@article{13548, author = {{Thissen, Peter and Thissen, Vera and Wippermann, Stefan and Chabal, Yves J. and Grundmeier, Guido and Schmidt, Wolf Gero}}, issn = {{0039-6028}}, journal = {{Surface Science}}, pages = {{902--907}}, title = {{{pH-dependent structure and energetics of H2O/MgO(100)}}}, doi = {{10.1016/j.susc.2012.01.018}}, volume = {{606}}, year = {{2012}}, } @article{13543, author = {{Rauls, E. and Schmidt, Wolf Gero and Pertram, T. and Wandelt, K.}}, issn = {{0039-6028}}, journal = {{Surface Science}}, pages = {{1120--1125}}, title = {{{Interplay between metal-free phthalocyanine molecules and Au(110) substrates}}}, doi = {{10.1016/j.susc.2012.03.010}}, volume = {{606}}, year = {{2012}}, } @article{13560, author = {{Hölscher, R. and Sanna, S. and Schmidt, Wolf Gero}}, issn = {{1862-6351}}, journal = {{physica status solidi (c)}}, number = {{6}}, pages = {{1361--1365}}, title = {{{Adsorption of OH and H at the LiNbO3(0001) surface}}}, doi = {{10.1002/pssc.201100534}}, volume = {{9}}, year = {{2012}}, } @article{13539, author = {{Rode, S. and Hölscher, R. and Sanna, S. and Klassen, S. and Kobayashi, K. and Yamada, H. and Schmidt, Wolf Gero and Kühnle, A.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{7}}, title = {{{Atomic-resolution imaging of the polar (0001¯) surface of LiNbO3in aqueous solution by frequency modulation atomic force microscopy}}}, doi = {{10.1103/physrevb.86.075468}}, volume = {{86}}, year = {{2012}}, } @article{13534, author = {{Wall, Simone and Krenzer, Boris and Wippermann, Stefan and Sanna, Simone and Klasing, Friedrich and Hanisch-Blicharski, Anja and Kammler, Martin and Schmidt, Wolf Gero and Horn-von Hoegen, Michael}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{18}}, title = {{{Atomistic Picture of Charge Density Wave Formation at Surfaces}}}, doi = {{10.1103/physrevlett.109.186101}}, volume = {{109}}, year = {{2012}}, } @article{13536, author = {{Riefer, Arthur and Sanna, Simone and Gavrilenko, Alexander V. and Schmidt, Wolf Gero}}, issn = {{0885-3010}}, journal = {{IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control}}, number = {{9}}, pages = {{1929--1933}}, title = {{{Linear and nonlinear optical response of LiNbO3 calculated from first principles}}}, doi = {{10.1109/tuffc.2012.2409}}, volume = {{59}}, year = {{2012}}, } @article{13541, author = {{Landmann, M. and Köhler, T. and Köppen, S. and Rauls, E. and Frauenheim, T. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{6}}, title = {{{Fingerprints of order and disorder in the electronic and optical properties of crystalline and amorphous TiO2}}}, doi = {{10.1103/physrevb.86.064201}}, volume = {{86}}, year = {{2012}}, } @article{13531, author = {{Schmidt, Christian and Breuer, Tobias and Wippermann, Stefan and Schmidt, Wolf Gero and Witte, Gregor}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{24098--24106}}, title = {{{Substrate Induced Thermal Decomposition of Perfluoro-Pentacene Thin Films on the Coinage Metals}}}, doi = {{10.1021/jp307316r}}, volume = {{116}}, year = {{2012}}, } @article{13535, author = {{Sanna, S. and Schmidt, Wolf Gero}}, issn = {{0885-3010}}, journal = {{IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control}}, number = {{9}}, pages = {{1925--1928}}, title = {{{Ferroelectric phase transition in LiNbO3: Insights from molecular dynamics}}}, doi = {{10.1109/tuffc.2012.2408}}, volume = {{59}}, year = {{2012}}, } @article{13538, author = {{Riefer, A. and Sanna, S. and Schmidt, Wolf Gero}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{12}}, title = {{{Polarization-dependent methanol adsorption on lithium niobate Z-cut surfaces}}}, doi = {{10.1103/physrevb.86.125410}}, volume = {{86}}, year = {{2012}}, } @article{13820, author = {{Schmidt, Wolf Gero and Wippermann, S. and Sanna, S. and Babilon, M. and Vollmers, N. J. and Gerstmann, Uwe}}, issn = {{0370-1972}}, journal = {{physica status solidi (b)}}, number = {{2}}, pages = {{343--359}}, title = {{{In-Si(111)(4 × 1)/(8 × 2) nanowires: Electron transport, entropy, and metal-insulator transition}}}, doi = {{10.1002/pssb.201100457}}, volume = {{249}}, year = {{2012}}, } @article{15872, author = {{Montgomery, Neil A. and Hedley, Gordon J. and Ruseckas, Arvydas and Denis, Jean-Christophe and Schumacher, Stefan and Kanibolotsky, Alexander L. and Skabara, Peter J. and Galbraith, Ian and Turnbull, Graham A. and Samuel, Ifor D. W.