"Shaken, not Stirred"

Discussion in 'General Science & Technology' started by paddoboy, Feb 10, 2017.

  1. paddoboy Valued Senior Member

    Physicists realize exotic quantum system robust to mixing by periodic forces
    February 2, 2017
    A team of researchers led by LMU physics professor Immanuel Bloch has experimentally realized an exotic quantum system which is robust to mixing by periodic forces.

    When James Bond asks the barkeeper for a Martini ("shaken, not stirred"), he takes it for granted that the ingredients of the drink are miscible. If he were to place the order in a bar in the quantum realm, however, Agent 007 might be in for a surprise! For a research team led by physicists Pranjal Bordia, Professor Immanuel Bloch (LMU and Max-Planck-Institute for Quantum Optics) and Professor Michael Knap (TU Munich, Physics Department and Institute for Advanced Study) has now prepared a form of quantum matter that is robust to shaking – a property that would make life difficult for cocktail lovers.

    Read more at: https://phys.org/news/2017-02-physicists-exotic-quantum-robust-periodic.html#jCp
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  3. paddoboy Valued Senior Member


    Periodically driving a many-body localized quantum system

    Periodically driven quantum many-body systems can display rich dynamics and host exotic phases that are absent in their undriven counterparts. However, in the presence of interactions such systems are expected to eventually heat up to a simple infinite-temperature state. One possible exception is a periodically driven many-body localized system, in which heating is precluded by strong disorder. Here, we use a gas of ultracold fermionic potassium atoms in optical lattices to prepare and probe such a driven system and show that it is indeed stable for high enough driving frequency. Moreover, we find a novel regime in which the system is exceedingly stable even at low drive frequencies, a particular feature of our driving scheme. Our experimental findings are well supported by numerical simulations and may provide avenues for engineering novel phases in periodically driven matter.

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