Hang Su

activity

20232026

most citedIdentification of gapless phases by a twisting operator

2 citations · 4 across the 5 of their papers we have counts for

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3 papers · 1 filter

cond-mat.str-el2026

Twisting-operator approach to identifying gaplessness in SU( $N$ ) 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.str-el2025★ 2 cited

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…

cond-mat.str-el2024★ 1 cited

Exact quantization of topological order parameter in SU( $N$ ) spin models, $N$ -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 $U (1)$ - and $Z_{N}$ -symmetric symmetry-protected topologic…

Twisting-operator approach to identifying gaplessness in SU(N) fermionic systems

Identification of gapless phases by a twisting operator

Exact quantization of topological order parameter in SU(N) spin models, N-ality transformation and ingappabilities

Twisting-operator approach to identifying gaplessness in SU( $N$ ) fermionic systems

Exact quantization of topological order parameter in SU( $N$ ) spin models, $N$ -ality transformation and ingappabilities