Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrical and Thermal Transport at the Planckian Bound of Dissipation
  in the Hydrodynamic Electron Fluid of WP2   Materials with strongly-correlated electrons exhibit interesting phenomena
such as metal-insulator transitions and high-temperature superconductivity. In
stark contrast to ordinary metals, electron transport in these materials is
thought to resemble the flow of viscous fluids. Despite their differences, it
is predicted that transport in both, conventional and correlated materials, is
fundamentally limited by the uncertainty principle applied to energy
dissipation. Here we discover hydrodynamic electron flow in the Weyl-semimetal
tungsten phosphide (WP2). Using thermal and magneto-electric transport
experiments, we observe the transition from a conventional metallic state, at
higher temperatures, to a hydrodynamic electron fluid below 20 K. The
hydrodynamic regime is characterized by a viscosity-induced dependence of the
electrical resistivity on the square of the channel width, and by the
observation of a strong violation of the Wiedemann-Franz law. From
magneto-hydrodynamic experiments and complementary Hall measurements, the
relaxation times for momentum and thermal energy dissipating processes are
extracted. Following the uncertainty principle, both are limited by the
Planckian bound of dissipation, independent of the underlying transport regime.

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The categories of this paper are: hep-ph
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The categories of this paper are: cs
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex