Magnetotransport Properties and Subband Structure of the Two-Dimensional Electron Gas in the Inversion Layer of Hg1-xCdxTe Bicrystals

The electronic and magnetotransport properties of conduction electrons in the grain boundary interface of p-type Hg1-xCdxTe bicrystals are investigated. The results clearly demonstrate the existence of a two-dimensional degenerate n-type inversion layer in the vicinity of the grain boundary. The observed quantum oscillations of the magnetoresistivity result from a superposition of the Shubnikov-de Haas effect in several occupied electric subbands. The occupation of higher subbands is presumable depending on the total carrier density ns of the inversion layer. Electron densities, subband energies, and effective masses of these electric subbands in samples with different total densities are determined. The effective masses of lower subbands are markedly different from the band edge values of the bulk material, their values decrease with decreasing electron density and converging to the bulk values at lower densities. This agrees with predictions of the triangular potential well model and a pronounced nonparabolicity of the energy bands in Hg1-xCdxTe. At high magnetic fields (B > 10 T) it is experimentally verified that the Hall resistivity xy is quantized into integer multiplies of h/e2

Classification and Characterization of rationally elliptic manifolds in low dimensions

We give a characterization of closed, simply connected, rationally elliptic 6-manifolds in terms of their rational cohomology rings and a partial classification of their real cohomology rings. We classify rational, real and complex homotopy types of closed, simply connected, rationally elliptic 7-manifolds. We give partial results in dimensions 8 and 9.Comment: 23 pages; extended Section 2, revised Section 5 and several minor revision

Hilltops and Marches: A Cultural and Semiotic Analysis of Pepsi and Coca-Cola Advertising Strategies

The Coca-Cola Company released an advertisement in 1971 that had powerful themes of unity in a time of significant discord around the world. Almost 50 years later, the Pepsi Company released an advertisement that aimed to accomplish similar values of unity and commonality when the world seemed at odds with itself. While both advertisements sought to convey similar messages, the reception could not have been more different. Coca-Cola has experienced continued praise for their famous “Hilltop” advertisement while Pepsi was forced to take their advertisement down within 24 hours of its release. This paper utilizes semiotic theory to analyze the signs in the advertisements to create an understanding of how each advertisement was perceived differently. In order to understand a semiotic approach, this paper also approaches semiotics with respect to the historical contexts surrounding both advertisements

Squark and gaugino hadroproduction and decays in non-minimal flavour violating supersymmetry

We implement non-minimal flavour violation (NMFV) in the MSSM at low scale. In this framework, we propose benchmark points for the mSUGRA scenario including non-minimal flavour violation by evaluating a number of experimental low-energy, electroweak precision and cosmological constraints. We finally discuss phenomenological aspects of our NMFV scenario and present a numerical analysis of squark and gaugino production cross sections at the LHC.Comment: Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 18 eps figures, typos and references correcte