Temperature dependence of the intersubband transitions of doped quantum wells

Gumbs, Godfrey; Huang, Danhong; Loehr, John P.

doi:10.1103/physrevb.51.4321

Cited by 28 publications

(16 citation statements)

References 25 publications

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“…It is, however, known that intersubband absorption is strongly modified by various collective excitations, such as Fermi-edge singularity (FES) and intersubband plasmon (ISP). Such collective excitations as a result of Coulomb interaction have been investigated extensively for ISBRs [3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The current understanding of many-body effects in ISBRs can be summarized as follows: Using the self-consistent field approach [17], ISBR oscillator strength was shown [5,11] to ''collapse'' into a sharp collective mode, which is blueshifted relative to the free-carrier spectrum.…”

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confidence: 99%

Interplay of Collective Excitations in Quantum-Well Intersubband Resonances

Ning

2003

Phys. Rev. Lett.

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Intersubband resonances in a semiconductor quantum well (QW) display fascinating features involving various collective excitations such as Fermi-edge singularity (FES) and intersubband plasmon (ISP). Using a density matrix approach, we treated many-body effects such as depolarization, vertex correction, and self-energy consistently for a two-subband system. We found a systematic change in resonance spectra from FES- to ISP-dominated features, as QW width or electron density is varied. Such an interplay between FES and ISP significantly changes both line shape and peak position of the absorption spectrum. We found that a cancellation of FES and ISP undresses the resonant responses and recovers the single-particle features of absorption for semiconductors with a strong nonparabolicity such as InAs, leading to a dramatic broadening of the absorption spectrum.

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confidence: 99%

Interplay of Collective Excitations in Quantum-Well Intersubband Resonances

Ning

2003

Phys. Rev. Lett.

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“…The other interesting feature is the negative sign, in contradiction with the logical sense of a repulsion interaction. This characteristic is also presented in electronic systems [30].…”

Section: Mathematical Methodsmentioning

confidence: 89%

Thomas–Fermi–Dirac calculations of valence band states in two p‐type delta‐doped ZnSe quantum wells

Rodrı́guez-Vargas

Gaggero‐Sager²,

Martı́nez-Orozco

2005

Physica Status Solidi (b)

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PACS 73.21.Fg, 73.61.Ga We present the hole sub-band structure study in two p-type δ -doped ZnSe QW's. An analytical expression for the Hartree-Fock potential is obtained following the lines of the Thomas-Fermi-Dirac (TFD) approximation. We have analyzed the dependence of the hole energy levels to the impurity density and the interlayer distance between wells. The exchange effects are also included in the present survey. We find that many body effects cannot be ignored because these are really important in the calculation at least in the low concentration regime. We have obtained an energy difference between the top of the valence band and the ground energy of the heavy hole ladder of 0 29 0in good agreement with the experimental reports ( DAP 2 792 E = . eV) available. We calculate the mobility ratio between double δ -doped QW's and simple δ -doped QW based on a phenomenological formula. We find the optimum interlayer distance between wells for maximum mobility for three impurity concentrations, which can be of great importance for technological applications.

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“…For a conducting bulk medium, we use the random-phase approximation 17,18 ͑RPA͒ to obtain the transverse dielectric function in the long-wavelength limit as…”

Section: ͑10͒mentioning

confidence: 99%

Nonlocal mode mixing and surface-plasmon-polariton-mediated enhancement of diffracted terahertz fields by a conductive grating

et al. 2008

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This work generalizes our previous study of the effect of plasma-wave induced longitudinal fields ͓D. H. Huang et al. J. Appl. Phys. 100, 113711 ͑2006͔͒. We incorporate a conductive grating on top of a conducting sheet for generating and mixing Bragg modes arising from a reflected and/or transmitted electromagnetic field. It also generalizes our recent work on the coupling of electronically modulated two-dimensional plasmons with the surface plasmon ͓G. Gumbs and D. H. Huang, Phys. Rev. B 75, 115314 ͑2007͔͒ by including the retardation and longitudinal-field effects in calculating the diffracted near and far electromagnetic fields. The main result of this paper is the prediction of large enhancements at the band edges of a coupled Bloch-surfaceplasmon-polariton band in the spectrum of the reflected far electromagnetic field due to anticrossing gaps induced by the strong coupling between the continuous surface-plasmon-polariton mode and discrete Blochlike modes. The existence of these Bloch-like modes is a direct consequence of the nonlocal mixing of specular and diffraction modes of the reflected electromagnetic field by free-electron induced optical polarization and the interference of a pair of surface optical-polarization waves with opposite Bragg order numbers in the presence of a grating. The interference of these two counterpropagating surface waves leads to the formation of a Wannier-like state with associated electromagnetic fields localized within the grating-gap regions. The effects of the sheet density, plasmon instability, grating period, angle of incidence, and absorption loss on the optical enhancements of both transmitted and reflected electromagnetic fields are investigated.

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Temperature dependence of the intersubband transitions of doped quantum wells

Cited by 28 publications

References 25 publications

Interplay of Collective Excitations in Quantum-Well Intersubband Resonances

Interplay of Collective Excitations in Quantum-Well Intersubband Resonances

Thomas–Fermi–Dirac calculations of valence band states in two p‐type delta‐doped ZnSe quantum wells

Nonlocal mode mixing and surface-plasmon-polariton-mediated enhancement of diffracted terahertz fields by a conductive grating

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