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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity Theory

Background:

  • Superconducting condensates with broken time reversal symmetry and lacking inversion symmetry are theoretically interesting.
  • Bogoliubov quasiparticles describe excitations in superconductors.

Purpose of the Study:

  • To investigate the emergence and stability of Bogoliubov-Fermi surfaces in such systems.
  • To explore the conditions under which these surfaces may disappear.

Main Methods:

  • Computation of the effective Hamiltonian near the normal Fermi surface.
  • Integration over high-energy states to derive low-energy properties.

Main Results:

  • Mini-Bogoliubov-Fermi (BF) surfaces generically appear for small superconducting order parameters.
  • Absence of inversion symmetry renders BF surfaces stable against weak perturbations.
  • BF surfaces can vanish through a Lifshitz transition with increasing order parameter, leading to a fully gapped spectrum.

Conclusions:

  • The study demonstrates the generic existence of BF surfaces in specific superconducting systems.
  • The findings highlight the role of symmetry and the superconducting order parameter in shaping quasiparticle spectra.
  • Potential experimental consequences and exceptions are noted.