Strongly correlated two-dimensional plasma explored from entropy measurements
Rattachement africain : ru, us. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Charged plasma and Fermi liquid are two distinct states of electronic matter intrinsic to dilute two-dimensional electron systems at elevated and low temperatures, respectively. Probing their thermodynamics represents challenge because of lack of an adequate technique. Here, we report a thermodynamic method to measure the entropy per electron in gated structures. Our technique appears to be three orders of magnitude superior in sensitivity to a.c. calorimetry, allowing entropy measurements with only 108 electrons. This enables us to investigate the correlated plasma regime, previously inaccessible experimentally in two-dimensional electron systems in semiconductors. In experiments with clean two-dimensional electron system in silicon-based structures, we traced entropy evolution from the plasma to Fermi liquid regime by varying electron density. We reveal that the correlated plasma regime can be mapped onto the ordinary non-degenerate Fermi gas with an interaction-enhanced temperature-dependent effective mass. Our method opens up new horizons in studies of low-dimensional electron systems. Electrons trapped to a two-dimensional plane can exhibit many exotic properties. Here, the authors use a technique that measures entropy per electron to explore the evolution of such a system from the Fermi liquid regime to a previously unexplored regime of a strongly correlated charged plasma.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Strongly correlated two-dimensional plasma explored from entropy measurements
- Date Crossref
- 23/06/2015
- Éditeur
- Springer Science and Business Media LLC
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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P.N. Lebedev Physical Institute of the Russian Academy of Sciences pays non établi dans la noticeStructure de recherche
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Moscow Institute of Physics and Technology Moscow 119991 pays non établi dans la noticeUniversité ou école supérieure
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Pennsylvania State University Department of Physics pays non établi dans la noticeUniversité ou école supérieure
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Landau Institute for Theoretical Physics Moscow 141700 pays non établi dans la noticeStructure de recherche
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Lebedev Physical Institute of the RAS pays non établi dans la noticeStructure de recherche
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991 — Moscow Institute of Physics and Technology et Department of Physics — Pennsylvania State University, avec 2 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.