Research

Overview

I worked broadly on the theory of quantum many-body dynamics and statistical physics. This means that I worked to understand and characterize the rich set of universal behaviors that can occur when many quantum mechanical degrees of freedom (ex: qubits) are interacting and out of equilibrium. Such systems can be realized with recently developed quantum simulators and quantum processors, so this field has a healthy interplay of theory and experiment. In my research, I employed both state-of-the-art numerical simulations and mathematical approaches to gain an understanding of these systems.

Publications

My papers can also be found on arXiv and google scholar. My PhD thesis can be found here.

2023

• A. Morningstar, N. O'Dea, J. Richter, “Hydrodynamics in long-range interacting systems with center-of-mass conservation,” Phys. Rev. B 108, L020304.

• H. Ha, A. Morningstar, D. Huse, “Many-body resonances in the avalanche instability of many-body localization,” Phys. Rev. Lett. 130, 250405.

2022

• N. O'Dea, A. Morningstar, S. Gopalakrishnan, V. Khemani, “Entanglement and absorbing-state transitions in interactive quantum dynamics,” Phys. Rev. B 109, L020304.

• A. Morningstar, D. Huse, V. Khemani, “Universality classes of thermalization for mesoscopic Floquet systems,” Phys. Rev. B 108, 174303.

• L. Christakis, J. Rosenberg, R. Raj, S. Chi, A. Morningstar, D. Huse, Z. Yan, and W. Bakr, “Probing site-resolved correlations in a spin system of ultracold molecules,” Nature 614, 64-69.

• T. Micklitz, A. Morningstar, A. Altland, and D. Huse, “Emergence of Fermi's Golden Rule,” Phys. Rev. Lett. 129, 140402. Editor's suggestion. Featured in Physics Magazine.

• A. Morningstar and W. Bakr, “Anomalous fluid flow in quantum systems,” Science 376, 6594, 699-700.

• S. Gopalakrishnan, A. Morningstar, R. Vasseur, and V. Khemani, “Distinct universality classes of diffusive transport from full counting statistics,” Phys. Rev. B 109, 024417. Editor's suggestion.

2021

• M. Hauru, A. Morningstar, J. Beall, M. Ganahl, A. Lewis, and G. Vidal, “Simulation of quantum physics with Tensor Processing Units: brute-force computation of ground states and time evolution,” arXiv:2111.10466.

• A. Morningstar, M. Hauru, J. Beall, M. Ganahl, A. Lewis, V. Khemani, and G. Vidal, “Simulation of quantum many-body dynamics with Tensor Processing Units: Floquet prethermalization,” PRX Quantum 3, 020331. Editor's suggestion.

• A. Morningstar, L. Colmenarez, V. Khemani, D. Luitz, and D. Huse, “Avalanches and many-body resonances in many-body localized systems,” Phys. Rev. B 105, 174205. Editor's suggestion.

2020

• A. Morningstar, D. Huse, and J. Imbrie, “Many-body localization near the critical point,” Phys. Rev. B 102, 125134. Editor's suggestion.

• A. Morningstar, V. Khemani, and D. Huse, “Kinetically constrained freezing transition in a dipole-conserving system,” Phys. Rev. B 101, 214205.

2019

• E. Guardado-Sanchez, A. Morningstar, B. Spar, P. Brown, D. Huse, and W. Bakr, “Subdiffusion and Heat Transport in a Tilted Two-Dimensional Fermi-Hubbard System,” Phys. Rev. X 10, 011042.

• A. Morningstar and D. Huse, “Renormalization-group study of the many-body localization transition in one dimension,” Phys. Rev. B 99, 224205.

2018

• A. Morningstar and R. Melko, “Deep learning the Ising model near criticality,” J. Mach. Learn. Res. 18, 163.

Recorded Talks

• "Recent progress in our understanding of Many-Body Localization: Part 1," Kavli Institute for Theoretical Physics.

• "Subdiffusion and ergodicity breaking in systems with emergent or microscopic dipole-moment conservation," Perimeter Institute for Theoretical Physics.

• "Avalanches and many-body resonances in many-body localized systems," Institute for Basic Science.

Code

You can find some code I've written for research purposes on my GitHub.