Publication: Cat states in a driven superfluid: role of signal shape and switching protocol
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2021-04-14
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Springer Heidelberg
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Abstract
We investigate the behavior of a one-dimensional Bose-Hubbard model whose kinetic energy is made to oscillate with zero time-average. The effective dynamics is governed by an atypical many-body Hamiltonian where only even-order hopping processes are allowed. At a critical value of the driving, the system passes from a Mott insulator to a superfluid formed by a cat-like superposition of two quasi-condensates with opposite non-zero momenta. We analyze the robustness of this unconventional ground state against variations of a number of system parameters. In particular we study the effect of the waveform and the switching protocol of the driving signal. Knowledge of the sensitivity of the system to these parameter variations allows us to gauge the robustness of the exotic physical behavior.
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©2021 Springer Heilderberg
This work was supported by Spain's MINECO through Grant FIS2017-84368-P, and by the UCM through Grant FEI-EU-19-12.