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 210 for “"fermions"”.
-
Dynamics of Chiral Fermions
… quantum field theories containing Weyl fermions respecting some chiral symmetry. There are severe challenges in lattice regularising such theories and chiral gauge theories, where a non-anomolous chiral symmetry is gauged, can display interesting strong coupling dynamics such as …
-
Interacting fermions : a holographic approach/
Most materials are either metals or insulators. When they are metals, their electronic properties are usually described by Landau's Fermi liquid theory. That is, they behave more or less like a free Fermi gas, with a few modifications due to electron-electron interactions. However, there exist a …
-
Strongly coupled fermions on the lattice
… states by coupling them to additional composite fermions. These composite fermions would arise as bound states via an auxiliary Yukawa interaction. Hence in the continuum limit mirror modes will be forced to decouple from the spectrum without breaking chiral symmetry. This proposal led to many …
-
Interdimensional effects in systems of fermions
Over the past decade, new materials have been theoretically predicted and experimentally verified which are favourable candidates in the field of spintronics. These materials include topological insulators, graphene, and heterostructure materials with large Rashba spin-orbit coupling along an …
-
Microscopic Simulations of Strongly Paired Fermions
Results for the aforementioned observables are also given for the case of low-density neutron matter, which is characterized by a finite effective range and a more complicated interaction. These results are also compared with our cold-atom predictions and also with other many-body approaches to …
-
Engineering relativistic fermions in condensed matter systems
… properties. We first study two-dimensional Dirac fermions in graphene. Specifically, we explore the opportunity to artificially engineer superlattice Dirac fermions (SDF) by placing graphene on self-assembled nanospheres. We use a tight-binding model to understand the effect of the lattice …
-
Strongly-interacting fermions in an optical lattice
… obtained the first evidence of superfluidity of fermions in an optical lattice. A loss in phase coherence occurred when the lattice depth was increased past a critical value, possibly signaling a transition to an insulating state. Further preliminary explorations of this novel system is described …
-
Quantum gas microscopy of strongly correlated fermions
… describes quantum gas microscopy of ultracold fermions. This enables one to simulate the Fermi-Hubbard model, a prototypical strongly correlated model, with site-resolved detectioi and control capablities. A new apparatus that can detect fermionic 40K in a square lattice with single-site …
-
Dynamical C*-Algebras and Quadratic Perturbations for Fermions
We study interacting Fermionic fields on globally hyperbolic spacetimes in the context of dynamical C*-algebras. Our focus is on a particular class of interactions, that of kinetic perturbations; we provide their definition and we show that these induce, in the fermionic dynamical C*-algebra, …
-
TOWARDS ULTRACOLD FERMIONS IN 2D DISORDERED OPTICAL LATTICES
… many-body physics with ultracold lithium-6 fermions in a two dimensional disordered optical lattice governed by the Fermi-Hubbard model.
-
Controlling ultracold fermions under a quantum gas microscope
This thesis presents the experimental work on building a quantum gas microscope, employing fermionic 40K atoms in an optical lattice, and precision control of the atoms under the microscope. This system works as a natural simulator of the 2D Hubbard model, which describes materials with strongly …
-
Studies of strongly-correlated fermions in an optical lattice
… of the nature of strongly-correlated fermions in a minimal setting. This thesis describes two such studies. In the first, we observe the momentum relaxation of strongly-correlated fermions in the absence of disorder. We find a violation of the weak-scattering prediction for the scaling …
-
Fermions at finite density in the nonrelativistic gauge/gravity duality
The AdS/CFT correspondence has provided a new tool to investigate strongly correlated systems in condensed matter physics. This thesis presents the computation of retarded fermion Green functions at finite density and zero temperature in the nonrelativistic gauge/gravity duality. We find evidence …
-
A cluster algorithm for Gross-Neveu fermions at nonzero temperature
… results of lattice simulations of Gross-Neveu fermions in 1+1 dimensions. We re derive the representation of N flavors of Wilson fermions in terms of Ising spins on a 1 + 1 dimensional lattice from [1]. We re implement the cluster algorithm of [1] for N flavors of free fermions and verify it …
-
Homogeneous quantum gases: strongly interacting fermions and rotating bosonic condensates
Quantum gases are an ideal platform for studying problems in many-body physics. Highly tunable and reconfigurable, these systems work as quantum simulators for a range of other quantum mechanical systems, ranging from neutron stars, to superconductors, to quantum Hall systems. A crucial degree of …
-
Fermions in Yang-Mills gauge theories: invariance, covariance and topology
… properties of the Dirac operator describing fermions in Yang-Mills fields. This includes the study of anomalies of the gauge currents. We are particularly interested in the geometric and topological features in the problem. The complicated topological structures and properties present in …
-
Precision Lattice Calculation of Kaon Decays with Möbius Domain Wall Fermions
… and implementation of the Möbius domain wall fermions. These new technologies make it practical to simulate large 48³ × 96 and 64³ × 128 lattice ensembles with (5.5fm)³ boxes and 140MeV pion. The calculation was performed using the Möbius domain wall fermions and the Iwasaki gauge action. …
-
Magic and Majorana Fermions in Quantum Computing, Topological Matter, and Dynamics
… the resource of “magic”, and the use of Majorana fermions, in quantum many-body physics and quantum computing. Along with other quantum resources, magic helps determine the advantage that a quantum circuit can display over classical computation. For the components of the quantum computer itself, …
Page 1 of 11