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.
Results
Showing 1 to 20 of 22 for “"elementary excitations"”.
-
Elementary excitations in heavy-fermion superconductors
A theoretical study is presented of the elementary excitations in heavy-fermion superconductors, under the hypothesis that the Cooper pairs are in a relative p-wave or d-wave. First, all p-wave and d-wave states are classified in the presence of strong spin-orbit coupling and crystal fields, which …
-
Hybridized Criticality and Elementary Excitations in LiHoF4
… We construct a systematic framework for treating elementary excitations in this material across the phase diagram. These excitations interpolate between purely electronic, nuclear and lattice modes and exhibit two-types of quantum critical softening, both complete (as anticipated by elementary …
-
Polarization potentials and elementary excitations in strongly interacting quantum liquids
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-18T20:42:18Z No. of bitstreams: 1 1974_aldrich.pdf: 6105552 bytes, checksum: 3ec7bfd08456502a553458e19b2022dd (MD5)
-
Interacting Elementary Excitations in Ultrarelativistic Plasmas: Damping Mechanisms and Plasma Thermodynamics
This dissertation examines the properties of the elementary excitations in quark-gluon and electromagnetic plasmas. Due to Debye screening and Landau damping mechanisms, the interaction fields fall off at large distances, except for static magnetic and color-magnetic fields. The lack of screening …
-
Interaction elementary excitations in ultrarelativistic plasmas: damping mechanisms and plasma thermodynamics
This dissertation examines the properties of the elementary excitations in quark-gluon and electromagnetic plasmas. Due to Debye screening and Landau damping mechanisms, the interaction fields fall off at large distances, except for static magnetic and color-magnetic fields. The lack of screening …
-
Effective interactions, transport properties, and elementary excitations in helium three-helium four mixtures
A unified theory of effective interaction, elementary excitations, transport properties, and possible superfluidity of 3He-4He mixtures has been developed. The basic approach is patterned after that of Aldrich and Pines (AP) for pure 4He and 3He , 1n which the consequence of the strong interactions …
-
Nonlinear dissipative dynamics of optomechanical and laser arrays
… described by saturable gain. We investigate elementary excitations around the mean-field steady state and their consequences for the coherence properties. In particular, we show that the hybridization of chiral edge modes gives rise to long-lived elementary excitations, leading to large phase …
-
On the microscopic theory of liquid ⁴He
… microscopic description of the ground state and elementary excitations of liquid 4He is presented. The variational theory is used in conjunction with a perturbative scheme called correlated basis perturbation theory. The hypernetted-chain technique is used to calculate the various matrix …
-
Dynamics of Dissociative Chemisorption: Methane on Tungsten Single Crystal Surfaces
… of this study is to explore the nature of the elementary excitations which bring about dissociation and subsequent adsorption. Our effort has been concentrated upon studying the effect of thermal excitations of the gas as well as the importance of the crystal structure of the metal surface.
-
Bosonization and the many-body problem
… In chapter 5 I present the bosonization of elementary excitations of exactly solvable one dimensional systems with special emphasis on the Hubbard chain. Chapter 6 contains the conclusions.
-
Quantum Theory of Glasses
The quantum excitations in glasses have long presented a set of puzzles for condensed matter scientists. A common view is that they are largely disordered analogs of elementary excitations in crystals, supplemented by two level systems which are chemically local entities coming from disorder. This …
-
Simulation of curved-space quantum field theories with two-component Bose-Einstein condensates: from black-hole physics to cosmology
… the availability of various branches of elementary excitations with different sound speed and effective mass may in fact lead to advantages in the implementation of interesting geometries and, eventually, to the exploration of a broader spectrum of physical processes. We first consider …
-
Quantum properties of black hole
… that the Bogoliubov dispersion relation for the elementary excitations of the weakly-interacting N-gravitons is shown to hold for the case of the weakly-interacting Graviton gas or N weakly interacting gravitons. where both the cases of attraction and repulsion is taken into consideration between …
-
Applied fractionalization : quantum phases and phase transitions of strongly interacting systems
… proposed phenomena of 'fractionalization' where elementary excitations in a phase carry quantum numbers that are fractions of that corresponding to an electron. Similarly, there is growing numerical evidence of the theoretical phenomena of 'deconfined quantum criticality', where quantum Berry …
-
Correlated dynamics of quantum wires and cigar shaped atomic gases
In one- dimensional Fermi systems the elementary excitations,as predicted by Tomonaga- Luttinger liquid (TLL) theory, are spin and charge density waves, traveling at different velocities (the spin velocity is smaller, the charge velocity greater than the Fermi velocity). These velocities are …
-
Ultrafast photoinduced dynamics of low-dimensional excitonic materials at room temperature
… theoretically. Here, we use the frameworks of elementary excitations and symmetry breaking as starting points to understand two low-dimensional materials. With ultrafast spectroscopic measurements, we probe these materials at room temperature and in non-idealised regimes, building on where …
-
Single and multi-exciton dynamics in nanoscale semiconductors
… contribute to our understanding of the elementary excitations in organic and inorganic nanostructured semiconductors. It is our hope these insights will help guide the design of next generation devices utilizing nanoscale semiconductors.
-
Cold, dense quark matter
… CFL diquark condensates screen color charges of elementary excitations, a novel feature of the SU(3) color-flavor structure. We construct the dressing scheme inspired by the non-linear sigma model, and derive an effective theory in terms of baryons and mesons, a gauge-invariant theory that …
-
Machine Learning for Phonon Thermal Transport
… connections between symmetry, structure, and elementary excitations in condensed matter and material physics.
Page 1 of 2