Excited states in bilayer graphene quantum dots

We report on ground- and excited state transport through an electrostatically defined few-hole quantum dot in bilayer graphene in both parallel and perpendicular applied magnetic fields. A remarkably clear level scheme for the two-particle spectra is found by analyzing finite bias spectroscopy data within a two-particle model including spin and valley degrees of freedom. We identify the two-hole ground-state to be a spin-triplet and valley-singlet state. This spin alignment can be seen as Hund's rule for a valley-degenerate system, which is fundamentally different to quantum dots in carbon nano tubes and GaAs-based quantum dots. The spin-singlet excited states are found to be valley-triplet states by tilting the magnetic field with respect to the sample plane. We quantify the exchange energy to be 0.35meV and measure a valley and spin g-factor of 36 and 2, respectively

Spin-photon interface and spin-controlled photon switching in a nanobeam waveguide

Access to the electron spin is at the heart of many protocols for integrated and distributed quantum-information processing [1-4]. For instance, interfacing the spin-state of an electron and a photon can be utilized to perform quantum gates between photons [2,5] or to entangle remote spin states [6-9]. Ultimately, a quantum network of entangled spins constitutes a new paradigm in quantum optics [1]. Towards this goal, an integrated spin-photon interface would be a major leap forward. Here we demonstrate an efficient and optically programmable interface between the spin of an electron in a quantum dot and photons in a nanophotonic waveguide. The spin can be deterministically prepared with a fidelity of 96\%. Subsequently the system is used to implement a "single-spin photonic switch", where the spin state of the electron directs the flow of photons through the waveguide. The spin-photon interface may enable on-chip photon-photon gates [2], single-photon transistors [10], and efficient photonic cluster state generation [11]

Protected areas: A focus on Brazilian freshwater biodiversity

Brazil has a variety of aquatic ecosystems and rich freshwater biodiversity, but these components have been constantly damaged by the expansion of unsustainable activities. An array of different conservation strategies is needed, especially the creation of protected areas (PAs, hereafter). However, Brazil's PAs are biased towards terrestrial ecosystems and we argue that current PAs have limited efficacy in the protection of freshwater biodiversity. New PAs should better consider aquatic environments, covering entire basins, rivers and other freshwater habitats. We recommend ways to implement these PAs and provide guidance to avoid social impacts. Freshwater systems in Brazil provide essential goods and services but these ecosystems are being rapidly degraded and will be lost if not adequately protected. © 2018 The Authors. Diversity and Distributions Published by John Wiley & Sons Lt

Inkjet-Printed Capacitive Sensors and Electronic Structures

Příspěvek shrnuje aktivity výzkumné společnosti PROFACTOR v oblasti inkoustového tisku kapacitních senzorů a jejich využití při ovládání robota člověkem či jako senzor hladiny tekutiny vytištěný přímo na 3D objektu. Diskutovány jsou procesy a techniky tisku a funkčnost senzorů je prokázána na několika demonstrátorech, zejména na robotickém rameni vybaveném tištěnými kapacitními dotykovými tlačítky a na skleněné váze s tištěnými kapacitními senzory na jedné straně a signalizací hladiny vody pomocí LED na druhé straně.The paper summarizes activities of the research company PROFACTOR in the field of functional inkjet printing of capacitive sensors and their usage as a human to robot interface and as a fluid level sensor directly printed on a 3D object. Printing processes and techniques are discussed and sensor functionality is proven on several demonstrators, namely the robotic arm equipped with printed capacitive touch buttons and a glass vase with printed capacitive level sensors on one side and LED signalization of the water level on the other side

Eine Softwareproduktionsumgebung fuer kleine und mittelstaendische Unternehmen. T. 2 Bericht zum 2. Meilenstein

SIGLEAvailable from TIB Hannover: RR 9963(42) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman