How heat propagates in liquid 3He
Abstract In Landau’s Fermi liquid picture, transport is governed by scattering between quasi-particles. The normal liquid 3He conforms to this picture but only at very low temperature. Here, we show that the deviation from the standard behavior is concomitant with the fermion-fermion scattering time...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-02-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-46079-0 |
| _version_ | 1797274118302728192 |
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| author | Kamran Behnia Kostya Trachenko |
| author_facet | Kamran Behnia Kostya Trachenko |
| author_sort | Kamran Behnia |
| collection | DOAJ |
| description | Abstract In Landau’s Fermi liquid picture, transport is governed by scattering between quasi-particles. The normal liquid 3He conforms to this picture but only at very low temperature. Here, we show that the deviation from the standard behavior is concomitant with the fermion-fermion scattering time falling below the Planckian time, $$\frac{\hslash }{{k}_{{{{{{{{\rm{B}}}}}}}}}T}$$ ℏ k B T and the thermal diffusivity of this quantum liquid is bounded by a minimum set by fundamental physical constants and observed in classical liquids. This points to collective excitations (a sound mode) as carriers of heat. We propose that this mode has a wavevector of 2k F and a mean free path equal to the de Broglie thermal length. This would provide an additional conducting channel with a T 1/2 temperature dependence, matching what is observed by experiments. The experimental data from 0.007 K to 3 K can be accounted for, with a margin of 10%, if thermal conductivity is the sum of two contributions: one by quasi-particles (varying as the inverse of temperature) and another by sound (following the square root of temperature). |
| first_indexed | 2024-03-07T14:53:47Z |
| format | Article |
| id | doaj.art-afb74616c45e4fa8ae69e5ec0dee4639 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-07T14:53:47Z |
| publishDate | 2024-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-afb74616c45e4fa8ae69e5ec0dee46392024-03-05T19:32:37ZengNature PortfolioNature Communications2041-17232024-02-011511710.1038/s41467-024-46079-0How heat propagates in liquid 3HeKamran Behnia0Kostya Trachenko1Laboratoire de Physique et d’Étude des Matériaux, (ESPCI - CNRS - Sorbonne Université), PSL Research UniversitySchool of Physical and Chemical Sciences, Queen Mary University of LondonAbstract In Landau’s Fermi liquid picture, transport is governed by scattering between quasi-particles. The normal liquid 3He conforms to this picture but only at very low temperature. Here, we show that the deviation from the standard behavior is concomitant with the fermion-fermion scattering time falling below the Planckian time, $$\frac{\hslash }{{k}_{{{{{{{{\rm{B}}}}}}}}}T}$$ ℏ k B T and the thermal diffusivity of this quantum liquid is bounded by a minimum set by fundamental physical constants and observed in classical liquids. This points to collective excitations (a sound mode) as carriers of heat. We propose that this mode has a wavevector of 2k F and a mean free path equal to the de Broglie thermal length. This would provide an additional conducting channel with a T 1/2 temperature dependence, matching what is observed by experiments. The experimental data from 0.007 K to 3 K can be accounted for, with a margin of 10%, if thermal conductivity is the sum of two contributions: one by quasi-particles (varying as the inverse of temperature) and another by sound (following the square root of temperature).https://doi.org/10.1038/s41467-024-46079-0 |
| spellingShingle | Kamran Behnia Kostya Trachenko How heat propagates in liquid 3He Nature Communications |
| title | How heat propagates in liquid 3He |
| title_full | How heat propagates in liquid 3He |
| title_fullStr | How heat propagates in liquid 3He |
| title_full_unstemmed | How heat propagates in liquid 3He |
| title_short | How heat propagates in liquid 3He |
| title_sort | how heat propagates in liquid 3he |
| url | https://doi.org/10.1038/s41467-024-46079-0 |
| work_keys_str_mv | AT kamranbehnia howheatpropagatesinliquid3he AT kostyatrachenko howheatpropagatesinliquid3he |