}}, issn = {{1463-9076}}, journal = {{Physical Chemistry Chemical Physics}}, title = {{{Dynamics of fluorescence depolarisation in star-shaped oligofluorene-truxene molecules}}}, doi = {{10.1039/c2cp24141b}}, year = {{2012}}, } @article{3974, abstract = {{We study the quantum properties and statistics of photons emitted by a quantum-dot biexciton inside a cavity. In the biexciton-exciton cascade, fine-structure splitting between exciton levels degrades polarization-entanglement for the emitted pair of photons. However, here we show that the polarization-entanglement can be preserved in such a system through simultaneous emission of two degenerate photons into cavity modes tuned to half the biexciton energy. Based on detailed theoretical calculations for realistic quantum-dot and cavity parameters, we quantify the degree of achievable entanglement.}}, author = {{Schumacher, Stefan and Förstner, Jens and Zrenner, Artur and Florian, Matthias and Gies, Christopher and Gartner, Paul and Jahnke, Frank}}, issn = {{1094-4087}}, journal = {{Optics Express}}, keywords = {{tet_topic_qd}}, number = {{5}}, pages = {{5335--5342}}, publisher = {{OSA}}, title = {{{Cavity-assisted emission of polarization-entangled photons from biexcitons in quantum dots with fine-structure splitting}}}, doi = {{10.1364/oe.20.005335}}, volume = {{20}}, year = {{2012}}, } @inproceedings{1968, abstract = {{Infrastructure as a Service providers use virtualization to abstract their hardware and to create a dynamic data center. Virtualization enables the consolidation of virtual machines as well as the migration of them to other hosts during runtime. Each provider has its own strategy to efficiently operate a data center. We present a rule based mapping algorithm for VMs, which is able to automatically adapt the mapping between VMs and physical hosts. It offers an interface where policies can be defined and combined in a generic way. The algorithm performs the initial mapping at request time as well as a remapping during runtime. It deals with policy and infrastructure changes. We extended the open source IaaS solution Eucalyptus and we evaluated it with typical policies: maximizing the compute performance and VM locality to achieve a high performance and minimizing energy consumption. The evaluation was done on state-of-the-art servers in our own data center and by simulations using a workload of the Parallel Workload Archive. The results show that our algorithm performs well in dynamic data centers environments.}}, author = {{Kleineweber, Christoph and Keller, Axel and Niehörster, Oliver and Brinkmann, André}}, booktitle = {{Proc. Int. Conf. on Parallel, Distributed and Network-Based Computing (PDP)}}, title = {{{Rule Based Mapping of Virtual Machines in Clouds}}}, doi = {{10.1109/PDP.2011.69}}, year = {{2011}}, } @article{1971, abstract = {{System virtualization has become the enabling technology to manage the increasing number of different applications inside data centers. The abstraction from the underlying hardware and the provision of multiple virtual machines (VM) on a single physical server have led to a consolidation and more efficient usage of physical servers. The abstraction from the hardware also eases the provision of applications on different data centers, as applied in several cloud computing environments. In this case, the application need not adapt to the environment of the cloud computing provider, but can travel around with its own VM image, including its own