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Plasmons in spatially separated rolled-up electron-hole double-layer systems

Bagheri, Mehran and Mousavi, Hamze and Kurdestany, Jamshid Moradi (2013) Plasmons in spatially separated rolled-up electron-hole double-layer systems. In: JOURNAL OF APPLIED PHYSICS, 114 (3).

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Official URL: http://dx.doi.org/10.1063/1.4813215


Using the two-component random phase approximation, we report the collective mode spectrum of a quasi-one-dimensional spatially separated electron-hole double-layer system characterized by rolled-up type-II band aligned quantum wells. We find two intra-subband collective excitations, which can be classified into optic and acoustic plasmon branches, and several inter-subband plasmon modes. At the long wavelength limit and up to a given wave vector, our model predicts and admits an undamped acoustic branch, which always lies in the gap between the intra-subband electron and hole continua, and an undamped optic branch residing within the gap between the inter-subband electron and hole continua, for all values of the electron-hole charge separations. This theoretical investigation suggests that the low-energy and Landau-undamped plasmon modes might exist based on quasi-one-dimensional, two-component spatially separated electron-hole plasmas, and their possibility could be experimentally examined. (C) 2013 AIP Publishing LLC.

Item Type: Journal Article
Additional Information: Copyright of this article is belongs to AMER INST PHYSICS
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 02 Oct 2013 14:57
Last Modified: 02 Oct 2013 14:57
URI: http://eprints.iisc.ac.in/id/eprint/47502

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