Date of Award

Spring 1-1-2018

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

First Advisor

Dana Z. Anderson

Second Advisor

Murray J. Holland

Third Advisor

James K. Thompson

Fourth Advisor

Konrad W. Lehnert

Fifth Advisor

Kelvin H. Wagner

Abstract

The work of this dissertation falls into two broad categories. In the first part, I describe loading a single atom from a reservoir into a blue-detuned crossed vortex bottle beam trap using a dynamic 1D optical lattice. The lattice beams are frequency chirped using acousto-optic modulators, which causes the lattice to move along its axial direction and behave like an optical conveyor belt. A stationary lattice is initially loaded with approximately 6000 atoms from a reservoir, and the conveyor belt transports them 1.1 mm from the reservoir to a bottle beam trap, where a single atom is loaded via light-assisted collisions. Photon counting data confirm that an atom can be delivered and loaded into the bottle beam trap 13.1% of the time. In part II, I describe a theory and experiment in the field of atomtronics that displays a coherent gain mechanism for a triple-well matterwave transistor oscillator. I start with a well-established semi-classical description of an atomtronic transistor but model the system using a many-body formalism. The quantum model predicts interesting physics when the atoms flowing through the transistor have sufficiently low enough temperatures such that the motional state of a dipole oscillating BEC, placed in the transistor itself, couples atom transitions between high lying transistor energy eigenstates. In this regime, the coupling gives rise to a new gain mechanism that increases the flux of matterwaves flowing out of the transistor system, compared to when the coupling is absent. Our experiments suggest that the gain mechanism is coherent and increases the spread of matterwave momenta that flows out of the transistor.

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