English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study the quantum dynamics of interstitials and vacancies in atwo-dimensional Wigner crystal (WC) using a semi-classical instanton methodthat is asymptotically exact at low density, i.e., in the $r_s\to \infty$limit. The dynamics of these point defects mediates magnetism with much higherenergy scales than the exchange energies of the pure WC. Via exactdiagonalization of the derived effective Hamiltonians in the single-defectsectors, we find the dynamical corrections to the defect energies. Theresulting expression for the interstitial (vacancy) energy extrapolates to 0 at$r_s = r_{\rm mit} \approx 70$ ($r_s \approx 30$), suggestive of a self-dopinginstability to a partially melted WC for some range of $r_s$ below $r_{\rmmit}$. We thus propose a "metallic electron crystal'' phase of thetwo-dimensional electron gas at intermediate densities between a low densityinsulating WC and a high density Fermi fluid.

Dynamical defects in a two-dimensional Wigner crystal: self-doping and kinetic magnetism