In: Physical Review B, 2010, vol. 81, no. 1, p. 012303
We study the dynamical response of a system to a sudden change of the tuning parameter λ starting (or ending) at the quantum critical point. In particular, we analyze the scaling of the excitation probability, number of excited quasiparticles, heat and entropy with the quench amplitude, and the system size. We extend the analysis to quenches with arbitrary power law dependence on time of the...
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In: Physical Review A, 2009, vol. 80, p. 033604
We investigate theoretically the evolution of the two-point density correlation function of a low-dimensional ultracold Bose gas after release from a tight transverse confinement. In the course of expansion thermal and quantum fluctuations present in the trapped systems transform into density fluctuations. For the case of free ballistic expansion relevant to current experiments, we present simple...
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In: Applied Radiation and Isotopes, 2008, vol. 66, no. 6-7, p. 737-741
After the nuclear reactor accident of Chernobyl, the “Integrated Measurement and Information System (IMIS) for Monitoring the Environmental Radioactivity and Detecting Emissions from Nuclear Plants was implemented in Germany. IMIS is a nationwide comprehensive measuring system which permanently monitors the radioactivity in all important environment media in the whole federal territory. At...
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In: Physical Review B, 2004, vol. 69, p. 115327
On the basis of energy calculations we investigate the competition between quantum-liquid and electron-solid phases in the Landau levels n = 1, 2, and 3 as a function of their partial filling factor ̅ν̅. Whereas the quantum-liquid phases are stable only in the vicinity of quantized values of ν̅= 1/(2s + 1), an electron solid in the form of a triangular lattice of clusters with...
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