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首页> 外文期刊>Physica, B. Condensed Matter >Exciton and charge density wave formation in spatially separated electron-hole liquids
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Exciton and charge density wave formation in spatially separated electron-hole liquids

机译：空间分离的电子-空穴液体中的激子和电荷密度波形成

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We present a microscopic many-body calculation investigating the competition between the charge density wave and exciton formation in coupled electron-hole layer systems at finite temperature. We find that as the layer separation is decreased there is a divergence at a finite wave vector in the static susceptibility, indicating an instability in the liquid to a coupled charge density wave. We also see evidence in the pair correlation function g(r) for the liquid phase of a divergence occurring at small r when the layer separation is reduced sufficiently, which would indicate the onset of a bound state instability. However, the charge density wave instability occurs in the liquid before g(r) can actually diverge. The unified picture which starts to emerge from our results is of a charge density wave instability occurring in the liquid phase at a layer separation larger than the exciton radius. This leaves open the possibility of a second transition from the charge density wave state to the excitonic phase. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 17]
机译：我们提出了微观多体计算，研究了在有限温度下耦合电子-空穴层系统中电荷密度波与激子形成之间的竞争。我们发现，随着层间距的减小，静态磁化率在有限波矢量处发散，表明液体对耦合电荷密度波的不稳定性。我们还看到在成对相关函数g（r）中，当层间距充分减小时，在小r处发生发散的液相的证据，这将表明束缚态不稳定性的开始。但是，在g（r）实际发散之前，液体中会发生电荷密度波不稳定性。从我们的结果开始出现的统一图片是电荷密度波不稳定性在液相中以大于激子半径的层间距出现。这就留下了从电荷密度波状态到激子相的第二过渡的可能性。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：17]

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