Imaging phonon-mediated hydrodynamic flow in WTe2
- URL: http://arxiv.org/abs/2009.04477v2
- Date: Wed, 10 Nov 2021 17:58:23 GMT
- Title: Imaging phonon-mediated hydrodynamic flow in WTe2
- Authors: Uri Vool and Assaf Hamo and Georgios Varnavides and Yaxian Wang and
Tony X. Zhou and Nitesh Kumar and Yuliya Dovzhenko and Ziwei Qiu and
Christina A. C. Garcia and Andrew T. Pierce and Johannes Gooth and Polina
Anikeeva and Claudia Felser and Prineha Narang and Amir Yacoby
- Abstract summary: 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.
Our temperature-resolve current profile measurements reveal a non-monotonic temperature dependence, with the strongest hydrodynamic effects at approximately 20 K.
This provides a promising avenue in the search for hydrodynamic flow and prominent electron interactions in high-carrier-density materials.
- Score: 0.5325753548715747
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- 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 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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