Now showing items 1-20 of 2047

• #### The 0-brane Action in a General D = 4 Supergravity Background ﻿

(Institute of Physics Publishing, 1999)
We begin by presenting the superparticle action in the background of N=2, D=4 supergravity coupled to n vector multiplets interacting via an arbitrary special Kahler geometry. Our construction is based on implementing ...
• #### 2d String Theory and the Non-Perturbative c=1 Matrix Model ﻿

(2020-05-15)
A valuable testing ground for exploring new features of string theory and quantum gravity is the duality between c=1 string theory and the c=1 matrix quantum mechanics, which has been explored for over 30 years. In this ...
• #### 3 W Continuous-Wave Room Temperature Single-Facet Emission From Quantum Cascade Lasers Based On Nonresonant Extraction Design Approach ﻿

(American Institute of Physics, 2009)
A strain-balanced, InP-based quantum cascade laser structure, designed for light emission at 4.6 $\mu$m using a new nonresonant extraction design approach, was grown by molecular beam epitaxy. Removal of the restrictive ...
• #### 3D Multicolor Super-Resolution Imaging Offers Improved Accuracy in Neuron Tracing ﻿

(Public Library of Science, 2012)
The connectivity among neurons holds the key to understanding brain function. Mapping neural connectivity in brain circuits requires imaging techniques with high spatial resolution to facilitate neuron tracing and high ...
• #### A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk ﻿

(Springer Nature, 1999)
The accurate measurement of extragalactic distances is a central challenge of modern astronomy, being required for any realistic description of the age, geometry and fate of the Universe. The measurement of relative ...
• #### 4d Spectra from BPS Quiver Dualities ﻿

(2013-09-26)
We attack the question of BPS occupancy in a wide class of 4d N = 2 quantum field theories. We first review the Seiberg-Witten approach to finding the low energy Wilsonian effective action actions of such theories. In ...
• #### A dipolar quantum gas microscope ﻿

(2019-05-17)
Quantum gas microscopy provides an exciting platform for the study of in situ atom-atom interactions. Recent advances in quantum gas microscopy have allowed the probing of the Bose-Hubbard and Fermi-Hubbard Hamiltonian ...
• #### A Fast 7Li-based Quantum Simulator ﻿

(2019-05-17)
The work presented in this thesis is the design and characterization of a new apparatus for quantum simulation using bosonic Lithium in optical lattices, along with proposals for simulations of the spin-1 Heisenberg model ...
• #### A Search for Sterile Neutrinos at the NOνA Far Detector ﻿

(2016-12-08)
NOνA is the current United States flagship long-baseline neutrino experiment designed to study the properties of neutrino oscillations. It consists of two functionally identical detectors each located 14.6 mrad off the ...
• #### A Thermochemical Cryogenic Buffer Gas Beam Source of ThO for Measuring the Electric Dipole Moment of the Electron ﻿

(2017-05-04)
The discovery of an electric dipole moment of the electron (eEDM) within a few orders of magnitude of the current best limit would reveal the existence of time-reversal symmetry (T) violating physics beyond the Standard ...
• #### A Transdimensional Perspective on Dark Matter ﻿

(2018-05-13)
Robust uncertainty propagation and marginalization over nuisance parameters is the key to per- form robust inference. This thesis introduces a transdimensional, hierarchical, threshold-free, and Bayesian inference framework. ...
• #### Ab initiotight-binding Hamiltonian for transition metal dichalcogenides ﻿

(American Physical Society (APS), 2015)
We present an accurate ab initio tight-binding Hamiltonian for the transition metal dichalcogenides, MoS2, MoSe2, WS2, WSe2, with a minimal basis (the d orbitals for the metal atoms and p orbitals for the chalcogen atoms) ...
• #### Absence of Anomalous Copper Vibrations in YBa2 Cu3O7−δ ﻿

(American Physical Society (APS), 1994)
We find a normal temperature dependence for the Doppler broadening of the 230-eV resonance in the neutron cross section of Cu65 atoms in YBa2Cu3O7 between 10 and 300 K. No abrupt changes in the copper momentum spectrum ...
• #### Absence of discontinuities in ion-channeling parameters for YBa2 Cu3O7−δ thin films ﻿

(American Physical Society (APS), 1997)
We have measured the ion-channeling minimum yield (χmin) and angular width (Ψ1/2) for Y, Ba, Cu, and O in 2000 Å (001)-oriented films of YBa2Cu3O7−δ on MgO. The measurements mapped out a 30 K region around the critical ...
• #### Absence of Disorder-Driven Metal-Insulator Transitions in Simple Holographic Models ﻿

(American Physical Society (APS), 2015)
We study electrical transport in a strongly coupled strange metal in two spatial dimensions at finite temperature and charge density, holographically dual to the Einstein-Maxwell theory in an asymptotically four-dimensional ...
• #### Absence of red structural color in photonic glasses, bird feathers, and certain beetles ﻿

(American Physical Society (APS), 2014)
Colloidal glasses, bird feathers, and beetle scales can all show structural colors arising from short-ranged spatial correlations between scattering centers. Unlike the structural colors arising from Bragg diffraction in ...
• #### Accelerations of Water Masers in NGC 4258 ﻿

(IOP Publishing, 2000)
The water masers in NGC4258 delineate the structure and dynamics of a sub-parsec-diameter accretion disk around a supermassive black hole. VLBA observations provide precise information about the positions in the plane of ...
• #### Accounting for inhomogeneous broadening in nano-optics by electromagnetic modeling based on Monte Carlo methods ﻿

(Proceedings of the National Academy of Sciences, 2014)
Many experimental systems consist of large ensembles of uncoupled or weakly interacting elements operating as a single whole; this is particularly the case for applications in nano-optics and plasmonics, including colloidal ...
• #### Acoustic buffeting by infrasound in a low vibration facility ﻿

(AIP Publishing, 2016)
Measurement instruments and fabrication tools with spatial resolution on the atomic scale require facilities that mitigate the impact of vibration sources in the environment. One approach to protection from vibration in a ...
• #### Activation energy study of electron transport in high performance short wavelengths quantum cascade lasers ﻿

(The Optical Society, 2010)
We present a method to study current paths through quantum cascade lasers (QCLs). The temperature dependence of the current is measured at a fixed voltage. At low temperatures we find activation energies that correspond ...