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Vool, Uri; Assaf Hamo; Varnavides, Georgios; Wang, Yaxian; Zhou, Tony X; Kumar, Nitesh; Dovzhenko, Yuliya; Qiu, Ziwei; Garcia, Christina A C; Pierce, Andrew T; Gooth, Johannes; Anikeeva, Polina; Felser, Claudia; Narang, Prineha; Yacoby, Amir
arXiv.org, 11/2021Paper, Journal Article
In the presence of interactions, electrons in condensed-matter systems can behave hydrodynamically, exhibiting phenomena associated with classical fluids, such as vortices and Poiseuille flow. 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 interactions. 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-resolve 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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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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