operating system and libraries. System virtualization and cloud computing could also be very attractive in the context of high‐performance computing (HPC). Today, HPC centers have to cope with both, the management of the infrastructure and also the applications. Virtualization technology would enable these centers to focus on the infrastructure, while the users, collaborating inside their virtual organizations (VOs), would be able to provide the software. Nevertheless, there seems to be a contradiction between HPC and cloud computing, as there are very few successful approaches to virtualize HPC centers. This work discusses the underlying reasons, including the management and performance, and presents solutions to overcome the contradiction, including a set of new libraries. The viability of the presented approach is shown based on evaluating a selected parallel, scientific application in a virtualized HPC environment. }}, author = {{Birkenheuer, Georg and Brinkmann, André and Kaiser, Jürgen and Keller, Axel and Keller, Matthias and Kleineweber, Christoph and Konersmann, Christoph and Niehörster, Oliver and Schäfer, Thorsten and Simon, Jens and Wilhelm, Maximilan}}, journal = {{Software: Practice and Experience}}, publisher = {{John Wiley & Sons}}, title = {{{Virtualized HPC: a contradiction in terms?}}}, doi = {{10.1002/spe.1055}}, year = {{2011}}, } @inproceedings{1972, abstract = {{We present a multi-agent system on top of the IaaS layer consisting of a scheduler agent and multiple worker agents. Each job is controlled by an autonomous worker agent, which is equipped with application specific knowledge (e.g., performance functions) allowing it to estimate the type and number of necessary resources. During runtime, the worker agent monitors the job and adapts its resources to ensure the specified quality of service - even in noisy clouds where the job instances are influenced by other jobs. All worker agents interact with the scheduler agent, which takes care of limited resources and does a cost-aware scheduling by assigning jobs to times with low energy costs. The whole architecture is self-optimizing and able to use public or private clouds.}}, author = {{Niehörster, Oliver and Keller, Axel and Brinkmann, André}}, booktitle = {{Proc. Int. Meeting of the IEEE Int. Symp. on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS)}}, title = {{{An Energy-Aware SaaS Stack}}}, doi = {{10.1109/MASCOTS.2011.52}}, year = {{2011}}, } @inproceedings{2188, author = {{Miranda, Alberto and Effert, Sascha and Kang, Yangwook and Miller, Ethan and Brinkmann, André and Cortes, Toni}}, booktitle = {{Proc. Int. Conf. on High Performance Computing (HIPC)}}, pages = {{1--10}}, publisher = {{IEEE Computer Society}}, title = {{{Reliable and Randomized Data Distribution Strategies for Large Scale Storage Systems}}}, doi = {{10.1109/HiPC.2011.6152745}}, year = {{2011}}, } @inproceedings{2189, author = {{Grawinkel, Matthias and Pargmann, Markus and Dömer, Hubert and Brinkmann, André}}, booktitle = {{Proc. IEEE Int. Conf. on Parallel and Distributed Systems (ICPADS)}}, pages = {{380--387}}, publisher = {{IEEE}}, title = {{{Lonestar: An Energy-Aware Disk Based Long-Term Archival Storage System}}}, doi = {{10.1109/ICPADS.2011.77}}, year = {{2011}}, } @inproceedings{2190, author = {{Niehörster, Oliver and Brinkmann, André}}, booktitle = {{Proc. IEEE Int. Conf. on Cloud Computing Technology and Science (CloudCom)}}, pages = {{138--145}}, publisher = {{IEEE Computer Society}}, title = {{{Autonomic Resource Management Handling Delayed Configuration Effects}}}, doi = {{10.1109/CloudCom.2011.28}}, year = {{2011}}, } @inproceedings{2191, author = {{Kenter, Tobias and Plessl, Christian and Platzner, Marco and Kauschke, Michael}}, booktitle = {{Intel European Research and Innovation Conference}}, keywords = {{funding-intel}}, title = {{{Estimation and Partitioning for CPU-Accelerator Architectures}}}, year = {{2011}}, }