138 citations · 184 across the 7 of their papers we have counts for
7 papers
Enumeration of spin-space groups: Towards a complete description of symmetries of magnetic orders
Yi Jiang, Ziyin Song, Tiannian Zhu +5
Symmetries of three-dimensional periodic scalar fields are described by 230 space groups (SGs). Symmetries of three-dimensional periodic (pseudo-) vector fields, however, are descr…
A Hamiltonian Approach for Obtaining Irreducible Projective Representations and the Perturbation for Anti-unitary Symmetry Groups
Zhen-Yuan Yang, Jian Yang, Chen Fang +1
As is known, the irreducible projective representations (Reps) of anti-unitary groups contain three different situations, namely, the real, the complex and quaternion types with to…
Symmetry-protected Nodal Points and Nodal Lines in Magnetic Materials
Jian Yang, Chen Fang, Zheng-Xin Liu
Nodal-point and Nodal-line structures in the dispersion of electron energy bands are characterized by their high degeneracy in certain corners or lines in the Brillouin zone (BZ).…
Unlocking of time reversal, space-time inversion and rotation invariants in magnetic materials
Jian Yang, Zheng-Xin Liu, Chen Fang
Time reversal () and space inversion are symmetries of our universe in the low-energy limit. Fundamental theorems relate their corresponding quantum numbers to the spin for elem…
Irreducible Projective Representations and Their Physical Applications
Jian Yang, Zheng-Xin Liu
An eigenfunction method is applied to reduce the regular projective representations (Reps) of finite groups to obtain their irreducible projective Reps. Anti-unitary groups are tre…
Connection dynamics of a gauge theory of gravity coupled with matter
Jian Yang, Kinjal Banerjee, Yongge Ma
We study the coupling of the gravitational action, which is a linear combination of the Hilbert-Palatini term and the quadratic torsion term, to the action of Dirac fermions. The s…
Hamiltonian Analysis of Action
Jian Yang, Kinjal Banerjee, Yongge Ma
We study a gravitational action which is a linear combination of the Hilbert-Palatini term and a term quadratic in torsion and possessing local Poincare invariance. Although this a…