Publications by authors named "Peter Barmettler"
We study the dynamics of a strongly interacting bosonic quantum gas in an optical lattice potential under the effect of a dissipative environment. We show that the interplay between the dissipative process and the Hamiltonian evolution leads to an unconventional dynamical behavior of local number fluctuations. In particular, we show, both analytically and numerically, the emergence of an anomalous diffusive evolution in configuration space at short times and, at long times, an unconventional dynamics dominated by rare events.
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- In relativistic quantum field theory, information is limited to the speed of light, whereas in non-relativistic systems, information can propagate faster, although real systems often show finite propagation speeds due to short-range interactions.
- Previous studies have established the Lieb-Robinson bound, indicating a maximal velocity for spreading correlations in many-body systems, creating an effective light cone that restricts how fast these correlations can propagate.
- This research presents experimental evidence of propagating correlations in a one-dimensional quantum gas, demonstrating that quasiparticle pairs can transport correlations with a finite velocity, which has significant implications for understanding quantum systems and improving quantum computing techniques.
We study the unitary time evolution of antiferromagnetic order in anisotropic Heisenberg chains that are initially prepared in a pure quantum state far from equilibrium. Our analysis indicates that the antiferromagnetic order imprinted in the initial state vanishes exponentially. Depending on the anisotropy parameter, oscillatory or nonoscillatory relaxation dynamics is observed.
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