Manybody localization: Local integrals of motion, arealaw entanglement, and quantum dynamics Speaker(s): Dmitry Abanin
Abstract: We demonstrate that the manybody localized phase is characterized by the existence of infinitely many local conservation laws. We argue that manybody eigenstates can be obtained from product states by a sequence of nearly local unitary transformation, and therefore have an arealaw entanglement entropy, typical of ground states. Using this property, we construct the local integrals of motion in terms of projectors onto certain linear combinations of eigenstates [1]. The local integrals of motion can be viewed as effective quantum bits which have a conserved zcomponent that cannot decay. Thus, the dynamics is reduced to slow dephasing between distant effective bits. For initial product states, this leads to a characteristic slow powerlaw decay of local observables, which is measurable experimentally, as well as to logarithmic in time growth of entanglement entropy [2,3]. We support our findings by numerical simulations of randomfield XXZ spin chains. Our work shows that the manybody localized phase is locally integrable, reveals a simple entanglement structure of eigenstates, and establishes the laws of dynamics in this phase.
[1] M. Serbyn, Z. Papic, D. A. Abanin, Phys. Rev. Lett. 111, 127201 (2013). [2] Jens H. Bardarson, Frank Pollmann, and Joel E. Moore, Phys. Rev. Lett. 109, 017202 (2012). [3] M. Serbyn, Z. Papic, D. A. Abanin, Phys. Rev. Lett. 110, 260601 (2013) Date: 12/02/2014  9:45 am
Collection: Emergence in Complex Systems
