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155. Room temperature spin relaxation length in spin light-emitting diodes

Author

Soldat, Henning, primary, Li, Mingyuan, additional, Gerhardt, Nils C., additional, Hofmann, Martin R., additional, Ludwig, Arne, additional, Ebbing, Astrid, additional, Reuter, Dirk, additional, Wieck, Andreas D., additional, Stromberg, Frank, additional, Keune, Werner, additional, and Wende, Heiko, additional

Published
2011
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164. Tuning quantum-dot based photonic devices with liquid crystals

Author

Piegdon, Karoline A., primary, Declair, Stefan, additional, Förstner, Jens, additional, Meier, Torsten, additional, Matthias, Heiner, additional, Urbanski, Martin, additional, Kitzerow, Heinz-S., additional, Reuter, Dirk, additional, Wieck, Andreas D., additional, Lorke, Axel, additional, and Meier, Cedrik, additional

Published
2010
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172. Genomic Analyses of Cryptobiotic Tardigrades

Author

Mali, Brahim, primary, Grohme, Markus, additional, Wełnicz, Weronika, additional, Dandekar, Thomas, additional, Schnölzer, Martina, additional, Reuter, Dirk, additional, Schill, Ralph O., additional, and Frohme, Marcus, additional

Published
2008
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177. Spin-controlled vertical cavity surface-emitting lasers

Author

Hövel, Stephan, primary, Gerhardt, Nils C., additional, Brenner, Carsten, additional, Hofmann, Martin R., additional, Lo, Fang-Yuh, additional, Reuter, Dirk, additional, Wieck, Andreas D., additional, Schuster, Ellen, additional, and Keune, Werner, additional

Published
2006
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181. Spin-controlled LEDs and VCSELs

Author

Gerhardt, Nils C., primary, Hoevel, Stephan, additional, Brenner, Carsten, additional, Hofmann, Martin R., additional, Yang, Junling, additional, Reuter, Dirk, additional, and Wieck, Andreas D., additional

Published
2005
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186. Upscaling and Automation of Electrophysiology: Toward High Throughput Screening in Ion Channel Drug Discovery

Author

Asmild, Margit, primary, Oswald, Nicholas, additional, Krzywkowski, Karen M., additional, Friis, Søren, additional, Jacobsen, Rasmus B., additional, Reuter, Dirk, additional, Taboryski, Rafael, additional, Kutchinsky, Jonathan, additional, Vestergaard, Ras K., additional, Schrøder, Rikke L., additional, Sørensen, Claus B., additional, Bech, Morten, additional, Korsgaard, Mads P. G., additional, and Willumsen, Niels J., additional

Published
2003
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187. Momentum Space Wave Functions in InAs Quantum Dots Mapped by Capacitance Voltage Spectroscopy.

Author

Haug, Rolf and Reuter, Dirk

Abstract

We have investigated the charging of conduction as well as the valence band states of InAs quantum dots by magneto capacitance voltage spectroscopy. Whereas measurements in magnetic fields perpendicular to the base plane of the quantum dots reveal the dispersion of the single particle levels and help to identify the corresponding charging peaks, measurements in parallel magnetic fields allow the mapping of the momentum space wave functions corresponding to the individual charging peaks. The wave function maps directly visualize anisotropies in the confinement potential. For electrons, a sequential filling of a shell-like energy level structure is observed and the results can be explained well by using a harmonic approximation for the lateral confinement potential and a single effective mass. For holes, the charging behaviour is more complicated. The dispersion measurements in conjunctions with wave function maps show that the orbital angular momentum cannot be treated as good quantum number and more complex theories have to be used. Electron as well as hole wave function reveal an anisotropy in the confinement potential with the low energy axis along the [0-11] direction. [ABSTRACT FROM AUTHOR]

Published
2008
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198. Intentionally positioned self-assembled InAs quantum dots in an electroluminescent p–i–n junction diode

Author

Mehta, Minisha, Reuter, Dirk, Melnikov, Alexander, Wieck, Andreas D., Michaelis de Vasconcellos, Steffen, Baumgarten, Tim, Zrenner, Artur, and Meier, Cedrik

Subjects
*MOLECULAR self-assembly, *ARSENIDES, *MOLECULAR beam epitaxy, *QUANTUM dots, *ELECTROLUMINESCENCE, *SEMICONDUCTOR diodes, *SEMICONDUCTOR junctions, *FOCUSED ion beams, *MICROFABRICATION
Abstract

