134 research outputs found
Making up meanings in a capital city: power, memory and monuments in Berlin
Much contemporary writing on cities focuses on their position within wider global networks, so there is a risk of underplaying the significance of other aspects of the urban experience.This paper explores the particular role of Berlin as capital city in the making of the (new) Berliner Republic and the ways in which it is defined (and defines itself) within that Republic. Berlin is the (and often literally the building) site on which a new Germany is being constructed. The making up of the new Berlin is dominated by attempts to reinterpret and reimagine its history: it is a city of memorials and of deliberate absences; of remembering and forgetting, or trying to forget; of reshaping the past as well as trying to build a new future. The juxtapositions of urban experience, the layering of memories and the attempt to imagine a different future come together to define Berlin as a contemporary capital city
Statistical investigations on nitrogen-vacancy center creation
Quantum information technologies require networks of interacting defect bits. Color centers,
especially the nitrogen vacancy (NV-) center in diamond, represent one promising avenue, toward
the realisation of such devices. The most successful technique for creating NV- in diamond is ion
implantation followed by annealing. Previous experiments have shown that shallow nitrogen
implantation (<10 keV) results in NV- centers with a yield of 0.01%â0.1%. We investigate the
influence of channeling effects during shallow implantation and statistical diffusion of vacancies
using molecular dynamics and Monte Carlo simulation techniques. Energy barriers for the
diffusion process were calculated using density functional theory. Our simulations show that 25%
of the implanted nitrogens form a NV center, which is in good agreement with our experimental
findings
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