TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.17.6.161
TI  - Pairing symmetry and fermion projective symmetry groups
PY  - 2024/12/10
UR  - https://scipost.org/SciPostPhys.17.6.161
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 17
IS  - 6
SP  - 161
A1  - Yang, Xu
AU  - Biswas, Sayak
AU  - Lu, Shuangyuan
AU  - Randeria, Mohit
AU  - Lu, Yuan-Ming
AB  - The Ginzburg-Landau (GL) theory is very successful in describing the pairing symmetry, a fundamental characterization of the broken symmetries in a paired superfluid or superconductor. However, GL theory does not describe fermionic excitations such as Bogoliubov quasiparticles or Andreev bound states that are directly related to topological properties of the superconductor. In this work, we show that the symmetries of the fermionic excitations are captured by a Projective Symmetry Group (PSG), which is a group extension of the bosonic symmetry group in the superconducting state. We further establish a correspondence between the pairing symmetry and the fermion PSG. When the normal and superconducting states share the same spin rotational symmetry, there is a simpler correspondence between the pairing symmetry and the fermion PSG, which we enumerate for all 32 crystalline point groups. We also discuss the general framework for computing PSGs when the spin rotational symmetry is spontaneously broken in the superconducting state. This PSG formalism leads to experimental consequences, and as an example, we show how a given pairing symmetry dictates the classification of topological superconductivity.
ER  -

@Article{10.21468/SciPostPhys.17.6.161,
	title={{Pairing symmetry and fermion projective symmetry groups}},
	author={Xu Yang and Sayak Biswas and Shuangyuan Lu and Mohit Randeria and Yuan-Ming Lu},
	journal={SciPost Phys.},
	volume={17},
	pages={161},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.17.6.161},
	url={https://scipost.org/10.21468/SciPostPhys.17.6.161},
}