4,085 research outputs found
Unconventional superconductivity in a doped quantum spin Hall insulator
A monolayer of jacutingaite (PtHgSe) has recently been identified as
a novel quantum spin Hall insulator. By first-principles calculations, we study
its Fermiology in the doped regime and unveil a type-I and type-II van Hove
singularity for hole and electron doping, respectively. We find that the common
link between the propensity for a topological band gap at pristine filling and
unconventional superconductivity at finite doping roots in the longer ranged
hybridization integrals on the honeycomb lattice. In a combined effort of
random phase approximation and functional renormalization group, we find chiral
-wave order for the type-I and odd-parity -wave order for the type-II
regime.Comment: 5 pages, 4 figures, Supplemental Materia
Substrate-supported triplet superconductivity in Dirac semimetals
Stimulated by the success of graphene and its emerging Dirac physics, the
quest for versatile and tunable electronic properties in atomically thin
systems has led to the discovery of various chemical classes of 2D compounds.
In particular, honeycomb lattices of group-IV elements, such as silicene and
germanene, have been found experimentally. Whether it is a necessity of
synthesis or a desired feature for application purposes, most 2D materials
demand a supporting substrate. In this work, we highlight the constructive
impact of substrates to enable the realization of exotic electronic quantum
states of matter, where the buckling emerges as the decisive material parameter
adjustable by the substrate. At the example of germanene deposited on MoS,
we find that the coupling between the monolayer and the substrate, together
with the buckled hexagonal geometry, conspire to provide a highly suited
scenario for unconventional triplet superconductivity upon adatom-assisted
doping.Comment: 11 pages, 8 figure
Ortsbezogene Anwendungen und Dienste: 9. Fachgespräch der GI/ITG-Fachgruppe Kommunikation und Verteilte Systeme ; 13. & 14. September 2012
Der Aufenthaltsort eines mobilen Benutzers stellt eine wichtige Information für Anwendungen aus den Bereichen Mobile Computing, Wearable Computing oder Ubiquitous Computing dar. Ist ein mobiles Endgerät in der Lage, die aktuelle Position des Benutzers zu bestimmen, kann diese Information von der Anwendung berücksichtigt werden -- man spricht dabei allgemein von ortsbezogenen Anwendungen. Eng verknüpft mit dem Begriff der ortsbezogenen Anwendung ist der Begriff des ortsbezogenen Dienstes. Hierbei handelt es sich beispielsweise um einen Dienst, der Informationen über den aktuellen Standort übermittelt. Mittlerweile werden solche Dienste kommerziell eingesetzt und erlauben etwa, dass ein Reisender ein Hotel, eine Tankstelle oder eine Apotheke in der näheren Umgebung findet. Man erwartet, nicht zuletzt durch die Einführung von LTE, ein großes Potenzial ortsbezogener Anwendungen für die Zukunft.
Das jährlich stattfindende Fachgespräch "Ortsbezogene Anwendungen und Dienste" der GI/ITG-Fachgruppe Kommunikation und Verteilte Systeme hat sich zum Ziel gesetzt, aktuelle Entwicklungen dieses Fachgebiets in einem breiten Teilnehmerkreis aus Industrie und Wissenschaft zu diskutieren. Der vorliegende Konferenzband fasst die Ergebnisse des neunten Fachgesprächs zusammen.The location of a mobile user poses an important information for applications in the scope of Mobile Computung, Wearable Computing and Ubiquitous Computing. If a mobile device is able to determine the current location of its user, this information may be taken into account by an application. Such applications are called a location-based applications. Closely related to location-based applications are location-based services, which for example provides the user informations about his current location. Meanwhile such services are deployed commercially and enable travelers for example to find a hotel, a petrol station or a pharmacy in his vicinity. It is expected, not least because of the introduction of LTE, a great potential of locations-based applications in the future.
The annual technical meeting "Location-based Applications and Services" of the GI/ITG specialized group "Communication and Dsitributed Systems" targets to discuss current evolutions in a broad group of participants assembling of industrial representatives and scientists. The present proceedings summarizes the result of the 9th annual meeting
Identifying and Modelling Complex Workflow Requirements in Web Applications
Workflow plays a major role in nowadays business and therefore its
requirement elicitation must be accurate and clear for achieving the solution
closest to business’s needs. Due to Web applications popularity, the Web is becoming
the standard platform for implementing business workflows. In this
context, Web applications and their workflows must be adapted to market demands
in such a way that time and effort are minimize. As they get more popular,
they must give support to different functional requirements but also they
contain tangled and scattered behaviour. In this work we present a model-driven
approach for modelling workflows using a Domain Specific Language for Web
application requirement called WebSpec. We present an extension to WebSpec
based on Pattern Specifications for modelling crosscutting workflow requirements
identifying tangled and scattered behaviour and reducing inconsistencies
early in the cycle
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