2017年第78回応用物理学会秋季学術講演会

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一般セッション(口頭講演)

4 JSAP-OSA Joint Symposia 2017 » 4.9 Quantum Optics

[7p-A410-1~9] 4.9 Quantum Optics

2017年9月7日(木) 13:15 〜 16:45 A410 (410)

平野 琢也(学習院大)、サッドグローブ マーク(東北大)

16:00 〜 16:15

[7p-A410-7] Observation of self-organized coherence in dissipative spinor Bose-Einstein condensates

Yujiro Eto1、Hitoshi Shibayama2、Aki Torii2、Hiroki Saito3、Takuya Hirano2 (1.AIST、2.Gakushuin Univ.、3.Univ. Electro.-Comm.)

キーワード:Bose-Einstein condensate, Spinor dynamics, Dissipation

Dissipation is a ubiquitous phenomenon, and it is important to understand its role in non-equilibrium dynamics. In the quantum systems, dissipation often reduce the coherence of the quantum states. But sometimes, it induces completely different effects than the decoherence. For example, strong dissipation can be used to suppress the loss and control the quantum state and quantum phase transition. Here, we have observed novel spinor dynamics caused by strong dissipation in quantum atomic gas. We have observed spontaneous magnetization with self-organized coherence in spin-2 Bose-Einstein condensates (BECs). It should be noted that spin-2 BEC of 87Rb favors the non-ferromagnetic nature due to spin-dependent elastic collision, and they are dissipative system due to large hyperfine exchange loss. These properties seemingly contradict the spontaneous magnetization and formation of coherence. We have found that these nontrivial effects are mainly due to the hyperfine changing inelastic loss, which wants to leave the ferromagnetic spins.