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Frustrated phase separation in two-dimensional charged systems (Articolo in rivista)

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Label

Frustrated phase separation in two-dimensional charged systems (Articolo in rivista) (literal)

Anno

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Alternative label

Ortix, C (1); Lorenzana, J (2,3); Di Castro, C (2,3) (2006)
Frustrated phase separation in two-dimensional charged systems
in Physical review. B, Condensed matter and materials physics (CD-ROM); The American Physical Society, Ridge, NY (Stati Uniti d'America)
(literal)

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Note

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1) Dipartimento di Fisica, Università di Lecce and INFN Sezione di Lecce, Via per Arnesano, 73100 Lecce, Italy 2) SMC-Istituto Nazionale di Fisica della Materia and Dipartimento di Fisica, Università di Roma \"La Sapienza,\" Piazzale Aldo Moro 2, 1-00185 Roma, Italy 3) ISC-Consiglio Nazionale delle Ricerche, Via dei Taurini 19, 00185 Roma, Italy (literal)

Titolo

Abstract

We study phase-separation frustrated (FPS) by the long-range Coulomb interaction in two-dimensional electronic systems with emphasis to the case of a metallic and an insulating phase. In the mixed phase, the system self-organizes in terms of mesoscopic inhomogeneities of one phase hosted by the other phase. We analyze the cases of circular drops and alternating stripes. As a first approximation, we consider the density inside each inhomogeneity as constant and in some cases, we test the accuracy of this assumption by a more involved local density approximation. We find that the transition from the uniform phase to the frustrated phase-separated phase changes order depending upon its geometric arrangement. Contrary to what was found in three-dimensional systems, there is no upper bound for the size of inhomogeneities. This difference stands on the different role of the long-range Coulomb interaction and screening in two- and three-dimensional systems. We conclude that two-dimensional systems are more prone to mesoscopic FPS. (literal)

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