3 papers
cond-mat.str-el2026
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…
cond-mat.mtrl-sci2025
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…
cond-mat.str-el2025
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…