4 papers
Twisting-operator approach to identifying gaplessness in SU() fermionic systems
Hao Cheng, Hang Su, Yuan Yao
We propose a general necessary condition for a spinful fermion chain with SU(2) spin-rotation symmetry to be gapped. Specifically, we prove that the expectation value of a properly…
Exact quantization of topological order parameter in SU() spin models, -ality transformation and ingappabilities
Hang Su, Yuan Yao, Akira Furusaki
We show that the ground-state expectation value of twisting operator is a topological order parameter for - and -symmetric symmetry-protected topologic…
Identification of gapless phases by a twisting operator
Hang Su, Tengzhou Zhang, Yuan Yao +1
We propose a general necessary condition for a spin chain with SO(3) spin-rotation symmetry to be gapped. Specifically, we prove that the ground state(s) of an SO(3)-symmetric gapp…
Photomagnetic-Chiral Anisotropy mediated by Chirality-Driven Asymmetric Spin Splitting
Tianwei Ouyang, Hang Su, Wanning Zhang +4
Photo-magnetic effects (PMEs), intrinsic to transition metals, arises from the interaction between light-induced angu-lar momentum and electronic spin. These effects are suppressed…