Distortional weak-coupling instability of Bogoliubov Fermi surfaces

@article{Timm2020DistortionalWI,
  title={Distortional weak-coupling instability of Bogoliubov Fermi surfaces},
  author={Carsten Timm and P. M. R. Brydon and Daniel Agterberg},
  journal={Physical Review B},
  year={2020},
  volume={103},
  pages={024521}
}
Centrosymmetric multiband superconductors which break time-reversal symmetry generically have two-dimensional nodes, i.e., Fermi surfaces of Bogoliubov quasiparticles. We show that the coupling of the electrons to the lattice always leads to a weak-coupling instability of such a state toward spontaneous breaking of inversion symmetry at low temperatures. This instability is driven by a Cooper logarithm in the internal energy but the order parameter is not superconducting but distortional. We… 

Many-body selection rule for quasiparticle pair creations in centrosymmetric superconductors

When metal becomes superconducting, new optical excitation channels are created by particle-hole mixing. These excitation channels contribute negligibly to optical responses in most superconductors,

Symmetry, nodal structure, and Bogoliubov Fermi surfaces for nonlocal pairing

Multiband effects can lead to fundamentally different electronic behavior of solids, as exemplified by the possible emergence of Fermi surfaces of Bogoliubov quasiparticles in centrosymmetric

Bogoliubov-Fermi surface with inversion symmetry and electron-electron interactions: Relativistic analogies and lattice theory

We show that the general low-energy Bogoliubov-de-Genness Hamiltonian in a multiband superconductor with broken time reversal and preserved inversion symmetry is a generator of real four-dimensional

References

SHOWING 1-10 OF 65 REFERENCES

Experimental consequences of Bogoliubov Fermi surfaces

Superconductors involving electrons with internal degrees of freedom beyond spin can have internally anisotropic pairing states that are impossible in single-band superconductors. As a case in point,

Bogoliubov Fermi surfaces stabilized by spin-orbit coupling

It was recently understood that centrosymmetric multiband superconductors that break time-reversal symmetry generically show Fermi surfaces of Bogoliubov quasiparticles. We investigate the

Topological ultranodal pair states in iron-based superconductors

It is shown that multiband superconductors with dominant spin singlet, intraband pairing of spin-1/2 electrons can undergo a transition to a state with Bogoliubov Fermi surfaces if spin-orbit coupling, interband pairing and time reversal symmetry breaking are also present.

Superconductivity in three-dimensional spin-orbit coupled semimetals

Motivated by the experimental detection of superconductivity in the low-carrier density half-Heusler compound YPtBi, we study the pairing instabilities of three-dimensional strongly spin-orbit

Superconductivity and spin–orbit coupling in non-centrosymmetric materials: a review

The effects of ASOC on the superconducting properties and the extent to which there is evidence for singlet-triplet mixing are evaluated and a conceptual overview of the key theoretical results are given.

Bogoliubov Fermi Surfaces in Superconductors with Broken Time-Reversal Symmetry.

It is shown that, for an even-parity nodal superconducting state which spontaneously breaks time-reversal symmetry, the low-energy excitation spectrum generally does not belong to any of these categories and has extended Bogoliubov Fermi surfaces, which are topologically protected from being gapped by a Z_{2} invariant.

Instability of j=32 Bogoliubov Fermi surfaces

Exotic quantum phases including topological states and non-Fermi liquids may be realized by quantum states with total angular momentum $j=3/2$, as manifested in HgTe and pyrochlore iridates.

d -wave superconductivity and Bogoliubov-Fermi surfaces in Rarita-Schwinger-Weyl semimetals

Quasiparticles appearing in Dirac or Weyl semimetals connect relativistic physics at high energies to ongoing studies of novel condensed matter states. Recently, the standard model of emergent

Field induced magnetic ordering transition in Kondo insulators

Abstract.We study the 2D Kondo insulators in a uniform magnetic field using quantum Monte Carlo simulations of the particle-hole symmetric Kondo lattice model and a mean field analysis of the

Concealed d-wave pairs in the s± condensate of iron-based superconductors

A new class of s± state containing a condensate of d-wave Cooper pairs, concealed by their entanglement with the iron orbitals is proposed, which allows us to understand the development of octet nodes in potassium-doped Ba1−x KXFe2As2 as a reconfiguration of the orbital and internal angular momentum into a high spin state.
...