Giant magnetoresistance of Dirac plasma in high-mobility graphene

The most recognizable feature of graphene's electronic spectrum is its Dirac point around which interesting phenomena tend to cluster. At low temperatures, the intrinsic behavior in this regime is often obscured by charge inhomogeneity but thermal excitations can overcome the disorder at elevat...

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Bibliographic Details
Published in:arXiv.org 2023-05
Main Authors: Na Xin, Lourembam, James, Kumaravadivel, P, Kazantsev, A E, Wu, Zefei, Mullan, Ciaran, Barrier, Julien, Geim, Alexandra A, Grigorieva, I V, Mishchenko, A, Principi, A, Falko, V I, Ponomarenko, L A, Geim, A K, Berdyugin, Alexey I
Format: Article
Language:English
Subjects:
Feature recognition
Fermions
Giant magnetoresistance
Graphene
High temperature
Holes (electron deficiencies)
Inhomogeneity
Low temperature
Magnetoresistivity
Plasma
Playgrounds
Room temperature
Scattering
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Summary:The most recognizable feature of graphene's electronic spectrum is its Dirac point around which interesting phenomena tend to cluster. At low temperatures, the intrinsic behavior in this regime is often obscured by charge inhomogeneity but thermal excitations can overcome the disorder at elevated temperatures and create electron-hole plasma of Dirac fermions. The Dirac plasma has been found to exhibit unusual properties including quantum critical scattering and hydrodynamic flow. However, little is known about the plasma's behavior in magnetic fields. Here we report magnetotransport in this quantum-critical regime. In low fields, the plasma exhibits giant parabolic magnetoresistivity reaching >100% in 0.1 T even at room temperature. This is orders of magnitude higher than magnetoresistivity found in any other system at such temperatures. We show that this behavior is unique to monolayer graphene, being underpinned by its massless spectrum and ultrahigh mobility, despite frequent (Planckian-limit) scattering. With the onset of Landau quantization in a few T, where the electron-hole plasma resides entirely on the zeroth Landau level, giant linear magnetoresistivity emerges. It is nearly independent of temperature and can be suppressed by proximity screening, indicating a many-body origin. Clear parallels with magnetotransport in strange metals and so-called quantum linear magnetoresistance predicted for Weyl metals offer an interesting playground to further explore relevant physics using this well-defined quantum-critical 2D system.
ISSN:2331-8422
DOI:10.48550/arxiv.2302.06863