Quantum Dynamics In A Weakly Interacting Fermi Gas
Bibliographic record
Abstract
In recent years, the study of non-equilibrium many-body quantum systems is gaining a great deal of attention. Even though many-body systems are made of individual particles, interactions can modify the single-particle behavior and give rise to emergent collective phenomena that bear little resemblance to the behavior exhibited by few-particle systems. However, the theoretical understanding of the non-equilibrium dynamics of an interacting many-body system is limited and many open questions remain. Ultracold atomic and molecular gases, with precisely controllable settings, are becoming fruitful platforms to investigate emergent behaviors in out-of-equilibrium systems. In this thesis, we focus on the study of non-equilibrium dynamics in weakly interacting Fermi gases. We study a non-equilibrium transition between two dynamical phases in a Fermi gas trapped in a spin-dependent harmonic potential. Such transition, which was predicted to exist but not yet directly measured in quenched s-wave superconductors, has been experimentally observed at the University of Toronto. We then discuss the dynamics of weakly interacting fermions in a 3D optical lattice clock and discover that the interplay between interactions and spin-orbit coupling, two detrimental effects in optical lattice clocks, can lead to a high-entangled state which could significantly enhance the precision and the accuracy of a clock. We also study the dynamics of a weakly interacting gas of polar molecules that feature undesirable chemical reactions. While these reactions have been an obstacle for the use of polar molecules as quantum simulators of many-body physics, we investigate the suppression of the chemical reaction rate recently observed when the molecules are prepared deep in the quantum degenerate regime.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".