Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Quantum Gases: Bosons V
Q 38.1: Vortrag
Mittwoch, 8. März 2017, 14:30–14:45, P 204
Observation of Quantum Criticality and Luttinger Liquid in One-dimensional Bose Gases — •Bing Yang1,3, Yang-Yang Chen2, Yong-Guang Zheng1,3, Hui Sun1,3, Han-Ning Dai1,3, Xi-Wen Guan2,4, Zhen-Sheng Yuan1,3, and Jian-Wei Pan1,3 — 1Hefei National Laboratory for Physical Science at Microscal and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China — 2State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, Wuhan 430071, Wuhan — 3Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 4Department of Theoretical Physics, Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia
We report an observation of quantum criticality and the TLL in a system of ultracold 87Rb atoms within 1D tubes. The universal scaling laws are measured precisely and the characteristic critical temperatures are determined by the double-peak structure of specific heat, confirming the existence of three phases: classical gas, quantum critical region and the TLL. The Luttinger parameter estimated from the observed sound velocity approaches the measured Wilson ratio (WR), which reveals the collective nature of the TLL and the quantum fluctuations.