The Folded Spin-1/2 XXZ Model: I. Diagonalisation, Jamming, and Ground State Properties

Understand

We study an effective Hamiltonian generating time evolution of states on intermediate time scales in the strong-coupling limit of the spin-1/2 XXZ model.

• To leading order, it describes an integrable model with local interactions.
• We solve it completely by means of a coordinate Bethe Ansatz that manifestly breaks the translational symmetry.
• We demonstrate the existence of exponentially many jammed states and estimate their stability under the leading correction to the effective Hamiltonian.