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Relaxation electrodynamics of superinsulators.

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Superinsulators exhibit charge confinement via electric strings, analogous to quarks. This study reveals relaxation dynamics and critical exponents, providing evidence for linear potential and ruling out disorder-induced localization in quantum materials.

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Area of Science:

  • Quantum Materials Science
  • Strong Interaction Physics
  • Condensed Matter Physics

Background:

  • Superinsulators are quantum materials exhibiting phenomena analogous to strong interactions, such as confinement and asymptotic freedom.
  • They are considered mirror-twins of superconductors, with reversed electric and magnetic field effects.
  • Cooper pairs and Cooper holes in superinsulators form neutral electric pions confined by electric strings.

Purpose of the Study:

  • To investigate the non-equilibrium relaxation dynamics of electric pions in superinsulating films.
  • To experimentally determine the relationship between current passage time delay and applied voltage.
  • To provide evidence for electric string confinement and explore memory effects in superinsulators.

Main Methods:

  • Experimental measurement of current passage time delay in superinsulating films under varying applied voltages.
  • Analysis of power-law relationships and critical exponents governing transitions between different superinsulating states.
  • Investigation of dynamic critical exponents associated with memory effects upon voltage reversal.

Main Results:

  • A power-law relationship was found between current passage time delay and applied voltage, characterized by an effective threshold voltage.
  • Two distinct critical exponents were identified, corresponding to transitions from the electric Meissner state to the mixed state and to the resistive state.
  • The determined exponent provides direct experimental evidence for the linear potential of electric strings confining charges and refutes disorder-induced localization.

Conclusions:

  • The study experimentally confirms charge confinement via electric strings in superinsulators, analogous to quark confinement in quantum chromodynamics.
  • The findings provide strong evidence against disorder-induced localization as the mechanism for superinsulation.
  • The observed memory effects and relaxation dynamics open new avenues for studying fundamental strong interaction phenomena using accessible experimental setups.