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Proximity Effect in Normal-Superconductor Hybrids at the Nanoscale

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Journal of Applied Mathematics and Physics 2014年第8期2卷 745-752页

作者： henning soller Institut für Theoretische Physik Universitat HeidelbergHeidelbergGermany

We analyse the proximity effect in hybrid nanoscale junctions involving superconducting leads. We develop a general framework for the analysis of the proximity effect using the same theoretical methods typically employed for the analysis of conductance properties. We apply our method to a normal-superconductor tunnel contact and compare our results to previous results.

关键词： Superconductors Proximity Effect Hybrid Nanoscale Junctions Conductance

Exciton Condensates and Superconductors-Technical Differences and Physical Similarities

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Journal of Applied Mathematics and Physics 2015年第9期3卷 1218-1225页

作者： henning soller Institut für Theoretische Physik Universit&#228 t Heidelberg Heidelberg Germany

We review several recent theoretical and experimental results in the study of exciton condensates. This includes the present experimental advances in the study of exciton condensates both using layers and coupled bilayers. We will shortly illustrate the different phases of exciton condensates. We focus especially on the Bardeen-Cooper-Schrieffer-like phase and illustrate the similarities to superconductors. Afterwards, we want to illustrate several recent advances and proposals for measuring the different phases of superconductors. In the remainder of this short review, we will provide an outlook for the possibilities and complications for future technical applications of exciton condensates.

关键词： Exciton Condensate Entanglement Coupled Bilayer Laser Illuminated Bardeen-Cooper-Schrieffer Solar Cells

Superconductor Hybrids-Electronic Paths to Quantum Computing

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Journal of Applied Mathematics and Physics 2017年第3期5卷 606-622页

作者： henning soller Institut für Theoretische Physik Universit&aumlt Heidelberg Heidelberg Germany

We review several recent theoretical and experimental results in the study of superconductor hybrids. This includes the recent experimental advances in the study of superconducting beamsplitters as well as more advanced superconductor hybrid systems including ferromagnets or Majorana fermions. In the same manner, theoretical studies have revealed that such superconductor hybrid systems pave the way towards electronic generation and detection of entanglement as well as possible use cases in quantum computing. We will review the aspects in detail and illustrate the possible next steps to be taken.

关键词： Superconductor Hybrids Superconducting Beamsplitter Full Counting Statistics Nanoelectronics Superconductors

Balanced Min Cost Flow on Skew Symmetric Networks with Convex Costs

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Open Journal of Discrete Mathematics 2013年第3期3卷 155-161页

作者： henning soller Institut für Theoretische Physik Heidelberg Germany

We consider the solution of matching problems with a convex cost function via a network flow algorithm. We review the general mapping between matching problems and flow problems on skew symmetric networks and revisit several results on optimality of network flows. We use these results to derive a balanced capacity scaling algorithm for matching problems with a linear cost function. The latter is later generalized to a balanced capacity scaling algorithm also for a convex cost function. We prove the correctness and discuss the complexity of our solution.

关键词： Matching Skew Symmetric Network Convex Cost Function Optimization

Full Counting Statistics of Superconductor-Quantum Dot-Superconductor Contacts in the Presence of Interactions

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Open Journal of Applied Sciences 2019年第5期9卷 386-393页

作者： henning soller Institute of Theoretical Physics University of Heidelberg Heidelberg Germany

In this paper, we discuss the full counting statistics of superconducting quantum dot contacts. We discuss the effects both of phonon and onsite electronic interaction focusing on the experimentally most relevant case of strong onsite electronic interactions. We find that in general, the Josephson effect and multiple Andreev reflections in these systems are strongly suppressed due to the onsite interaction. However, in case resonant phonons are found, the effect of the onsite interaction can be overcome.

关键词： Superconductor Nanoelectronics Tunnel Junction Full Counting Statistics Quantum Dot Andreev Reflection

HG-LG Mode Conversion with Stressed 3-Mode Fibers under Polarization

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Open Journal of Applied Sciences 2012年第4期2卷 224-227页

作者： henning soller Institut für Theoretische Physik Rupprecht-Karls-Universitat HeidelbergHeidelbergGermany

We have coupled an upright HG mode into a fiber-optic waveguide and used the application of stress to generate a Laguerre-Gaussian laser mode. We have generalized previous results by McGloin et al. by using a polarized input beam, a true 3-mode fiber and by applying the stress on a stripped piece of the optical waveguide. These generalizations are necessary in order to perform quantum information experiments and obtain reliable information on the stress imposed on the optical fiber.

关键词： Mode Conversion Stress Optical Fiber Laguerre-Gaussian Laser Mode