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Excitonic Insulators and Superfluidity in Two-Dimensional Bilayers without External Fields.

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This summary is machine-generated.

We introduce van der Waals (vdW) Janus bilayers as intrinsic excitonic insulators. These novel materials exhibit insulating ground states and superfluid properties, paving the way for new excitonic phases.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum mechanics

Background:

  • Excitonic insulators are quantum states of matter with unique electronic properties.
  • Previous research achieved excitonic insulating regimes using external gates in type II heterobilayers.
  • Janus materials offer a novel platform for intrinsic excitonic insulator realization.

Purpose of the Study:

  • To explore van der Waals (vdW) Janus bilayers as a new platform for intrinsic excitonic insulators.
  • To identify specific vdW Janus bilayers exhibiting insulating ground states and superfluid properties.
  • To understand the underlying physics governing the excitonic properties of these bilayers.

Main Methods:

  • Ab initio calculations to determine quasiparticle band structures.
  • Calculation of screened Coulomb interaction and interlayer exciton binding energies.
  • Construction and solution of a BCS-like Hamiltonian for the exciton condensate using mean-field theory.

Main Results:

  • Identification of 16 vdW Janus bilayers with intrinsic excitonic insulating ground states.
  • Demonstration of superfluid properties in these identified bilayers.
  • Analysis of the interplay between interlayer hybridization, spin-orbit coupling, and dielectric screening.

Conclusions:

  • vdW Janus bilayers represent a promising new class of materials for realizing intrinsic excitonic insulators.
  • These materials are candidates for exhibiting novel excitonic phases at low temperatures.
  • The study highlights the critical role of fundamental interactions in dictating excitonic insulator properties.