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- Helmholtz-Zentrum Berlin für Materialien und EnergieDE144 papers
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5 papers · 2 filters
Ground-state phases in antiferromagnetic spin-crossover chains
Carsten Timm, Ulrich Schollwöck
Spin-crossover molecules having a low-spin ground state and a low-lying excited high-spin state are promising components for molecular electronics. We theoretically examine one-dim…
The Totally Asymmetric Simple Exclusion Process with Langmuir Kinetics
A. Parmeggiani, T. Franosch, E. Frey
We discuss a new class of driven lattice gas obtained by coupling the one-dimensional totally asymmetric simple exclusion process to Langmuir kinetics. In the limit where these dyn…
Non-universal Critical Quantities from Variational Perturbation Theory and Their Application to the BEC Temperature Shift
Boris Kastening
For an O(N) symmetric scalar field theory with Euclidean action integral d^3x [1/2 |nabla phi|^2 + 1/2 r phi^2 + 1/4! u phi^4], where phi = (phi_1,...,phi_N) is a vector of N real…
Shift of BEC Temperature of Homogenous Weakly Interacting Bose Gas
Boris Kastening
We report on the computation of the shift of the Bose-Einstein condensation temperature for a homogenous weakly interacting Bose gas in leading order in the diluteness parameter a…
Highly Accurate Critical Exponents from Self-Similar Variational Perturbation Theory
H. Kleinert, V. I. Yukalov
We extend field theoretic variational perturbation theory by self-similar approximation theory, which greatly accelerates convergence. This is illustrated by re-calculating the cri…