Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 65: Quantum-Critical Phenomena II
TT 65.6: Vortrag
Mittwoch, 14. März 2018, 16:15–16:30, HFT-FT 131
Dimensional Corssover in a Bosonic Quantum Gas — •Dominik Strassel1,2, Denis Morath1, Polina Matveeva1, Imke Schneider1, Axel Pelster1, and Sebastian Eggert1 — 1Department of Physics and Research Center Optimas, University Kaiserslautern, 67663 Kaiserslautern, Germany — 2Competence Center for High Performance Computing, Fraunhofer ITWM, 67663 Kaiserslautern, Germany
The emergence of new properties from low-dimensional building blocks is a universal theme in different areas in physics. Considering a 1D–3D transition, for instance, it is far from obvious if the power laws from the underlying 1D theory can predict the critical transition temperature, when it increases from zero as a function of inter-chain hopping [1]. Our model is represented by 1D tubes with hopping between them, which can be simulated in experiments with the help of optical lattices [2]. Combining large-scale Quantum Monte-Carlo simulations – using a canonical measurement – with analytical chain mean-field calculations and an effective potential approach to calculate the Landau potential, we show that the behavior of the critical ordering temperature as a function of the inter-chain hopping does not follow a universal power law of the known universality classes for fixed dimensions, but the exponents that we found can be interpreted as a novel type of scaling behavior.
B. Irsigler and A. Pelster, Phys. Rev. A 95, 043610 (2017)
A.Vogler, R. Labouvie, G. Barotini, S.Eggert, V. Guarrera, and H. Ott, Phys. Rev. Lett. 113, 215301 (2014)