Exploration of novel quantum phases in multi-component ultracold atomic gases

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287104
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: NTT Basic Research Laboratories
• Principal Investigator: Yamashita Makoto 日本電信電話株式会社NTT物性科学基礎研究所, 量子光物性研究部, 主任研究員 (00393786)
• Co-Investigator(Kenkyū-buntansha): MUKAI Tetsuya 日本電信電話株式会社NTT物性科学基礎研究所, 量子光物性研究部, 主任研究員 (70393775) ; INABA Kensuke 日本電信電話株式会社NTT物性科学基礎研究所, 量子光物性研究部, 研究主任 (10564990) ; IMAI Hiromitsu 日本電信電話株式会社NTT物性科学基礎研究所, 量子光物性研究部, 研究員 (00649551) ; SUGA Sei-ichiro 兵庫県立大学, 大学院工学研究科, 教授 (40206389) ; SUZUKI Takafumi 兵庫県立大学, 大学院工学研究科, 准教授 (40444096) ; TSUCHIURA Hiroki 東北大学, 大学院工学研究科, 准教授 (30374961) ; TOGA Yuta 国立研究開発法人物質・材料研究機構, 元素戦略磁性材料研究拠点, 研究員 (70641231)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 冷却原子気体 / 光格子 / 量子物性 / スピン / 超流動 / アトムチップ / 超伝導 / 擬一次元

Outline of Final Research Achievements

We explore the novel quantum phases in ultracold atomic gases with the spin degrees of freedom, forming the typical many-body multi-component systems in optical lattices. We have theoretically clarified that Cooper-pairing symmetry of a fermionic superfluid and the dynamical instability of a bosonic superfluid greatly change via the subtle balance in the interactions between the atomic components. We consider such a role of interactions to be a possible origin of diverse quantum phases found in these multi-component systems. On the other hand, we have experimentally created quasi-one-dimensional Bose-Einstein condensates with high density on a persistent-supercurrent atom chip. We observe that the momentum distribution of condensates becomes fragile owing to the quantum fluctuations inherent in this low-dimensional system. We furthermore develop the experimental techniques for controlling atomic spins on an atom chip and then realize the multi-component condensates.

Free Research Field

原子・分子・量子エレクトロニクス