Odd-parity effect and scale-dependent viscosity in atomic quantum gases
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 establi...
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Nature Portfolio
2025-08-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-025-02231-w |
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| author | Jeff Maki Ulf Gran Johannes Hofmann |
| author_facet | Jeff Maki Ulf Gran Johannes Hofmann |
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| description | 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 T≤0.15T F , 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. |
| format | Article |
| id | doaj-art-a69e4b165e5e40f6b29f2bba54f2a610 |
| institution | Kabale University |
| issn | 2399-3650 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj-art-a69e4b165e5e40f6b29f2bba54f2a6102025-08-20T03:43:11ZengNature PortfolioCommunications Physics2399-36502025-08-01811710.1038/s42005-025-02231-wOdd-parity effect and scale-dependent viscosity in atomic quantum gasesJeff Maki0Ulf Gran1Johannes Hofmann2Department of Physics, University of KonstanzDepartment of Physics, Chalmers University of TechnologyDepartment of Physics, Gothenburg UniversityAbstract 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 T≤0.15T F , 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.https://doi.org/10.1038/s42005-025-02231-w |
| spellingShingle | Jeff Maki Ulf Gran Johannes Hofmann Odd-parity effect and scale-dependent viscosity in atomic quantum gases Communications Physics |
| title | Odd-parity effect and scale-dependent viscosity in atomic quantum gases |
| title_full | Odd-parity effect and scale-dependent viscosity in atomic quantum gases |
| title_fullStr | Odd-parity effect and scale-dependent viscosity in atomic quantum gases |
| title_full_unstemmed | Odd-parity effect and scale-dependent viscosity in atomic quantum gases |
| title_short | Odd-parity effect and scale-dependent viscosity in atomic quantum gases |
| title_sort | odd parity effect and scale dependent viscosity in atomic quantum gases |
| url | https://doi.org/10.1038/s42005-025-02231-w |
| work_keys_str_mv | AT jeffmaki oddparityeffectandscaledependentviscosityinatomicquantumgases AT ulfgran oddparityeffectandscaledependentviscosityinatomicquantumgases AT johanneshofmann oddparityeffectandscaledependentviscosityinatomicquantumgases |