Speaker
Description
We discuss the angular-time evolution ---a parameter-time evolution generated by the entanglement Hamiltonian--- for the bipartitioned ground state of the S=1 bilinear–biquadratic chain under open boundary conditions. For the exactly sobvable AKLT chain, we first demonstrate the relationship between the angular-time evolution and edge-spin dynamics in a uniform magnetic field applied to the system part, using a gauge transformation of the matrix-product state. We then calculate angular-time spin correlation functions for the S=1 Heisenberg chain and extract the dominant oscillation mode originating from twofold-degenerate entanglement spectrum protected by the Z2×Z2 symmetry. Finally, we verify the correspondence between the edge-spin dynamics in a uniform magnetic field and this dominant angular-time mode, which may provide a new route to access the SPT entanglement of the Haldane phase through the observable edge-spin dynamics.