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Transport evidence for a sliding two-dimensional quantum electron solid.

Pedro Brussarski1, S Li2, S V Kravchenko3,4

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|September 20, 2018
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Researchers observed unique electrical behavior in two-dimensional electron systems, suggesting a quantum electron solid, not previously confirmed. This finding offers new insights into the metal-insulator transition in low-disorder systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • The behavior of low-disorder two-dimensional (2D) electron systems is crucial for understanding the metal-insulator transition.
  • Despite extensive research, definitive evidence for electron crystallization into a quantum Wigner crystal in the strongly interacting limit remains elusive.

Purpose of the Study:

  • To investigate the insulating state of a 2D electron system in silicon.
  • To identify the underlying mechanism responsible for the observed electrical characteristics.

Main Methods:

  • Experimental study of a 2D electron system in silicon.
  • Analysis of voltage-current characteristics and noise measurements.
  • Comparison with theoretical models, including those for vortex lattice depinning in superconductors.

Main Results:

  • Observed two-threshold voltage-current characteristics in the insulating state.
  • Detected a significant increase in noise between these two thresholds.
  • Found that existing traditional models could not explain the results.

Conclusions:

  • The experimental results closely resemble the collective depinning of vortex lattices in type-II superconductors.
  • Adapting the vortex depinning model to an electron solid provided a good fit to the data.
  • These findings strongly support the existence of a quantum electron solid as the cause of the low-density insulating state.