Bielectron vortices in two-dimensional Dirac semimetals

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Mechanics

Background:

• Emerging materials and low-dimensional systems are key areas for discovering new states of matter and quasiparticles.
• Dirac materials, hosting Dirac-like quasi-particles, are of significant fundamental and applied interest.

Purpose of the Study:

• To investigate the formation of bound states between two-dimensional massless Dirac-Weyl fermions.
• To identify novel quasiparticles and their potential implications in condensed matter physics.

Main Methods:

• Theoretical analysis of two-dimensional massless Dirac-Weyl fermions.
• Investigating bound state formation dependent on inter-particle potential decay rate.

Main Results:

• A bound state of two Dirac-Weyl fermions, termed bielectron vortices, can form regardless of interaction potential sign.
• These bielectron vortices are double-charged, zero-energy bosonic quasi-particles.
• The bosonic nature allows for condensation and potential Majorana physics without superconductivity.

Conclusions:

• Bielectron vortices represent a new type of energetically favorable quasi-particle.
• These findings may explain unexplained experimental observations in gated graphene.
• The discovery opens avenues for exploring novel quantum phenomena and material properties.