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arXiv · 1012.4159

Quantum damping of Fermi-Pasta-Ulam revivals in ultracold Bose gases

Ippei Danshita·Rafael Hipolito·Vadim Oganesyan·Anatoli Polkovnikov
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Abstract

We propose an experimental scheme for studying the Fermi-Pasta-Ulam (FPU) phenomenon in a quantum mechanical regime using ultracold atoms. Specifically, we suggest and analyze a setup of one-dimensional Bose gases confined into an optical lattice. The strength of quantum fluctuations is controlled by tuning the number of atoms per lattice sites (filling factor). By simulating the real-time dynamics of the Bose-Hubbard model by means of the exact numerical method of time-evolving block decimation, we investigate the effects of quantum fluctuations on the FPU recurrence and show that strong quantum fluctuations cause significant damping of the FPU oscillation.

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Ippei Danshita, Rafael Hipolito, Vadim Oganesyan, Anatoli Polkovnikov. 2010-12-19. Quantum damping of Fermi-Pasta-Ulam revivals in ultracold Bose gases. https://doi.org/10.1093/ptep/ptu041

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