Finite-temperature Wigner solid and other phases of ripplonic polarons on a helium film

Serghei N. Klimin, Jacques Tempere (), Vyacheslav R. Misko () and Michiel Wouters
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Serghei N. Klimin: TQC, Universiteit Antwerpen
Jacques Tempere: TQC, Universiteit Antwerpen
Vyacheslav R. Misko: TQC, Universiteit Antwerpen
Michiel Wouters: TQC, Universiteit Antwerpen

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 8, 1-11

Abstract: Abstract Electrons on liquid helium can form different phases depending on density, and temperature. Also the electron-ripplon coupling strength influences the phase diagram, through the formation of so-called “ripplonic polarons”, that change how electrons are localized, and that shifts the transition between the Wigner solid and the liquid phase. We use an all-coupling, finite-temperature variational method to study the formation of a ripplopolaron Wigner solid on a liquid helium film for different regimes of the electron-ripplon coupling strength. In addition to the three known phases of the ripplopolaron system (electron Wigner solid, polaron Wigner solid, and electron fluid), we define and identify a fourth distinct phase, the ripplopolaron liquid. We analyse the transitions between these four phases and calculate the corresponding phase diagrams. This reveals a reentrant melting of the electron solid as a function of temperature. The calculated regions of existence of the Wigner solid are in agreement with recent experimental data.

Keywords: Statistical; and; Nonlinear; Physics (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1140/epjb/e2016-70149-8

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