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Spin-polarized electron-hole quantum bilayers: finite layer width and mass-asymmetric effects

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Abstract

The influence of mass-asymmetry and finite layer width in phase-transition from the liquid-state to the density-modulated ground-state of the spin-polarized electron-hole quantum bilayers (EHBL) is explored within the Singwi, Tosi, Land and Sjölander (qSTLS) approach. At the same number density of electrons and holes, in addition to the stronger interlayer correlations, the mass-asymmetry also shows stronger intralayer correlations in the hole layer than that of the electron layer. This change in the behaviour of correlations affects the ground-state of the spin-polarized EHBL system. Interestingly, we notice the enhancement of critical density for the onset of Wigner crystallization as compared to the recent results of spin-polarized mass-symmetric EHBL system. Pair-correlation function and local-field correction factor show a strong in-phase oscillations at the instability region. Further, we find that the inclusion of finite layer width weakens the intralayer correlations. As a result, the critical density for Wigner crystallization is lowered. The present results are compared with the recent results of spin-polarized (and unpolarized) mass-symmetric EHBL with zero (finite) layer width.

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Authors and Affiliations

  1. Department of Applied Physics, S.V. National Institute of Technology, 395007, Surat, India

    Mukesh Gangadhar Nayak & Lalit Kumar Saini

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  1. Mukesh Gangadhar Nayak
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  2. Lalit Kumar Saini
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Correspondence to Lalit Kumar Saini.

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Contribution to the Topical Issue “Excitonic Processes in Condensed Matter, Nanostructured and Molecular Materials”, edited by Maria Antonietta Loi, Jasper Knoester and Paul H. M. van Loosdrecht.

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Nayak, M.G., Saini, L.K. Spin-polarized electron-hole quantum bilayers: finite layer width and mass-asymmetric effects. Eur. Phys. J. B 86, 84 (2013). https://doi.org/10.1140/epjb/e2013-30654-x

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  • DOI: https://doi.org/10.1140/epjb/e2013-30654-x

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