Calculation of exciton absorption in arbitrary layered semiconductor nanostructures with exact treatment of the Coulomb singularity

Ahland, A.; Wiedenhaus, M.; Schulz, D.; Voges, E.

doi:10.1109/3.848357

Cited by 18 publications

(11 citation statements)

References 22 publications

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“…represents the undisturbed Hamiltonian (14) where the second term, the Coulomb term, includes the absolute distance between electron and hole. The potential energy is treated as ; and are the potentials at the respective positions of electron and hole [10]. Consequently, the main mechanisms in electroabsorption modulators, the effect of electroabsorption (the FKE), the QCSE, and the WSE, can be described.…”

Section: Semiconductor Equationsmentioning

confidence: 99%

“…Since the complex susceptibility is calculated, there is no need for using the Kramers-Kronig relation. From this, we derive an effective dielectric constant [10]…”

Section: Semiconductor Equationsmentioning

confidence: 99%

“…The singularity of the Coulomb interaction term in this equation makes a decisive contribution to the optical spectrum. It can be treated exactly in the limits of the discretization [10], which is realized here for the first time. The density matrix formalism allows one to account for nanostructures, which, due to the QCSE, yield a higher bandwidth and an improved modulation depth.…”

Section: Introductionmentioning

confidence: 99%

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Dynamical simulation of quantum-well structures

Wiedenhaus

Ahland

Schulz

et al. 2001

IEEE J. Quantum Electron.

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For the design and development of optical semiconductor devices based on quantum-well structures, the investigation of saturation phenomena is necessary for high optical power operation. By applying stationary physical models, nonlinear effects cannot be described adequately; hence, transient models are important for an accurate analysis. By utilizing transient models, saturation phenomena, signal delays, and distortions can be investigated. For the analysis of integrated optoelectronic devices, such as lasers and modulators, transient transport or density matrix equations for carriers and photons and the Poisson equation have to be solved self-consistently. A transient model which is useful for the investigation of a wide range of optoelectronic applications is presented. Quantum optical phenomena are included by applying the interband density matrix formalism in real-space representation, where the Coulomb singularity is treated exactly in the limits of the discretization. As we focus on electroabsorption modulators, a drift-diffusion model adequately approximates the transport properties. Here, quantum effects are considered by a quantum correction, the Bohm potential. The model is applied to investigate transport effects in InPbased waveguide electroabsorption modulators including strained lattices.

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Section: Semiconductor Equationsmentioning

confidence: 99%

“…Since the complex susceptibility is calculated, there is no need for using the Kramers-Kronig relation. From this, we derive an effective dielectric constant [10]…”

Section: Semiconductor Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamical simulation of quantum-well structures

Wiedenhaus

Ahland

Schulz

et al. 2001

IEEE J. Quantum Electron.

Self Cite

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“…They have also been adopted in calculations of electronic tunneling rates (imaginary parts of complex eigenenergies) for resonant tunneling diodes [7] and metal-oxide-semiconductor junctions [8], from which carriers escape without returning. In addition, these setups were utilized in the (magneto-) excitonic absorption within the two-band model [3,9,10]. Comparisons between cases with/without PMLs do show their essences [3].…”

Section: Introductionmentioning

confidence: 99%

Bound-to-continuum absorption with tunneling in type-II nanostructures: a multiband source-radiation approach

Hsieh

Chang

2013

Opt. Express

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We convert calculations of the bound-to-continuum absorption in type-II semiconductor quantum wells into an equivalent source-radiation problem under the effective-mass approximation with band mixing. Perfectly matched layers corresponding to the eight-band Luttinger-Kohn Hamiltonian are introduced to incorporate the effect of quasi-bound states in open regions. In this way, the interplay between quantum tunneling and optical transitions is fully taken into account. From resulted lineshapes of the Fano resonance, we can evaluate tunneling rates of these metastable states and related absorption strengths relative to those of the continuum. The approach here is useful in estimations of carrier extraction rates from type-II nanostructures for photovoltaic applications.

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“…The electrochemical characterization of the process was done by using chronocoulometry, voltammetry and exhaustive coulometry 6, 7. The oxidation involved the aniline N atom and resulted to be a two‐step one‐electron reversible process, coupled with irreversible chemical reactions (EC mechanism).…”

Section: Introductionmentioning

confidence: 99%

Analytical Determination and Electrochemical Characterization of the Oxazolidinone Antibiotic Linezolid

Merli¹,

Pretali²,

Fasani³

et al. 2011

Electroanalysis

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Linezolid belongs to a class of antibiotics known as oxazolidinones. It is receiving great attention due to its activity toward multidrugs resistant bacteria, and simple and cheap methods for the analysis of this compound in pharmaceutical preparations are required. In this work, the electrochemistry of the antibiotic linezolid was investigated and a differential pulse voltammetric method based on the oxidation of the oxazolidinonic compound at a glassy carbon electrode has been developed and optimized for its determination; LOD of 50 mg L À1 and a linearity up to 200 mg L À1 were reported. The electrochemical process was studied by using different electrochemical techniques and confirmed by HPLC-MS/MS.

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Calculation of exciton absorption in arbitrary layered semiconductor nanostructures with exact treatment of the Coulomb singularity

Cited by 18 publications

References 22 publications

Dynamical simulation of quantum-well structures

Dynamical simulation of quantum-well structures

Bound-to-continuum absorption with tunneling in type-II nanostructures: a multiband source-radiation approach

Analytical Determination and Electrochemical Characterization of the Oxazolidinone Antibiotic Linezolid

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