Optics of quantum dots and rings

Nonlinear Fano effect in quantum dots

Nature, 451, 311 - 314 (2008)

Optically-induced hybridization of a quantum dot state with a filled continuum

M. Ediger, P. A. Dalgarno, B. D. Gerardot, J. M. Smith, S. Seidl, M. Kroner, K. Karrai, P. M. Petroff, A. O. Govorov, and R. J. Warburton, Phys. Rev. Lett., 100, 176801 (2008)

Optical Aharonov-Bohm effect in quantum rings and dots

Magnetoexcitons in type-II quantum dots
Polarized excitons in nanorings and optical Aharonov-Bohm effect
Aharonov-Bohm signature for neutral excitons in type-II quantum rings

Optical Aharonov-Bohm effect in stacked ZnTe/ZnSe type-II quantum dots

Aharonov-Bohm Excitons at Elevated Temperatures in Type-II Quantum Dots
Phys. Rev. Lett., 100, 136405 (2008)

Kondo excitons and voltage control of spin

Kondo excitons in self-assembled quantum dots Hybridization of electronic states in quantum dots through photon emission (Nature 427, p. 135, 2004) Voltage-control of the spin flip rate of an exciton in a semiconductor quantum dot

Energy and spin transfer in quantum dots and bio-conjugates

Spin and energy transfer in nanocrystals without tunneling (Phys. Rev. B, 2003) Spin-dependent Foerster transfer in optically excited quantum dots (Phys. Rev. B, 2005).   Bioconjugated Superstructures of CdTe Nanowires and Nanoparticles: Multi-Step Cascade Fluorescence Resonance Energy Transfer (Nano Letters, 2005)

Exciton-plasmon interactions in metal-semiconductor nanoparticle molecules

Bioconjugates of CdTe Nanowires and Au Nanoparticles: Plasmon-Exciton Interactions, luminescence Enhancement and Collective Effects (Nano Letters, 2004).

Exciton-Plasmon Interaction and Hybrid Excitons in Semiconductor-Metal Nanoparticle Assemblies” (Nano Lett., 2006).

Semiconductor-metal nanoparticle molecules: hybrid excitons and non-linear Fano effect (Phys. Rev. Lett., 2006). 

Bioconjugated Ag nanoparticles and CdTe Nanowires: Luminescence Enhancement in Metamaterials Due to Field-Enhanced Light Absorption. (Angewandte Chemie, 2006).

Exciton–plasmon interactions in molecular spring assemblies of nanowires and wavelength-based protein detection, Nature Materials 6, pp. 291 - 295 (2007). 

Hybrid Structures Composed of Photosynthetic System and Metal Nanoparticles: Plasmon Enhancement Effect. Nano Lett. 7, 620-625 (2007).

Patent Application:
(WO/2006/128181) NANOPARTICLE ASSEMBLIES WITH MOLECULAR SPRING

Kotov, N.,
Lee, J.,
Govorov, A.

Photo-thermal effects in nanoparticle assemblies

Gold Nanoparticle Ensembles as Heaters and Actuators: melting and collective plasmon resonances ( Nanoscale Res. Lett. 2006)

Generating heat with metal nanoparticles”, (NanoToday 2007).

Mn impurity in a QD: probing and manipulation

Optical probing of the spin state of a single magnetic impurity in a self-assembled quantum dot (Phys. Rev. B, 2004)  Optical properties and spin polarization of a semiconductor quantum dot with a single magnetic impurity (Phys. Rev. B, 2005)

Magnetic properties of quantum dots

Magnetic quantum dots and quantum-dot molecules with few electrons:
Magnetic polarons in confined geometries

Magnetic semiconductor artificial atom with many particles: Thomas-Fermi model and ferromagnetic phases (Phys. Rev. B, 2005)  Link

Voltage-tunable ferromagnetism in semi-magnetic quantum dots: magnetic polarons and electrical capacitance (Phys. Rev. B, 2005). Link

Electronic states in a magnetic quantum-dot molecule: phase transitions and spontaneous symmetry breaking (Phys. Rev. B, 2007). Link

Transport

Nonlinear Charge Spreading Visualized in Voltage-Controlled Lateral Superlattices Interacting Fermi electron jets in a 2D gas: Hydrodynamic effects Spin-dependent transport of electrons in the presence of a smooth lateral barrier and spin-orbit interaction

Intense surface acoustic waves in 2D electron systems

Charge conveyance and nonlinear acoustoelectric phenomena for intense surface acoustic waves on a semiconductor quantum well Nonlinear acoustoelectric transport in a two-dimensional electron system Self-induced acoustic transparency in semiconductor quantum films
	Achim Wixforth/Augsburg