources of power (sub-gap and above-gap photons and phonons, single frequency and broadband). Many new results emerge, a few of which are: the quasiparticle heating effects of microwave power, …
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Generalization of the BTK Theory to the Case of Finite Quasiparticle Lifetimes
… theory is developed based on the fact that the quasiparticle lifetime is finite as a result of the damping caused by the interactions. For this purpose, appropriate self-energy expressions and wave functions are inserted into the strong coupling version of the Bogoliubov equations and …
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Electronic excitations in branched conjugated oligomers: A quasiparticle view and tight-binding models
… to standing waves that represent quantum quasiparticles (excitons) scattered at the molecular vertices. Excitation energies can be found by solving a generalized "particle in the box" problem on the graph that represents the molecule. The transition dipoles can be calculated by counting …
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Linear and nonlinear edge dynamics and quasiparticle excitations in fractional quantum Hall systems
… such as the gapless edge modes and the gapped quasiparticle excitations in the bulk. We close this introductory part with a fourth chapter which presents a brief overview on the chiral Luttinger liquid theory. In the second part of this thesis we instead proceed to present our original results. …
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Phonon-Quasiparticle Interactions in Dilute Solutions of Helium-3 in Superfluid Helium-4
Made available in DSpace on 2015-05-12T21:41:51Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6910837.PDF: 3738795 bytes, checksum: d05611352ccb1c73625c42d04566eed5 (MD5) Previous issue date: 1968
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Quasiparticle bound states in normal metal/superconductor structures probed by scanning tunneling microscopy
… with suppressed superconductivity will support quasiparticle bound states, which can be measured spectroscopically. Using a custom-built cryogenic scanning tunneling microscopy system, we have probed the bound states of an NS system consisting of Au (N) droplets of nanometer dimensions in …
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Charge structure of a quasiparticle in graphite measured with inelastic X-ray scattering
… cloud that surrounds a test charge to form quasiparticles in graphite. We are able to watch the anisotropic charge structure of a quasiparticle as it is born and evolves in real-space and at 10 attosecond intervals. We then set the dynamical part in motion to test how rigidly the …
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A nanoscale probe of the quasiparticle band structure for two dimensional electron systems
… observation of Landau quantization and quasiparticle interference phenomena on this material enables their quantitative reconciliation - after two decades of their study on various materials. We use these observations to establish momentum-resolved scanning tunneling microscopy (MR-STM) …
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Visualisation of quantum turbulence in superfluid 3He-B using a novel 2D quasiparticle detector
Quantum turbulence is a conceptually simple form of turbulence, consisting of a tangle of quantised vortex lines. It provides a model system, through which it may be possible to understand features of the complex and not yet fully understood classical turbulence. A novel detector made from arrays …
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QCD equation of state of hot deconfined matter at finite baryon density : a quasiparticle perspective
The quasiparticle model, based on quark and gluon degrees of freedom, has been developed for the description of the thermodynamics of a hot plasma of strongly interacting matter which is of enormous relevance in astrophysics, cosmology and for relativistic heavy-ion collisions as well. In the …
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A photoemission study of quasiparticle excitations, electron-correlation effects and magnetization dynamics in thin magnetic systems
This thesis is focused on the electronic, spin-dependent and dynamical properties of thin magnetic systems. Photoemission-related techniques are combined with synchrotron radiation to study the spin-dependent properties of these systems in the energy and time domains. In the first part of this …
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