Online

July 24 (Fri), 2020 / 9:00 AM (KST)

Nonequilibrium properties of quantum materials present many intriguing properties, among them athermal behavior, which violates the eigenstate thermalization hypothesis. Such behavior has primarily been observed in disordered systems. More recently, experimental and theoretical evidence for athermal eigenstates, known as "quantum scars," has emerged in nonintegrable disorder-free models in one dimensions with constrained dynamics. We show the existence of quantum scar eigenstates and investigate their dynamical properties in many simple two-body Hamiltonians with "staggered" interactions, involving ferromagnetic and antiferromagnetic motifs, in arbitrary dimensions. These magnetic models include simple modifications of widely studied ones (e.g., the XXZ model) on a variety of frustrated and unfrustrated lattices. We domonstrate our ideas by focusing on the two-dimensional frustrated spin-1/2 kagome aintiferromagnet, which was previously shown to harbor a special exactly solvable point with "three-colors-we show the presence of robust quantum revivals, which survive the addition of anisotropic terms. 

Kyungmin Lee (National High Magnetic Field Lab)

Gil Young Cho (POSTECH)