Odd-parity effect and scale-dependent viscosity in atomic quantum gases
arXiv:2408.02738 · doi:10.1038/s42005-025-02231-w
Abstract
Two-dimensional electron gases are predicted to possess an anomalous ''tomographic'' transport regime that is marked by an odd-even effect in the relaxation times, with odd-parity deformations of the Fermi surface becoming long-lived in comparison to even-parity ones. In this work, we establish that neutral two-component atomic Fermi gases also exhibit this tomographic effect. By diagonalizing the Fermi liquid collision integral, we identify odd-parity modes with anomalously long lifetimes below temperatures , which is within reach of cold atom experiments. Furthermore, in contrast to electron gases, we find that the odd-even effect in neutral gases is widely tuneable with interactions along the BCS-BEC crossover and is suppressed on the BEC side. We propose as an experimental signature of the odd-even effect the damping rate of quadrupole oscillations, which is anomalously enhanced due to the presence of long-lived odd-parity modes. Our findings suggest that the dynamics of two-dimensional Fermi gases is richer than previously thought and should include additional long-lived modes.
9 pages, 2 figures. Supplementary material: 4 pages, 3 figures
References in corpus (34)
- Feshbach Resonances in Ultracold Gases
- Revealing the Superfluid Lambda Transition in the Universal Thermodynamics of a Unitary Fermi Gas
- Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
- Exploring the Thermodynamics of a Universal Fermi Gas
- From Few to Many: Observing the Formation of a Fermi Sea One Atom at a Time
- Collective Oscillations of an Imbalanced Fermi Gas: Axial Compression Modes and Polaron Effective Mass
- Repulsive Fermi polarons in a resonant mixture of ultracold Li atoms
- Kubo formulas for viscosity: Hall viscosity, Ward identities, and the relation with conductivity
- Confinement-Induced Resonances in Low-Dimensional Quantum Systems
- Two-Dimensional Homogeneous Fermi Gases
- Scale invariance and viscosity of a two-dimensional Fermi gas
- Boiling a Unitary Fermi Liquid
- Ground-state pressure of quasi-2D Fermi and Bose gases
- Equation of State of Ultracold Fermions in the 2D BEC-BCS Crossover Region
- Collective oscillations of a trapped Fermi gas near the unitary limit
- Thermodynamics of an attractive 2D Fermi gas
- Universal Sound Diffusion in a Strongly Interacting Fermi Gas
- Tomographic Dynamics and Scale-Dependent Viscosity in Two-Dimensional Electron Systems
- Quantum anomaly and 2D-3D crossover in strongly interacting Fermi gases
- The Hierarchy of Excitation Lifetimes in Two-Dimensional Fermi Gases
- Scale breaking and fluid dynamics in a dilute two-dimensional Fermi gas
- Shear viscosity and spin diffusion coefficient of a two-dimensional Fermi gas
- Shear viscosity and spin diffusion in a two-dimensional Fermi gas
- Shear viscosity and damping of collective modes in a two-dimensional Fermi gas
- Collective modes in interacting two-dimensional tomographic Fermi liquids
- Collective modes of a two-dimensional spin-1/2 Fermi gas in a harmonic trap
- Anomalously long lifetimes in two-dimensional Fermi liquids
- Emergent interaction-driven elliptic flow of few fermionic atoms
- Quantum critical thermal transport in the unitary Fermi gas
- Nonlocal conductivity, continued fractions and current vortices in electron fluids
- Damping of the quadrupole mode in a two-dimensional Fermi gas
- Nonlinear thermoelectric probes of anomalous electron lifetimes in topological Fermi liquids
- Collective modes of an imbalanced unitary Fermi gas
- Accelerating analysis of Boltzmann equations using Gaussian mixture models: Application to quantum Bose-Fermi mixtures