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arXiv 1605.04748cond-mat.str-elcond-mat.mes-hall
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耦合量子阱中电子-空穴液体的量子相变

Quantum Phase Transition of the Electron-Hole Liquid In the Coupled Quantum Wells

V. S. Babichenko, I. Ya. Polishchuk

摘要:

研究了耦合量子阱中的多组分电子空穴等离子体。结果表明,如果载流子密度足够小,等离子体的均匀态是不稳定的。这种不稳定性导致了两种共存的相-低密度气相和高密度电子空穴液体的击穿。如果量子阱之间的距离l足够小,则电子-空穴液体的均匀状态是稳定的。然而,随着距离l增加并达到某一临界值,电子-空穴液体的等离子体激元光谱变得不稳定。由此,发生量子相变,导致在两个量子阱中出现有限振幅的电荷密度波。当量子相变发生时,电子-空穴液体存在强质量重整化和强Z因子重整化。

英文摘要:

Many-component electron-hole plasma is considered in the Coupled Quantum Wells (CQW). It is found that the homogeneous state of the plasma is unstable if the carrier density is sufficiently small. The instability results in the breakdown into two coexisting phase - a low-density gas phase and a high-density electron-hole liquid. The homogeneous state of the electron-hole liquid is stable if the distance between the quantum wells l is sufficiently small. However, as the distance l increases and reaches a certain critical value, the plasmon spectrum of the electron-hole liquid becomes unstable. Hereupon, a quantum phase transition occurs, resulting in the appearance of the charge density waves of finite amplitude in both quantum wells. The strong mass renormalization and the strong Z-factor renormalization are found for the electron-hole liquid as the quantum phase transition occurs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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