Degree Date: December, 2020
Stephen Albright's picture
Stephen Albright
Charles Ahn

Ultra-thin Film Growth of Chalcogenides to Realize Novel Electronic Phenomena
Chalcogenides, compounds containing the elements S, Se, or Te, are a class of materials that includes those with two-dimensional materials properties that have been shown to exhibit novel electronic phenomena, including superconductivity and non-trivial topology. These properties are both intrinsically valuable to our continuing fundamental understanding of electronic behavior in materials and potentially useful in developing next-generation electronic devices. In this dissertation I describe... more
Supraja Balasubramanian's picture
Supraja Balasubramanian
Bonnie Fleming
Postdoctoral Associate

Fermi National laboratory

A Differential Cross-Section Measurement of Muon Neutrino-Induced Charged Current Neutral Pion Production in MicroBooNE
MicroBooNE is a liquid argon time projection chamber (LArTPC) on the Booster Neutrino Beam at Fermi National Laboratory. Its primary goals are to conduct a νe appearance search to investigate the nature of the anomalous low-energy excess of electromagnetic events observed by MiniBooNE, study neutrino-argon interactions, and conduct research and development for future large-scale argon based detectors such as DUNE. A significant background for MicroBooNE’s νe appearance measurement... more
Estella Barbosa de Souza's picture
Estella Barbosa de Souza
Reina Maruyama

Boston Consulting Group

A Model-Independent Search for Dark Matter-Induced Annual Modulation Signal with the COSINE-100 Experiment
Joshua Burt's picture
Joshua Burt
John Murray

Large-Scale Organization of Microcircuit Specialization in Human Cortex
Neural circuit dynamics across a range of spatiotemporal scales endow the brain with specialized computational capabilities that subserve human cognition and behavior. Technological advances and big data initiatives in recent years have revolutionized our understanding of the brain’s multi-scale architecture. Yet there remains a major disconnect in linking large-scale dynamics of networked neural systems to their underlying circuit mechanisms. Biophysically-based computational modeling of... more
Shany Danieli's picture
Shany Danieli
Pieter van Dokkum
NASA Hubble and Carnegie-Princeton Postdoctoral Fellow

Institute for Advanced Study

Clues to the Nature of Dark Matter from Low-Mass Galaxies Outside the Local Group
The primary motive for this thesis is the highly uncertain nature of dark matter, presumably the dominant substance in our universe. From an astronomical perspective, perhaps the perfect laboratories for investigating the nature of dark matter on small scales are low surface brightness, low mass galaxies. They are the most abundant type of galaxy in the universe. In the Local Group, they are found to be dark matter dominated and thus have larger portions of dark matter for their total mass. And... more
Max Hays's picture
Max Hays
Michel Devoret
Postdoctoral Associate

Yale University, Applied Physics

Realization of an Andreev spin qubit: Exploring the sub-gap structure of Josephson nanowires using circuit QED
A weak link between two superconductors hosts discrete, fermionic modes known as Andreev levels. They govern the physics of the weak link on the microscopic scale, ultimately giving rise to macroscopic phenomena such as the Josephson supercurrent. Conventional superconducting quantum circuits crucially rely on the nonlinearity of the supercurrent in Josephson tunnel junctions, which arises from the ground-state properties of millions of Andreev levels acting in concert. Yet fundamentally, each... more
Judith Hoeller's picture
Judith Hoeller
Nicholas Read
Postdoctoral Associate


Topological quantization of Berry phases in quantum and classical systems
Berry phases are known to occur for a spin 1/2 in a slowly varying magnetic field in quantum mechanics, and for the polarization of light in a gently twisted optical fiber in classical optics. Such Berry phases take on continuous values. I describe two systems in which Berry phases are topologically quantized to discrete values: (1) cold atoms in accelerated optical lattices, and (2) dissipative two level systems coupled to radiation with a slowly varying phase offset. (1) Cold atoms in... more
Scott Jensen's picture
Scott Jensen
Yoram Alhassid
Postdoctoral Associate

