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Keyword: timereversal

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  • Physicists Create Time-Reversed Waves of Optical Light in Head-Spinning First

    12/16/2020 6:29:31 AM PST · by Red Badger · 16 replies
    https://www.sciencealert.com ^ | MICHELLE STARR | 16 DECEMBER 2020
    (The University of Queensland) =============================================================== Like watching a movie in reverse, physicists have just demonstrated a new technique for the time-reversal of a wave of optical light. That doesn't mean that they have actually reversed the flow of time; rather, they have found a way to induce an optical wave to retrace a forward path in reverse, returning to its point of origin. It's the first time that time reversal of optical waves has been achieved with full control over all of the degrees of freedom of light simultaneously. This would be a massive achievement in and of itself, but...
  • Superconductors with 'zeitgeist' – when materials differentiate between the past and the future

    05/18/2020 7:50:19 PM PDT · by BenLurkin · 10 replies
    Phys.org ^ | May 18, 2020 | Dresden University of Technology
    Physicists at TU Dresden have discovered spontaneous static magnetic fields with broken time-reversal symmetry in a class of iron-based superconductors. The past and the future of human life are not symmetric and therefore not reversible. In physics, this is different. The fundamental forces of nature in elementary particles, atoms and molecules are symmetric with respect to their development in time: Forwards or backwards makes no difference, scientists call this a time-reversal symmetry. However, for some years, physicists have been discovering new superconductors which brake time-reversal symmetry. To explain these observations, the basic mechanism of superconductivity, which has been known for...