Critical Excitation Spectrum of Quantum Chain With A Local 3-Spin Coupling

Abstract

This article reports a measurement of the low-energy excitation spectrum along the critical line for a quantum spin chain having a local interaction between three Ising spins and longitudinal and transverse magnetic fields. The measured excitation spectrum agrees with that predicted by the (D${}_4$, A${}_4$) conformal minimal model under a nontrivial correspondence between translations at the critical line and discrete lattice translations. Under this correspondence, the measurements confirm a prediction that the critical line of this quantum spin chain and the critical point of the 2D 3-state Potts model are in the same universality class.

7 pages, 2 figures

References in corpus (2)

• Three-spin interactions in optical lattices and criticality in cluster Hamiltonians
• Chiral phase from three spin interactions in an optical lattice

Cited by in corpus (1)

• Critical behavior of a quantum chain with four-spin interactions in the presence of longitudinal and transverse magnetic fields