Strong and almost strong modes of Floquet spin chains in Krylov subspaces

Abstract

Integrable Floquet spin chains are known to host strong zero and $\pi$ modes which are boundary operators that respectively commute and anticommute with the Floquet unitary generating stroboscopic time-evolution, in addition to anticommuting with a discrete symmetry of the Floquet unitary. Thus the existence of strong modes imply a characteristic pairing structure of the full spectrum. Weak interactions modify the strong modes to almost strong modes that almost commute or anticommute with the Floquet unitary. Manifestations of strong and almost strong modes are presented in two different Krylov subspaces. One is a Krylov subspace obtained from a Lanczos iteration that maps the time-evolution generated by the Floquet Hamiltonian onto dynamics of a single particle on a fictitious chain with nearest neighbor hopping. The second is a Krylov subspace obtained from the Arnoldi iteration that maps the time-evolution generated directly by the Floquet unitary onto dynamics of a single particle on a fictitious chain with longer range hopping. While the former Krylov subspace is sensitive to the branch of the logarithm of the Floquet unitary, the latter obtained from the Arnoldi scheme is not. The effective single particle models in the Krylov subspace are discussed, and the topological properties of the Krylov chain that ensure stable $0$ and $\pi$ modes at the boundaries are highlighted. The role of interactions is discussed. Expressions for the lifetime of the almost strong modes are derived in terms of the parameters of the Krylov subspace, and are compared with exact diagonalization.

References in corpus (11)

• Non-Abelian Anyons and Topological Quantum Computation
• Chiral symmetry and bulk--boundary correspondence in periodically driven one-dimensional systems
• Toda chain flow in Krylov space
• A Brief History of Time Crystals
• Large Classes of Quantum Scarred Hamiltonians from Matrix Product States
• Euclidean operator growth and quantum chaos
• Nonequilibrium Quantum Phase Transitions in the Ising Model
• Lifetime of almost strong edge-mode operators in one dimensional, interacting, symmetry protected topological phases
• Dynamics of almost strong edge modes in spin chains away from integrability
• Symmetry enhanced boundary qubits at infinite temperature
• Coexistence of Strong and Weak Majorana Zero Modes in Anisotropic XY Spin Chain with Second-Neighbor Interaction