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Mixed-valence insulators with neutral Fermi surfaces.

Debanjan Chowdhury1, Inti Sodemann2,3, T Senthil2

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Samarium hexaboride (SmB6) may host a novel state of matter: a composite exciton Fermi liquid. This state features a three-dimensional Fermi surface composed of neutral fermions, potentially explaining observed properties in SmB6.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Samarium hexaboride (SmB6) is a well-known 3D mixed-valence system.
  • It transitions from a metallic phase at high temperatures to a paramagnetic insulator below 40 K.
  • Recent experiments suggest the insulating bulk may host neutral, gapless fermionic excitations.

Purpose of the Study:

  • To propose a theoretical ground state for strongly correlated mixed-valence insulators.
  • To identify the nature of the observed low-temperature excitations in SmB6.
  • To introduce the concept of a composite exciton Fermi liquid.

Main Methods:

  • Theoretical modeling of strongly correlated electron systems.
  • Derivation of the composite exciton formation mechanism.
  • Phenomenological description of composite exciton Fermi liquids.

Main Results:

  • A novel ground state, the composite exciton Fermi liquid, is identified.
  • This state features a 3D Fermi surface of neutral fermions termed 'composite excitons'.
  • A mechanism for composite exciton formation in mixed-valence insulators is described.

Conclusions:

  • The composite exciton Fermi liquid offers a potential explanation for experimental observations in SmB6.
  • This theoretical framework provides new insights into the physics of mixed-valence insulators.
  • Further experimental and theoretical work is needed to confirm the existence and properties of composite excitons.