# Regensburg 2019 – wissenschaftliches Programm

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# TT: Fachverband Tiefe Temperaturen

## TT 30: Correlated Electrons: 1D Theory

### TT 30.3: Vortrag

### Dienstag, 2. April 2019, 14:30–14:45, H4

**Dimensional phase transitions from 1D quantum liquids to 3D condensates** — •Polina Matveeva^{1}, Imke Schneider^{1}, Sebastian Eggert^{1}, Axel Pelster^{1}, Denis Morath^{1}, and Dominik Straßel^{1,2} — ^{1}Technical University of Kaiserslautern, Kaiserslautern, Germany — ^{2}Competence Center for High Performance Computing, Fraunhofer ITWM, Kaiserslautern,Germany

We consider weakly coupled strongly interacting quantum chains, such as quantum wires, anisotropic ultracold gases, or quasi-1D spin-chain compounds. It is known that a phase transition from the 1D Luttinger liquid behavior to a 3D ordered states can be qualitatively descibed by a chain mean field theory to determine the critical temperature, but the quantitative corrections and the range of validity is not well established. We therefore simulate the transition using a fully 3D microscopic model with very large scale quantum Monte Carlo calculations and compare with theoretical prediction including higher order terms in the chain mean field theory. We not only determine the very strong quantitative corrections, but also find a new regime of low density behavior where long range quantum correlations between the chains dominate the behavior, which leads qualitatively different powerlaws as a function of interchain couplings.