Magnetohydrodynamics and electro-electron interaction of massless Dirac fermions
D. A. Khudaiberdiev, G. M. Gusev, E. B. Olshanetsky, Z. D. Kvon, and, N. N. Mikhailov
TL;DR
This paper investigates the magnetotransport properties of massless Dirac fermions in HgTe quantum wells, revealing electron viscosity effects and quantifying electron-electron interaction through shear stress relaxation time.
Contribution
It provides experimental evidence of electron viscosity in Dirac fermions and quantifies electron-electron scattering effects in HgTe quantum wells.
Findings
Observation of large negative magnetoresistance with Lorentzian profile
Identification of electron viscosity as a key transport mechanism
Quantification of shear stress relaxation time due to electron-electron interactions
Abstract
The magnetotransport properties of massless Dirac fermions in a gapless HgTe quantum well are investigated. In samples with narrow channels, a large negative magnetoresistance with a Lorentzian profile is observed, which is interpreted as a manifestation of electron viscosity due to electron-electron interaction. Comparison of experiment with theory yields the shear stress relaxation time of the Dirac fermions caused by electron-electron scattering.
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