# Dr. Tyler Neely

### ARC Future Fellow / Senior Lecturer

Dr Neely completed his B.S. in Physics and Mathematics at the University of Oregon. He then attended the University of Arizona's College of Optical Sciences. In Arizona, he worked on experiments investigating superfluid vortices and superfluid turbulence in Bose-Einstein Condensates (BECs), in the group of Prof. Brian Anderson. On completing his PhD he was a postdoc at the National Institute of Standards and Technology (NIST) in Boulder, Colorado, where he investigated the application of frequency combs to mid-infrared spectroscopy in the group of Dr. Scott Diddams.

At the University of Queensland, he leads an experimental group focused on ultracold gases and BECs. He is also an Associate Investigator in the ARC Centre of Excellence for Engineered Quantum Systems (EQUS).

### 2020

A large ensemble of quantum vortices in a superfluid may itself be treated as a novel kind of fluid that exhibits anomalous hydrodynamics.

### 2019

We experimentally realize a highly tunable superfluid oscillator circuit in a quantum gas of ultracold atoms and develop and verify a simple lumped-element description of this circuit.

Adding energy to a system through transient stirring usually leads to more disorder. In contrast, point-like vortices in a bounded two-dimensional fluid are predicted to reorder above a certain energy, forming persistent vortex clusters.

### 2018

Rapidly scanning magnetic and optical dipole traps have been widely utilized to form time-averaged potentials for ultracold quantum gas experiments.

Conventional wisdom is that quantum effects will tend to disappear as the number of quanta in a system increases, and the evolution of a system will become closer to that described by mean-field classical equations.

### 2017

Structured light refers to the generation and application of custom light fields. As the tools and technology to create and detect structured light have evolved, steadily the applications have begun to emerge.

### 2016

The development of novel trapping potentials for degenerate quantum gases has been an important factor driving experimental progress in the field. The introduction of spatial light modulators (SLMs) into quantum gas laboratories means that a range of configurable geometries are now possible.

Interferometric measurements with matter waves are established techniques for sensitive gravimetry, rotation sensing, and measurement of surface interactions, but compact interferometers will require techniques based on trapped geometries.

### 2014

We describe a magnetic coil design utilizing concentrically wound electro-magnetic insulating (EMI) foil (25.4 μm Kapton backing and 127 μm thick layers). The magnetic coils are easily configurable for differentcoil sizes, while providing large surfaces for low-pressure (0.12 bar) water cooling.

### ARC Future Fellowship - Turbulent Cascades in Superfluid Flatland (2020-2024)

This ARC funded Future Fellowship project will determine how vortex dynamics redistribute energy across broad length scales in superfluids, how turbulence arises from instabilities, and how turbulence redistributes energy in multicomponent superfluids. The results will be beneficial to the understanding of the physics of quantum superfluids, and will inform the engineering of quantum-enhanced devices that utilise trapped superfluid media for precision sensing.

### ARC Centre of Excellence for Engineered Quantum Systems (EQUS) (2011–2022)

Abstract: The future of technology lies in controlling the quantum world. The ARC Centre of Excellence for Engineered Quantum Systems (EQuS) will deliver the building blocks of future quantum technologies and, critically, ensure Australian primacy in this endeavour. Three strategic research programs will target Quantum Measurement and Control; Synthetic Quantum Systems and Simulation; and Quantum-Enabled Sensors and Metrology.

### ARC Discovery Projects: Riding a quantum wave: transport and flow of atomic quantum fluids (2015–2018)

Abstract: In our lab, we use lasers and magnetic fields to cool tiny samples of millions of atoms to temperatures a few billionths of a degree above absolute zero. At such cold temperatures they form a superfluid known as a Bose-Einstein condensate, that flows with zero viscosity. Using tailored light fields to trap and guide the atoms, we will build rudimentary atomic circuits, and coax the superfluid to flow through a channel between two reservoirs, firstly with thermodynamic gradients, and secondly by building a quantum pump.

### ARC Discovery Projects: Spin vortex dynamics in a ferromagnetic superfluid (2020-2023)

Magnetic spin vortices are stable whirlpool-like objects that can spontaneously form when magnetic materials are rapidly cooled. This project aims to understand and manipulate spin vortices in a magnetic quantum fluid, one of the cleanest and most controllable magnetic systems. The significance is that spin vortices are potentially fundamental elements of future electronic technologies for advanced storage and logic. The expected outcomes are the ability to create spin vortices on demand, and the characterisation of their suitability for future applications.

### Making, Probing, and Understanding Two-Dimensional Quantum Turbulence

Marsden Fund (Wellington) grant#UOO1726 (2018-2021), CI Dr Ashton Bradley, PIs Dr Tyler W Neely and Prof. Brian P Anderson (University of Arizona).

### Optimised trapping technology for atomtronic circuits and biological systems (2017)

With our succesful implementation of DMD-based optical trapping, we received a seed funding grant to collaborate with Dr. Jinyang Liang of INRS (Quebec). This goal of this grant was to develop techniques for the optimisation of greyscale DMD potentials.