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  Imaging phonon-mediated hydrodynamic flow in WTe2

Vool, U., Hamo, A., Varnavides, G., Wang, Y., Zhou, T. X., Kumar, N., et al. (2021). Imaging phonon-mediated hydrodynamic flow in WTe2. Nature Physics, 1-8. doi:10.1038/s41567-021-01341-w.

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 Creators:
Vool, Uri1, Author
Hamo, Assaf1, Author
Varnavides, Georgios1, Author
Wang, Yaxian1, Author
Zhou, Tony X.1, Author
Kumar, Nitesh2, Author           
Dovzhenko, Yuliya1, Author
Qiu, Ziwei1, Author
Garcia, Christina A. C.1, Author
Pierce, Andrew T.1, Author
Gooth, Johannes3, Author           
Anikeeva, Polina1, Author
Felser, Claudia4, Author           
Narang, Prineha1, Author
Yacoby, Amir1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Nanostructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_3018212              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: In the presence of interactions, electrons in condensed-matter systems can behave hydrodynamically, exhibiting phenomena associated with classical fluids, such as vortices and Poiseuille flow1–3. In most conductors, electron–electron interactions are minimized by screening effects, hindering the search for hydrodynamic materials; however, recently, a class of semimetals has been reported to exhibit prominent interactions4,5. Here we study the current flow in the layered semimetal tungsten ditelluride by imaging the local magnetic field using a nitrogen-vacancy defect in a diamond. We image the spatial current profile within three-dimensional tungsten ditelluride and find that it exhibits non-uniform current density, indicating hydrodynamic flow. Our temperature-resolved current profile measurements reveal a non-monotonic temperature dependence, with the strongest hydrodynamic effects at approximately 20 K. We also report ab initio calculations showing that electron–electron interactions are not explained by the Coulomb interaction alone, but are predominantly mediated by phonons. This provides a promising avenue in the search for hydrodynamic flow and prominent electron interactions in high-carrier-density materials.

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Language(s): eng - English
 Dates: 2021-09-162021-09-16
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1038/s41567-021-01341-w
Other: Vool2021
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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 8 Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850