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Ab initio study of Coulomb drag driven electron-hole bifluidity in doped graphene

Dwaipayan Paul*, Elena Trukhan†, and Nakib H. Protik‡

  • *Contact author: dwaipayan.paul@hu-berlin.de
  • †Contact author: elena.trukhan@physik.hu-berlin.de
  • ‡Contact author: nakib.protik@physik.hu-berlin.de
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Phys. Rev. B 114, L051405 – Published 20 July, 2026

DOI: https://doi.org/10.1103/q4mx-9tmn

Abstract

Motivated by the notion that a preponderance of Coulomb interactions might lead to hydrodynamics, we carry out an ab initio calculation of the charge-carrier transport properties of the electron-hole gas of doped graphene. We include both the phonon and Coulomb interactions within a momentum and band-resolved Boltzmann transport formalism. We find that under suitable conditions, the strong Coulomb drag effect induces phenomena like negative conductivity and joint electron-hole hydrodynamics (bifluidity) in the system. We also identify the exclusive electron or hole hydrodynamics. We find that there is a strong violation of the Wiedemann-Franz law in the low-doped regimes. Our work elucidates the roles of the microscopic scattering mechanisms that drive the hydrodynamic phenomena.

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Phys. Rev. B 114, L051405– Published 20 July, 2026
  • Received 15 December 2025
  • Revised 8 June 2026
  • Accepted 23 June 2026
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