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Quantum melting of a two-dimensional Wigner crystal

Institute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation

The paper reviews theoretical predictions for the behavior of two-dimensional low-density electron systems at near absolute zero temperatures, including the formation of an electron (Wigner) crystal, crystal melting at a critical electron density, and transitions between crystal modifications in more complex (for example, two-layer) systems. The paper presents experimental results obtained from real two-dimensional systems in which the non-conducting (solid) state of the electronic system with indications of collective localization is actually realized. Experimental methods for detecting a quantum liquid-solid phase interface are discussed.

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Keywords: two-dimensional electron system, Wigner crystal, electrons in semiconductors
PACS: 68.65.Pq, 71.10.Hf, 73.20.Qt (all)
DOI: 10.3367/UFNe.2017.01.038051
Citation: Dolgopolov V T "Quantum melting of a two-dimensional Wigner crystal" Phys. Usp. 60 731–742 (2017)
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Received: 26th, September 2016, revised: 20th, December 2016, 17th, January 2017

Оригинал: Долгополов В Т «Квантовое плавление двумерного вигнеровского кристалла» УФН 187 785–797 (2017); DOI: 10.3367/UFNr.2017.01.038051

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