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 machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".