Abstract: An intentional positioning of optically active quantum dots using site-selective growth by a combination of molecular beam epitaxy (MBE) and focused ion beam (FIB) implantation in an all-ultra-high-vacuum (UHV) setup has been successfully demonstrated. A square array of periodic holes on GaAs substrate was fabricated with FIB of 30keV ions followed by an in situ annealing step. Subsequently, the patterned holes were overgrown with an optimized amount of InAs in order to achieve site-selective growth of the QDs on the patterned holes. Under well-optimized conditions, a selectivity of single quantum dot growth in the patterned holes of 52% was achieved. Thereafter, carrier injection and subsequent radiative recombination from the positioned InAs/GaAs self-assembled QDs was investigated by embedding the QDs in the intrinsic part of a GaAs-based p–i–n junction device. Electroluminescence spectra taken at 77K show interband transitions up to the fifth excited state from the QDs. [ABSTRACT FROM AUTHOR]

Published
2010
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199. A Two-Dimensional Electron Gas as a Sensitive Detector for Time-Resolved Tunneling Measurements on Self-Assembled Quantum Dots.

Author

Geller, Martin, Marquardt, Bastian, Lorke, Axel, Reuter, Dirk, and Wieck, Andreas D.

Subjects
ELECTRON gas, QUANTUM dots, QUANTUM tunneling, ELECTRON mobility, HYSTERESIS, ELECTRONS, ELECTRIC transients
Abstract

A two-dimensional electron gas (2DEG) situated nearby a single layer of self-assembled quantum dots (QDs) in an inverted high electron mobility transistor (HEMT) structure is used as a detector for time-resolved tunneling measurements. We demonstrate a strong influence of charged QDs on the conductance of the 2DEG which allows us to probe the tunneling dynamics between the 2DEG and the QDs time resolved. Measurements of hysteresis curves with different sweep times and real-time conductance measurements in combination with an boxcar-like evaluation method enables us to unambiguously identify the transients as tunneling events between the s- and p-electron QD states and the 2DEG and rule out defect-related transients. [ABSTRACT FROM AUTHOR]

Published
2010
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200. Transcriptome survey of the anhydrobiotictardigrade Milnesium tardigradum in comparisonwith Hypsibius dujardini and Richtersius coronifer.

Author

Mali, Brahim, Grohme, Markus A., Förster, Frank, Dandekar, Thomas, Schnölzer, Martina, Reuter, Dirk, Wełnicz, Weronika, Schill, Ralph O., and Frohme, Marcus

Subjects
GENES, NUCLEOTIDE sequence, HEREDITY, ANHYDROBIOSIS, DNA
Abstract

Background: The phenomenon of desiccation tolerance, also called anhydrobiosis, involves the ability of an organism to survive the loss of almost all cellular water without sustaining irreversible damage. Although there are several physiological, morphological and ecological studies on tardigrades, only limited DNA sequence information is available. Therefore, we explored the transcriptome in the active and anhydrobiotic state of the tardigrade Milnesium tardigradum which has extraordinary tolerance to desiccation and freezing. In this study, we present the first overview of the transcriptome of M. tardigradum and its response to desiccation and discuss potential parallels to stress responses in other organisms. Results: We sequenced a total of 9984 expressed sequence tags (ESTs) from two cDNA libraries from the eutardigrade M. tardigradum in its active and inactive, anhydrobiotic (tun) stage. Assembly of these ESTs resulted in 3283 putative unique transcripts, whereof ~50% showed significant sequence similarity to known genes. The resulting unigenes were functionally annotated using the Gene Ontology (GO) vocabulary. A GO term enrichment analysis revealed several GOs that were significantly underrepresented in the inactive stage. Furthermore we compared the putative unigenes of M. tardigradum with ESTs from two other eutardigrade species that are available from public sequence databases, namely Richtersius coronifer and Hypsibius dujardini. The processed sequences of the three tardigrade species revealed similar functional content and the M. tardigradum dataset contained additional sequences from tardigrades not present in the other two. Conclusions: This study describes novel sequence data from the tardigrade M. tardigradum, which significantly contributes to the available tardigrade sequence data and will help to establish this extraordinary tardigrade as a model for studying anhydrobiosis. Functional comparison of active and anhydrobiotic tardigrades revealed a differential distribution of Gene Ontology terms associated with chromatin structure and the translation machinery, which are underrepresented in the inactive animals. These findings imply a widespread metabolic response of the animals on dehydration. The collective tardigrade transcriptome data will serve as a reference for further studies and support the identification and characterization of genes involved in the anhydrobiotic response. [ABSTRACT FROM AUTHOR]

Published
2010
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