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Imaging phonon-mediated hydrodynamic flow in WTe2 with cryogenic quantum magnetometry | Uri Vool
; Assaf Hamo
; Georgios Varnavides
; Yaxian Wang
; Tony X. Zhou
; Nitesh Kumar
; Yuliya Dovzhenko
; Ziwei Qiu
; Christina A. C. Garcia
; Andrew T. Pierce
; Johannes Gooth
; Polina Anikeeva
; Claudia Felser
; Prineha Narang
; Amir Yacoby
; | Date: |
9 Sep 2020 | Abstract: | In the presence of strong interactions, electrons in condensed matter systems
can behave hydrodynamically thereby exhibiting classical fluid phenomena such
as vortices and Poiseuille flow. While in most conductors large screening
effects minimize electron-electron interactions, hindering the search for
possible hydrodynamic candidate materials, a new class of semimetals has
recently been reported to exhibit strong interactions. In this work, we study
the current flow in the layered semimetal tungsten ditelluride (WTe2) by
imaging the local magnetic field above it using a nitrogen-vacancy (NV) defect
in diamond. Our cryogenic scanning magnetometry system allows for
temperature-resolved measurement with high sensitivity enabled by the long
defect spin coherence. We directly measure the spatial current profile within
WTe2 and find it differs substantially from the uniform profile of a Fermi
liquid, indicating hydrodynamic flow. Furthermore, our temperature-resolved
current profile measurements reveal an unexpected non-monotonic temperature
dependence, with hydrodynamic effects strongest at ~20 K. We further elucidate
this behavior via ab initio calculations of electron scattering mechanisms,
which are used to extract a current profile using the electronic Boltzmann
transport equation. These calculations show quantitative agreement with our
measurements, capturing the non-monotonic temperature dependence. The
combination of experimental and theoretical observations allows us to
quantitatively infer the strength of electron-electron interactions in WTe2. We
show these strong electron interactions cannot be explained by Coulomb
repulsion alone and are predominantly phonon-mediated. This provides a
promising avenue in the search for hydrodynamic flow and strong interactions in
high carrier density materials. | Source: | arXiv, 2009.04477 | Services: | Forum | Review | PDF | Favorites |
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