Now showing items 21-40 of 242

• #### Beam Characterization and Systematics of the Bicep2 and Keck Array Cosmic Microwave Background Polarization Experiments ﻿

(2014-10-21)
Inflation, which posits an exponential expansion in the early universe, is well motivated since it resolves questions that are left unexplained by standard LCDM cosmology, such as the flatness and homogeneity of the universe. ...
• #### Biomolecules, Combinatorics, and Statistical Physics ﻿

(2019-05-13)
Motivated by the combinatorial properties of the protein-design problem and the specific and non-specific interactions in biomolecular systems, we build exactly-solved models for the statistical physics of the symmetric ...
• #### Bootstrapping High-Energy States in Conformal Field Theories ﻿

(2019-05-16)
We analyze the operator spectrum of Conformal Field Theories at large conformal dimensions $\Delta$ with and without global symmetries. General constraints of crossing symmetry and unitarity allow us to extract a number ...
• #### Brane Constructions and BPS Spectra ﻿

(2013-10-07)
The object of this work is to exploit various constructions of string theory and M-theory to yield new insights into supersymmetric theories in both four and three dimensions. In 4d, we extend work on Seiberg-Witten theory ...
• #### Building Single Molecules - Reactions, Collisions, and Spectroscopy of Two Atoms ﻿

(2019-05-21)
Recent theoretical and experimental advances have led to better understanding and control of simple molecules, bringing them to the forefront of quantum science. Diatomic polar molecules, with their vibrational and rotational ...
• #### Carving Out the Space of Conformal Field Theories ﻿

(2012-12-19)
We study the constraints of conformal symmetry and unitarity in Conformal Field Theories (CFTs). Crossing symmetry of four-point functions implies universal bounds on operator dimensions and three-point function coefficients. ...
• #### Channel Length Scaling in Microwave Graphene Field Effect Transistors ﻿

(2018-05-12)
In order to operate at microwave frequencies and higher, the channel length of a field effect transistor must be made very short ($\sim25$nm at 1THz) to minimize input capacitance and the drift time of carriers through the ...
• #### Chirality of Light and Its Interaction with Chiral Matter ﻿

(2013-03-18)
This thesis conducts a systematic study on the chirality of light and its interaction with chiral matter. In the theory section, we introduce a measure of local density of chirality, applying to arbitrary electromagnetic ...
• #### A Classical Perspective on Non-Diffractive Disorder ﻿

(2016-01-28)
The unifying themes connecting the chapters in this dissertation are the profound and often surprising effects of disorder in classical and quantum systems and the tremendous insight gained from a classical perspective, ...
• #### The Classical-Quantum Correspondence of Polyatomic Molecules ﻿

(2016-05-10)
In this thesis, we study the classical-quantum correspondence of polyatomic molecules to further understand their rotational and vibrational behavior. More specifically, we focus on two different scenarios: (1) completely ...
• #### Classification and Construction of Topological Phases of Quantum Matter ﻿

(2019-05-06)
We develop a theoretical framework for the classification and construction of symmetry protected topological (SPT) phases, which are a special class of zero-temperature phases of strongly interacting gapped quantum many-body ...
• #### Coherent control of diamond defects for quantum information science and quantum sensing ﻿

(2014-06-06)
Quantum mechanics, arguably one of the greatest achievements of modern physics, has not only fundamentally changed our understanding of nature but is also taking an ever increasing role in engineering. Today, the control ...
• #### Coherent Optical Control of Atom-Like Defects in Diamond: Probing Internal Dynamics and Environmental Interactions ﻿

(2017-09-07)
The nitrogen-vacancy (NV) center in diamond has emerged as a versatile atom-like system, finding diverse applications at both ambient and cryogenic temperatures. At room temperature, the NV center's spin-triplet electronic ...
• #### Coherent scattering in two dimensions: graphene and quantum corrals ﻿

(2014-02-25)
Two dimensional electronic materials provide a vibrant area for applying basic quantum mechanics and scattering theory. In quantum corrals, multiple scattering leads to resonances closely approximating eigenstates of an ...
• #### Collective Dynamics in Physical and Social Networks ﻿

(2016-05-03)
We study four systems where individual units come together to display a range of collective behavior. First, we consider a physical system of phase oscillators on a network that expands the Kuramoto model to include ...
• #### Conformal Bootstrap in Two Dimensions ﻿

(2016-05-18)
In this dissertation, we study bootstrap constraints on conformal field theories in two dimensions. The first half concerns two-dimensional (4,4) superconformal field theories of central charge c=6, corresponding to ...
• #### Constraining Primordial Gravitational Waves Using Present and Future CMB Experiments ﻿

(2019-05-17)
Cosmic inflation is our current best theory for what occurred in the universe in the first instances of time. It postulates a brief period of exponential expansion in which quantum fluctuations are magnified to cosmic size ...
• #### Controlling Atomic, Solid-State and Hybrid Systems for Quantum Information Processing ﻿

(2013-10-18)
Quantum information science involves the use of precise control over quantum systems to explore new technologies. However, as quantum systems are scaled up they require an ever deeper understanding of many-body physics ...
• #### Cooling, Collisions and non-Sticking of Polyatomic Molecules in a Cryogenic Buffer Gas Cell ﻿

(2014-10-21)
We cool and study trans-Stilbene, Nile Red and Benzonitrile in a cryogenic (7K) cell filled with low density helium buffer gas. No molecule-helium cluster formation is observed, indicating limited atom-molecule sticking ...
• #### Correlated Electron States in Coupled Graphene Double-Layer Heterostructures ﻿

(2019-01-16)
Graphene have grown to be a major experimental platform for studying two-dimensional (2D) physics due to its high quality, versatility and tunablity. Created by stacking graphene with other 2D materials, 2D heterostructures ...