Critical filling factor for the formation of a quantum Wigner crystal screened by a nearby layer

H. Deng, L. W. Engel, L. N. Pfeiffer, K. W. West, K. W. Baldwin, M. Shayegan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

One of the most fascinating ground states of an interacting electron system is the so-called Wigner crystal where the electrons, in order to minimize their repulsive Coulomb energy, form an ordered array. Here, we report measurements of the critical filling factor (νC) below which a magnetic-field-induced, quantum Wigner crystal forms in a dilute, two-dimensional electron layer when a second, high-density electron layer is present in close proximity. The data reveal that the Wigner crystal forms at a significantly smaller νC compared to the νC (≃0.20) in single-layer two-dimensional electron systems. The measured νC exhibits a strong dependence on the interlayer distance, reflecting the interaction and screening from the adjacent, high-density layer.

Original languageEnglish (US)
Article number081111
JournalPhysical Review B
Volume98
Issue number8
DOIs
StatePublished - Aug 16 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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