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Bootsmann, M.-T.; Hu, Chang‐Ming; Heyn, Ch.; Heitmann, D.; Schüller, Christian

doi:10.1103/physrevb.67.121309

Cited by 21 publications

(10 citation statements)

References 20 publications

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“…With decreasing barrier height and thickness the tunneling effects become more appreciable and the plasmon gap grows to become more significant. These results are consistent with the long wavelength behavior of plasmons in double quantum well systems [4][5][6][7]. As we are interested in the effects of exchange-correlation potential on the plasmon dispersions we concentrate on the large wave vector region.…”

Section: (B) For 10supporting

confidence: 85%

“…We follow the analyses of previous works [3,[5][6][7] to calculate the plasmon dispersions by solving for the zeros of the dielectric matrix ε(q, ω), with and without the exchange-correlation effects by including and omitting V xc , respectively. Our numerical results are presented in the next section.…”

Section: Original Papermentioning

confidence: 99%

“…Our motivation comes from a number of recent studies addressing the plasmon dispersions in double quantum well systems [4][5][6][7] and given the wide device applications [8][9][10] as mentioned above we would like to assess the importance of exchange-correlation effects in these structures. The composition of the system is designed from GaAs-GaAlAs structures.…”

Section: Introductionmentioning

confidence: 99%

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Effect of exchange–correlation potential on the plasmon dispersions in a doped symmetrical double quantum well

Tüzemen

Turkoglu

Ergün

et al. 2007

Physica Status Solidi (b)

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We have calculated the plasmon dispersion relations in a doped double quantum well with and without exchange -correlation potential added to the effective potential of the system. The calculations were done for high and low doping densities by solving the Schrödinger and Poisson equations self-consistently. Our numerical results show that the exchange -correlation potential is quite important at high doping densities of donor impurities for plasmon dispersions at large wave vectors. On the other hand, the ratio of subband populations n i to donor density N D is more affected at low densities.

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Section: (B) For 10supporting

confidence: 85%

Section: Original Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of exchange–correlation potential on the plasmon dispersions in a doped symmetrical double quantum well

Tüzemen

Turkoglu

Ergün

et al. 2007

Physica Status Solidi (b)

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“…Theoretical investigations over the past years generally predict that AP could exist under appropriate conditions in doped semiconductors and in some transition-metal compounds, while their experimental manifestations have been taken up the challenges. [39][40][41][42][43] Some efforts show that the ideal solid state devices to explore the APs could be the spatially separated multi-component semiconductor systems. Owing to sever suppression of single-particle excitations (SPEs), the plasmon modes in onedimensional electron-hole(e-h) plasma might be completely free of damping over wide ranges of different geometrical and physical parameters.…”

Section: Introductionmentioning

confidence: 99%

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

Bagheri

Mousavi

Kurdestany

2013

Journal of Applied Physics

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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.

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“…Double quantum wells (DQWs) play an important role in designing and fabricating optoelectronic devices, e.g., near‐infrared photodetectors, full‐visible spectrum LEDs, and quantum cascade lasers 1, 2. Experiments related to the optical and electronic properties of DQWs 3–5 stimulated the development of theories. In early years, Kamizato and Matsuura 6 and Zhao et al 7 calculated the binding energies of ground‐state excitons in GaAs/AlGaAs symmetric DQWs and obtained the dependence of binding energies on the well width.…”

Section: Introductionmentioning

confidence: 99%

Binding energies of excitons in strained [0001]‐oriented wurtzite AlGaN/GaN double quantum wells

Zhu

Ban

2010

Physica Status Solidi (b)

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A variational method combined with a numerical computation is adopted to investigate binding energies of excitons in wurtzite AlGaN/GaN double quantum wells. The strain modification on material parameters and the built-in electric fields (BEFs) produced by spontaneous and strain-induced piezoelectric polarization are taken into account. The dependences of excitonic binding energies on the structural dimension including the widths of asymmetric wells and central barrier are presented. The results indicate that the BEF, which is very strong and can be exactly modulated by the structural dimension, plays a dominant role in determining the binding energy. The exciton is almost indirect one for an asymmetric well influenced by the BEF. The binding energy is very small and is insensitive to the structural dimension. The variation of binding energy versus the widths of both the wells and central barrier in an asymmetric structure is rather different from that in a symmetric one.

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Acoustic plasmons and indirect intersubband excitations in tunneling-coupledGaAs−Alx

Cited by 21 publications

References 20 publications

Effect of exchange–correlation potential on the plasmon dispersions in a doped symmetrical double quantum well

Effect of exchange–correlation potential on the plasmon dispersions in a doped symmetrical double quantum well

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

Binding energies of excitons in strained [0001]‐oriented wurtzite AlGaN/GaN double quantum wells

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