University of Illinois, Urbana-Champaign

Lattice Auxiliary-Field Quantum Monte Carlo Studies of the Unitary Fermi Gas
The Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) crossover has been experimentally realized using Feshbach resonance techniques with ultracold atomic Fermi gases of 6Li and 40K. In the middle of this crossover is the unitary Fermi gas (UFG), in which the s-wave scattering length diverges and interactions are strongest. The UFG has many interesting properties including a particularly high critical temperature for superfluidity Tc ~ 0.15 TF (in units of the Fermi temperature... more
William Sweeney's picture
William Sweeney
A. Douglas Stone
Data Scientist


Electromagnetic Eigenvalue Problems and Nonhermitian Effects in Linear and Saturable Scattering
In this thesis we address a series of new problems in non-hermitian optical scattering – linear and nonlinear – with increasing degrees of complexity. We develop the theory of reflectionless scattering modes (RSMs), introducing a novel and broad class of impedance-matched eigenproblems: for a given structure, find the incident wavefronts and frequencies which are not partially reflected at all, but are instead transmitted through the scatterer, or dissipated within it. The RSM... more
Hao Yan's picture
Hao Yan
Simon Mochrie

Positional Fluctuations in Synthetic and Living Polymer Systems
Chromatin organization is inextricably linked to its dynamics. The loop extrusion factor (LEF) model provides a framework for how topologically associating domains (TADs) arise: cohesin or condensin extrude DNA loops, until they encounter boundary elements, namely CTCF. However, a characteristic subdiffusive behavior of MSD is observed in fission yeast on the seconds timescale and experiments show that cohesin or condensin largely constrains chromatin mobility. Such finding is inconsistent with... more
Mengzhen Zhang's picture
Mengzhen Zhang
A. Douglas Stone
Postdoctoral Associate

University of Chicago

Properties and Applications of Gaussian Processes
Gaussian states, operations, and measurements are central building blocks for continuous-variable quantum information processing which paves the way for abundant applications, especially including network-based quantum computation and communication. To make the most use of the Gaussian processes, it is required to understand and utilize suitable mathematical tools such as the symplectic space, symplectic algebra, and Wigner representation. Applying these mathematical tools to practical quantum... more
Degree Date: May, 2020
Robert Blum's picture
Robert Blum
Sean Barrett
Postdoctoral Associate (Barrett)

Yale University

Applying novel NMR techniques to many-body spin systems, and novel reconstruction techniques to NMR data
This experimental thesis focuses on two distinct themes: developing NMR techniques to probe many-body spin systems, and extracting the maximum amount of information from the minimum amount of data. For the first theme, I describe the first NMR observations of discrete time crystal signatures. A discrete time crystal (DTC) is a many-body quantum state where a driven system exhibits discrete time translational symmetry breaking. A surprising aspect of our DTC signatures is that they were detected... more
Luke Burkhart's picture
Luke Burkhart
Rob Schoelkopf
Postgraduate Associate

Yale University, Applied Physics

Error-Detected Networking for 3D Circuit Quantum Electrodynamics
Quantum machines have the potential to serve as groundbreaking tools for scientific discovery in the coming decades. As the complexity of these devices increases, it may be necessary to borrow ideas from complex classical systems, and build them in a modular fashion, with independently designed, optimized, and tested components, networked together into a functioning whole. To build a modular machine from superconducting circuits requires the ability to perform operations between quantum bits... more
Christopher Davis's picture
Christopher Davis
Reina Maruyama
Senior Data Scientist


Search for Neutrinoless Double Beta Decay with Majoron Emission in CUORE
This thesis describes a search performed at the Cryogenic Underground Observatory for Rare Events (CUORE) for Majoron-emitting neutrinoless double-beta decays. A discovery of any form of neutrinoless double-beta decay would be of immense importance to the field of physics, as any mechanism by this decays occurs would require physics beyond the Standard Model. In addition, neutrinoless double-beta decays, including type I Majoron models, would show that lepton number is not a conserved... more
Arpit Dua's picture
Arpit Dua
Meng Cheng & Liang Jiang
UQM-IQIM Postdoctoral scholar


Structure of fracton stabilizer models
In recent years the study of topological phases of matter has moved to the forefront of theoretical condensed matter physics. This has been fueled in part by the theorized existence of exotic phases of matter that can serve as topological quantum memories and computers. The classification of topological phases of matter in two spatial dimensions in terms of anyon theories, or modular tensor categories, and chiral central charges forms the cornerstone of the subject. For the special case of 2D... more