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The electron-hole superfluidity in two coaxial nanotubes.

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We predict a superfluid phase and Coulomb drag in separated electron-hole systems within nanotubes. Drag resistance jumps at critical temperatures, indicating superfluid transitions and revealing kinks due to electron-hole asymmetry.

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Area of Science:

  • Condensed Matter Physics
  • Mesoscopic Physics
  • Quantum Phenomena

Background:

  • Spatiially separated electrons and holes in reduced dimensions can exhibit unique quantum phenomena.
  • Coulomb drag is a sensitive probe of electron-electron interactions and correlated states.

Purpose of the Study:

  • To predict the emergence of a superfluid phase in coaxial cylindrical nanotubes with spatially separated electrons and holes.
  • To investigate the Coulomb drag effect as a potential indicator of superfluid transitions.
  • To analyze the influence of electron-hole asymmetry on the system's thermodynamic properties.

Main Methods:

  • Theoretical modeling of interacting electrons and holes in a two-coaxial-nanotube system.
  • Analysis of pairing mechanisms leading to superfluidity.
  • Calculation of drag resistance as a function of temperature.
  • Investigation of the order parameter and free energy density.

Main Results:

  • Prediction of a superfluid phase driven by pairing in separated electron-hole systems.
  • Observation of a distinct jump in drag resistance at the critical temperature, signaling a superfluid transition.
  • Demonstration of kinks in the order parameter and free energy density at low temperatures due to tunable electron-hole asymmetry.

Conclusions:

  • The Coulomb drag effect serves as a viable experimental signature for detecting superfluid transitions in this system.
  • Electron-hole asymmetry, controlled by nanotube radii, significantly impacts the thermodynamic properties and the nature of the superfluid state.
  • The proposed system offers a novel platform for exploring correlated quantum phenomena in low-dimensional hybrid structures.