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Last updated
April 27, 2010 |
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| My areas of major interest are:
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What is my research about?
My work is mostly concerned with the nonlinear interaction of light with matter, and with the related many-particle physics
underlying optical excitations in semiconductor (nano)systems. Systems
of current interest include: single and multiple
semiconductor-quantum-well structures, semiconductor microcavities,
semiconductor quantum dots, and organic (molecular) semiconductor systems.
Why bother? Why is this interesting?
on the fundamental research level:
we study the physics and photonics of semiconductor nanostructures. We
develop microscopic theoretical models to describe nonlinear
light-matter interaction and many-particle effects in these systems.
Based on these models, and in conjunction with experiments, we use
light as a probing tool to gain insight into excitation dynamics and
optical properties of semiconductor (nano)systems on femtosecond
timescales.
beyond pure basic research:
we use our basic understanding of light and matter interaction to
envision strategies and concepts for novel light manipulation schemes.
These can potentially be utilized in everyday optoelectronics and
photonics applications, such as all-optical amplifiers, all-optical switches, and lasers,...
Interested in more details? Check out my main research projects and some recent publications below.
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Organic semiconductors (physics and photonics, excitation dynamics, all-optical switches, amplifiers, and lasers)
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"Dynamics of photoexcitation and stimulated optical emission in
conjugated polymers: a multiscale quantum-chemistry and
Maxwell-Bloch-equations approach", S. Schumacher, I. Galbraith, A. Ruseckas, G. A. Turnbull, and I. D. W. Samuel, Phys. Rev. B 81, 245407 (2010), PDF
"Effect of exciton self-trapping and molecular conformation on photophysical properties of oligofluorenes", J. Chem. Phys. 131, 154906 (2009), PDF
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Electron-spin coherent exciton optics (in semiconductor quantum wells) |
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''Electron-spin beat susceptibility of excitons in semiconductor quantum wells'', Phys. Rev. Lett. 103, 056405 (2009), PDF |
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Optical instabilities in quantum-well based systems (transverse pattern formation and manipulation for all-optical switching; polariton amplification and stimulated scattering)
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"Transverse optical patterns for ultra-low-light-level all-optical switching",
Laser & Photonics Reviews 4, 221 (2010), PDF
 ''Low intensity directional switching of light in semiconductor microcavities'',
Physica Status Solidi (Rapid Research Letters) 3, 10 (2009), PDF
''Spatial anisotropy of polariton amplification in semiconductor microcavities induced by polarization anisotropy'',
Phys. Rev. B 77, 073302 (2008), PDF
''All-optical signal amplification in multiple-quantum-well resonant photonic bandgap structures'',
Appl. Phys. Lett. 92, 131109 (2008), PDF
''Large optical gain from four-wave mixing instabilities in semiconductor quantum wells'',
Europhys. Lett. 81, 27003 (2008), PDF
''Influence of exciton-exciton correlations on the polarization
characteristics of the polariton amplification in semiconductor
microcavities'', Phys. Rev. B 76, 245324 (2007), PDF |
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Semiconductor quantum dots (electronic and optical properties, combined atomistic tight-binding and full-configuration-interaction calculations) |
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''Spin-orbit coupling and crystal-field splitting in the electronic and optical properties of nitride quantum
dots with a wurtzite crystal structure'',
Eur. Phys. J. B 64, 51 (2008), PDF
 ''Influence of symmetry and Coulomb-correlation effects on the optical properties of nitride quantum dots'', Phys. Rev. B 76, 075310 (2007), PDF
''Tight-binding
model for semiconductor quantum dots with a wurtzite crystal structure:
from one-particle properties to Coulomb correlations and optical
spectra'', Phys. Rev. B 73, 245327 (2006), PDF
''Optical
properties of self-organized wurtzite InN/GaN quantum dots: a combined
atomistic tight-binding and full configuration interaction calculation'',
Appl. Phys. Lett. 87, 231114 (2005), PDF |
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Polariton propagation (additional-boundary conditions problem, linear and nonlinear)
''Coherent propagation of polaritons in the nonlinear optical regime'',
Phys. Rev. B 73, 035318 (2006), PDF
''Optical coherent manipulation of polariton modes and of their radiative decay'', Phys. Rev. B 73, 235345 (2006), PDF
''Coherent propagation of polaritons in semiconductor heterostructures:
nonlinear pulse transmission in theory and experiment'', Phys. Rev. B 72, 081308(R) (2005), PDF
''Polariton propagation in shallow-confinement heterostructures: microscopic theory
and experiment showing the breakdown of the dead-layer concept'', Phys. Rev. B 70, 235340 (2004), PDF
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