Phase Diagram of Bilayer Electron‐Hole Plasmas

Schleede, Jens; Filinov, A.; Bönitz, M.; Fehske, Holger

doi:10.1002/ctpp.201200045

Cited by 38 publications

(32 citation statements)

References 37 publications

(126 reference statements)

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“…The paper by Schleede et al [6] considers theoretically the example of electron-hole bilayers that add quantum correlation effects to the Coulomb coupling. The paper by Schleede et al [6] considers theoretically the example of electron-hole bilayers that add quantum correlation effects to the Coulomb coupling.…”

Section: Strong Coupling Effects In Complex Plasmasmentioning

confidence: 99%

Recent Progress in Complex Plasmas

Meichsner

Bönitz

Piel

et al. 2012

Contrib. Plasma Phys.

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An overview on recent developments in the field of complex plasmas is presented. The focus is directed on the activities of research groups participating in the Collaborative Research Centre 24 “Fundamentals of Complex Plasmas” at the Universities in Greifswald and Kiel as well as at the Leibniz‐Institute for Plasma Research and Technology. This article summarizes results on strongly correlated dusty plasmas, reactive as well as electronegative plasmas and plasma‐surface interaction, and gives an introduction to the following articles of this special issue. Important developments are highlighted and future research directions are outlined (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Strong Coupling Effects In Complex Plasmasmentioning

confidence: 99%

Recent Progress in Complex Plasmas

Meichsner

Bönitz

Piel

et al. 2012

Contrib. Plasma Phys.

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“…The gas–liquid transition, features of the liquid exciton phase, and transition into the superfluid phase were studied as a function of the interlayer spacing ℓ in Lozovik and Berman . The Wigner crystallization and instability of the liquid in the electron–hole coupled systems were treated within the RPA and Monte Carlo numerical simulations in Swierkowski et al The phase diagram and the ordered structures in a bilayer electron–hole plasma were investigated using the path‐integral Monte Carlo approach in Schleede et al…”

Section: Introductionmentioning

confidence: 99%

“…The gas-liquid transition, features of the liquid exciton phase, and transition into the superfluid phase were studied as a function of the interlayer spacing in Lozovik and Berman. [3] The Wigner crystallization and instability of the liquid in the electron-hole coupled systems were treated within the RPA and Monte Carlo numerical simulations in Swierkowski et al [4,5] The phase diagram and the ordered structures in a bilayer electron-hole plasma were investigated using the path-integral Monte Carlo approach in Schleede et al [6,7] As shown by Keldysh, the multi-valley band structure facilitates the formation of the electron-hole liquid (EHL). According to Andrushin et al, [8] the multi-flavour EHP inherent in the bulk many-valley semiconductors has the unconventional Coulomb screening.…”

Section: Introductionmentioning

confidence: 99%

On the instability in the bilayer electron–hole plasma

Babichenko

Polishchuk

Tsyvkunova

2017

Contributions to Plasma Physics

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We consider here the multi‐flavour electron–hole plasma formed with the charges of opposite signs separated spatially in a bilayer. The temperature of the system is assumed to be smaller than the degenerate temperature of both the electrons and holes. It is found that, if the charge density is sufficiently small, the system has a negative compressibility, and the homogeneous in‐layer charge distribution is thermodynamically unstable. As a result, the system breaks down into 2 co‐existing phases, the denser one being an electron–hole liquid. New sound excitation branch, inherent in the multi‐flavour 2‐dimensional plasma, proves to be unstable exactly for the same density region in which the system is thermodynamically unstable. As the inter‐layer distance increases, the plasmon spectrum of the electron–hole liquid becomes softer for finite momenta. Once the dispersion curve for the plasmon spectrum crosses the momentum axis, the plasmon spectrum becomes unstable. As a result, the system experiences a quantum phase transition leading to the formation of a charge density wave.

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“…Experimentally, multifaceted attempts have been made to observe the condensed state of excitons, e.g., in photoexcited semiconductors [5][6][7][8][9], unconventional semiconductor/graphene systems [10][11][12][13][14], electrostatic traps [15], or neutral electron-ion quantum plasmas [16]. Theoretically, a possible crossover between a Bardeen-Cooper-Schrieffer (BCS) electron-hole pair condensate and a Bose-Einstein condensate (BEC) of preformed excitons has been of topical interest [4,[17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Excitonic BCS-BEC Crossover in Double-Layer Systems

Kaneko

Fehske²,

Ohta³

et al. 2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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We investigate electron-hole pair condensation in electron bilayers described by the square-lattice extended Falicov-Kimball model. Using exact diagonalization and variational cluster approximation techniques we first calculate the anomalous Green's function to clarify the character of the excitons in momentum space. We then evaluate the coherence length ξ (in unit of the lattice constant a) from the corresponding condensation amplitude and demonstrate the smooth crossover between a BCS state of weakly paired electrons and holes (ξ/a 1) and a BEC state of tightly bound excitons (ξ/a 1) as the Coulomb attraction increases. Overcoming the finite-size effects of exact diagonalization while still taking into account the essential correlation effects we show that the variational cluster approximation provides an advantageous description of exciton condensation in strongly correlated electron systems.

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Phase Diagram of Bilayer Electron‐Hole Plasmas

Cited by 38 publications

References 37 publications

Recent Progress in Complex Plasmas

Recent Progress in Complex Plasmas

On the instability in the bilayer electron–hole plasma

Excitonic BCS-BEC Crossover in Double-Layer Systems

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