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2015 ; 5
(ä): 14604
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Stroboscopic phenomena in superconductors with dynamic pinning landscape
#MMPMID26423610
Jeli? ?L
; Milo?evi? MV
; Van de Vondel J
; Silhanek AV
Sci Rep
2015[Oct]; 5
(ä): 14604
PMID26423610
show ga
Introducing artificial pinning centers is a well established strategy to trap
quantum vortices and increase the maximal magnetic field and applied electric
current that a superconductor can sustain without dissipation. In case of
spatially periodic pinning, a clear enhancement of the superconducting critical
current arises when commensurability between the vortex configurations and the
pinning landscape occurs. With recent achievements in (ultrafast) optics and
nanoengineered plasmonics it has become possible to exploit the interaction of
light with superconductivity, and create not only spatially periodic imprints on
the superconducting condensate, but also temporally periodic ones. Here we show
that in the latter case, temporal matching phenomena develop, caused by
stroboscopic commensurability between the characteristic frequency of the vortex
motion under applied current and the frequency of the dynamic pinning. The
matching resonances persist in a broad parameter space, including magnetic field,
driving current, or material purity, giving rise to unusual features such as
externally variable resistance/impedance and Shapiro steps in current-voltage
characteristics. All features are tunable by the frequency of the dynamic pinning
landscape. These findings open further exploration avenues for using flashing,
spatially engineered, and/or mobile excitations on superconductors, permitting us
to achieve advanced functionalities.