SAMOP 2021 – scientific programme

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QI: Fachverband Quanteninformation

QI 8: Quantum Information: Poster (joint session QI/Q)

QI 8.24: Poster

Wednesday, September 22, 2021, 16:30–18:30, P

Characteristic dynamics of the bosonic quantum east model — •Andreas Geißler and Juan Garrahan — School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK

Kinetically constrained models like the East model are among the simplest systems to give insight into the dynamics of glass formers. In these models local spin flips are only possible if neighboring spins satisfy a condition, for example in the East model if the neighbor to the left points up. Here, we consider a bosonic quantum version of the East model using the Holstein-Primakoff-transformation. A comparison of exact diagonalzation and the flucuation operator expansion reveals a ground state phase diagram reminiscent of the spin half case. Using a Gross-Pitaevskii like limit for large spin we are able to perform dynamics for large system sizes. These reveal different dynamical regimes. We use open boundary conditions with the first site fixed to any non-zero occupation. We then observe two types of chaotic behavior in the active regime, depending on the energy of the local generator, and nontrivial localization dynamics in the inactive regime.

[1] M.C. Banuls et al., PRL, 123, 200601 (2019)