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Weyl Mott Insulator.

Takahiro Morimoto1, Naoto Nagaosa1,2

  • 1RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.

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PubMed
Summary
This summary is machine-generated.

We introduce the Weyl Mott insulator (WMI), a novel topological material where electron interactions create Mott gaps around Weyl fermions. This discovery opens new avenues for topological materials research.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Relativistic Weyl fermions (WF) are topological quasiparticles in magnetic materials, acting as sources/sinks of Berry curvature.
  • WFs are generally stable due to topological indices, annihilating only in pairs of opposite chirality.

Purpose of the Study:

  • To theoretically investigate the impact of electron-electron interactions on Weyl fermions.
  • To introduce and characterize a novel topological phase: the Weyl Mott insulator (WMI).

Main Methods:

  • Theoretical modeling of a system incorporating electron-electron interactions.
  • Analysis of band structure and topological properties.

Main Results:

  • A Mott gap opens for each Weyl fermion without violating topological stability, creating the Weyl Mott insulator (WMI).
  • The WMI exhibits energy gaps in ARPES and optical conductivity, non-zero Hall conductance, and surface Fermi arcs.
  • The penetration depth of surface Fermi arcs diverges at projected Weyl point momenta.

Conclusions:

  • The study establishes the existence of the Weyl Mott insulator, a new class of topological materials.
  • Novel features of WMIs offer potential for experimental detection and applications.
  • The findings suggest pyrochlore iridates as potential candidates for realizing WMIs.