4,749 research outputs found
2D superconductivity with strong spin-orbit interaction
We consider superconductivity confined at a two-dimensional interface with a
strong surface spin-orbit (Rashba) interaction. Some peculiar properties of
this system are investigated. In particular, we show that an in-plane Zeeman
field can induce a supercurrent flow.Comment: latex, 1 figure in ep
Measuring current by counting electrons in a nanowire quantum dot
We measure current by counting single electrons tunneling through an InAs
nanowire quantum dot. The charge detector is realized by fabricating a quantum
point contact in close vicinity to the nanowire. The results based on electron
counting compare well to a direct measurements of the quantum dot current, when
taking the finite bandwidth of the detector into account. The ability to detect
single electrons also opens up possibilities for manipulating and detecting
individual spins in nanowire quantum dots
Properties of the energy landscape of network models for covalent glasses
We investigate the energy landscape of two dimensional network models for
covalent glasses by means of the lid algorithm. For three different particle
densities and for a range of network sizes, we exhaustively analyse many
configuration space regions enclosing deep-lying energy minima. We extract the
local densities of states and of minima, and the number of states and minima
accessible below a certain energy barrier, the 'lid'. These quantities show on
average a close to exponential growth as a function of their respective
arguments. We calculate the configurational entropy for these pockets of states
and find that the excess specific heat exhibits a peak at a critical
temperature associated with the exponential growth in the local density of
states, a feature of the specific heat also observed in real glasses at the
glass transition.Comment: RevTeX, 19 pages, 7 figure
Detecting THz current fluctuations in a quantum point contact using a nanowire quantum dot
We use a nanowire quantum dot to probe high-frequency current fluctuations in
a nearby quantum point contact. The fluctuations drive charge transitions in
the quantum dot, which are measured in real-time with single-electron detection
techniques. The quantum point contact (GaAs) and the quantum dot (InAs) are
fabricated in different material systems, which indicates that the interactions
are mediated by photons rather than phonons. The large energy scales of the
nanowire quantum dot allow radiation detection in the long-wavelength infrared
regime
Zeig doch mal! - Tipps fĂĽr die Erstellung von Lernvideos in Lege- und Zeichentechnik
In populären Erklär- und Lernvideos kommen immer wieder Zeichen- und Legetechniken zum Einsatz, bei der Bilder live gezeichnet oder Papierfiguren hineingelegt und verschoben werden, um Lerninhalte zu verdeutlichen. Populär geworden ist diese Methode durch die Videoreihe von Common Craft "in Plain English", bei der die Funktionalität unterschiedlicher sozialer Anwendungen erklärt wird. Die Autorin und der Autor schreiben in Form eines Werkstattberichtes von ihren Erfahrungen bei der Erstellung und dem Einsatz von Lernvideos in der Legetechnik und geben Empfehlungen für Nachahmer/innen.
24.04.2014 | Sandra Schön (Salzburg) & Martin Ebner (Graz
- …