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Dynamical enhancement of symmetries in many-body systems

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arxiv 1905.06389 v2 pith:H35V2TPX submitted 2019-05-15 cond-mat.stat-mech quant-ph

Kartiek Agarwal , Ivar Martin This is my paper · ORCID
classification cond-mat.stat-mechquant-ph
keywords symmetriesdynamicallocalmany-bodyquantumsystemsaccuratelyapproach
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We construct a dynamical decoupling protocol for accurately generating local and global symmetries in general many-body systems. Multiple commuting and non-commuting symmetries can be created by means of a self-similar-in-time ("polyfractal") drive. The result is an effective Floquet Hamiltonian that remains local and avoids heating over exponentially long times. This approach can be used to realize a wide variety of quantum models, and non-equilibrium quantum phases.

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  1. Floquet engineering of topological phases protected by emergent symmetries under resonant drives

    cond-mat.mes-hall 2019-08 conditional novelty 6.0 of 10

    A resonant drive induces an emergent Z2 symmetry in a Z2-symmetric Ising chain, yielding switchable Z2 x Z2 symmetry-protected topological phases detectable by period-doubled order parameters.

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