By Rolf Haug
The 2007 Spring assembly of the Arbeitskreis Festkörperphysik used to be held in Regensburg, Germany, among March 26 and March 30 2007 along with the 71st Annual assembly of the Deutsche Physikalische Gesellschaft. This year's assembly used to be one in every of the most important physics conferences in Europe.
The current quantity forty seven of the Advances in stable nation Physics includes the written model of a big variety of the invited talks and offers an summary of the current prestige of stable country physics the place low-dimensional platforms reminiscent of quantum dots and quantum wires are dominating. the significance of magnetic fabrics and the current day curiosity into magnetism is mirrored by way of the massive variety of contributions to the half facing ferromagnetic motion pictures and debris. probably the most intriguing achievements of the final couple of years is the winning program of electric contacts and the research of a unmarried layer of graphene. This intriguing physics is roofed partially IV of this publication. Terahertz physics is one other swiftly relocating box that's provided right here via 5 contributions. Achievements in stable kingdom physics are just hardly ever attainable and not using a thorough wisdom of fabric physics. hence, the final components of this ebook conceal fabric aspects.
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Additional info for Advances Solid State Physics, Vol. 47 (2008)(en)(364s)
The absence of both TM modes and higher TE modes can be explained with their weaker conﬁnement inside the tube wall and, consequentially, with their higher susceptibility to imperfections of the waveguide surface, especially to the stricture . Figure 4a shows TE spectra obtained for diﬀerent positions of the exciting laser on the microtube axis. Here, z = 0 is somewhere in the middle of the self-supporting tube. The distance between two adjacent positions on the sample is less than 1 μm. The PL intensity is encoded in a gray scale, where dark means high intensity.
5 μm diameter pillar (intensity encoded in a logarithmic gray scale). Examples of calculated transverse electric-ﬁeld patterns of the indicated modes are shown on top. (c) Corresponding μ-PL spectrum (solid line) and calculated pillar modes (dotted line) (calculation with background absorption). (d) to (g) μ-PL spectra (solid line) and calculated modes (dotted line, without background absorption) of pillars with decreasing diameter. After  The ability of the cavity to conﬁne the light is described by the quality factor which is deﬁned as Q=λc /Δλc with λc being the peak wavelength and Δλc being the FWHM of the resonance.
2 μm for diﬀerent temperatures. 2 μm pillar shown in (a) for diﬀerent temperatures. FM of the pillars exhibits a clearly faster but nonexponential decay dynamics. A quite satisfying agreement with the experimental transients is obtained by using a biexponential decay. 7 μm pillar (Fig. 5a). As summarized in Fig. 5b, the determined fast decay component (boxes) becomes systematically shorter when going to smaller pillar diameters. The slow decay component being in the range of 600–950 ps (±50 ps) shows only a weak correlation to the pillar diameter (more details ), its origin is unclear up to now.