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    Raw Experimental Data for work presented in "Imaging collective behavior in an rf-SQUID metamaterial tuned by DC and RF magnetic fields"

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    README.txt (1Kb)
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    FIG_2_2D.dat (4.793Mb)
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    FIG_2_line.dat (103.3Kb)
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    FIG_3_a.dat (24.49Kb)
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    FIG_3_b.dat (1.035Mb)
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    FIG_3_c.dat (1.023Mb)
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    FIG_3_d.dat (1.029Mb)
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    FIG_3_e.dat (1.021Mb)
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    FIG_3_f.dat (3.739Mb)
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    FIG_4_a.dat (1.095Mb)
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    FIG_4_b.dat (1.097Mb)
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    FIG_4_c.dat (1.092Mb)
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    FIG_4_d.dat (1.093Mb)
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    FIG_4_e.dat (1.096Mb)
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    FIG_4_f.dat (1.091Mb)
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    Date
    2019
    Author
    Zhuravel, Alexander
    Bae, Seokjin
    Advisor
    Anlage, Steven
    DRUM DOI
    https://doi.org/10.13016/o7kj-hrzk
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    Abstract
    We examine the collective behavior of two-dimensional nonlinear superconducting metamaterials using a non-contact spatially resolved imaging technique. The metamaterial is made up of sub-wavelength nonlinear microwave oscillators in a strongly coupled 27x27 planar array of radio-frequency Superconducting QUantum Interference Devices (rf-SQUIDs). By using low temperature laser scanning microscopy we image microwave currents in the driven SQUIDs while in non-radiating dark modes and identify the clustering and uniformity of like-oscillating meta-atoms. We follow the rearrangement of coherent patterns due to meta-atom resonant frequency tuning as a function of external dc and rf magnetic flux bias. We find that the rf current distribution across the SQUID array at zero dc flux and small rf flux reveals a low degree of coherence. By contrast, the spatial coherence improves dramatically upon increasing of rf flux amplitude, in agreement with simulation. The paper can be accessed here: https://doi.org/10.1063/1.5064658
    Notes
    This is the raw data in Figs. 2, 3, and 4 of the main text of the paper.
    URI
    http://hdl.handle.net/1903/21732
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