Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 41: Poster Session IIIa
A 41.13: Poster
Thursday, March 8, 2018, 16:15–18:15, Orangerie
Quantum criticality and the Tomonaga-Luttinger liquid in one-dimensional Bose gases — Bing Yang1,2, Yang-yang Chen3, Yong-guang Zheng1,2, •Hui Sun1,2, Han-ning Dai1,2, Xi-wen Guan3, Zhen-sheng Yuan1,2, and Jian-wei Pan1,2 — 1Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, Heidelberg, Germany — 2University of Science and Technology of China, Hefei, China — 3Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, China
We experimentally investigate the quantum criticality and Tomonaga-Luttinger liquid (TLL) behavior within one-dimensional (1D) ultracold atomic gases. Based on the measured density profiles at different temperatures, the universal scaling laws of thermodynamic quantities are observed. The quantum critical regime and the relevant crossover temperatures are determined through the double-peak structure of the specific heat. In the TLL regime, we obtain the Luttinger parameter by probing sound propagation. Furthermore,a characteristic power-law behavior emerges in the measured momentum distributions of the 1D ultracold gas, confirming the existence of the TLL.