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arXiv · 2604.15062

Kinetic simulation of magnetic-field-tuned hydrodynamic electron transport in graphene corbino disk

Chuang Zhang·Meng Lian·Hong Liang·Xiaokang Li·Zhaoli Guo·JingTao Lü
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Abstract

Hydrodynamic electron transport, in which electrical transport in solids resembles fluid hydrodynamics when momentum-conserving electron-electron scattering dominates, has attracted much attention over the past decade. However, its thermal aspects have received considerably less attention. In this paper, electron transport in a graphene Corbino disk is systematically simulated by solving the stationary Boltzmann transport equation with a dual-relaxation-time Callaway model, where momentum-conserving and momentum-relaxing scatterings are explicitly distinguished. By varying the magnetic field intensity and the scattering rates, the electric charge and heat flux responses are compared across the diffusive-to-hydrodynamic crossover under electric-field or temperature-gradient drives. It is shown that magnetic-field-induced deflection of both fluxes is strongly enhanced in the hydrodynamic regime but nearly suppressed in the diffusive regime. Under electric-field driving, a pronounced temperature rise is observed in the hydrodynamic regime due to reduced dissipation, while the diffusive regime remains nearly isothermal. Under temperature-gradient driving, the deflection is reversed relative to the electric-field case. These findings establish that thermal behaviors could provide a sensitive and independent diagnostic of electron hydrodynamics, with the magnetic field being identified as an effective discriminator between collective and dissipative conduction.

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Chuang Zhang, Meng Lian, Hong Liang, Xiaokang Li, Zhaoli Guo, JingTao Lü. 2026-04-16. Kinetic simulation of magnetic-field-tuned hydrodynamic electron transport in graphene corbino disk. https://arxiv.org/abs/2604.15062

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