Development of theory for non-zero temperature BEC including internal degrees of freedom and many-body effect

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K17774
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Tokyo University of Science
• Principal Investigator: WATABE Shohei 東京理科大学, 理学部第一部物理学科, 助教 (90726895)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: Bose-Einstein凝縮 / 多体効果 / 多自由度効果 / 有限温度効果

Outline of Final Research Achievements

We discussed many-body effect and effect of internal degrees of freedom on a single-particle excitation as well as a collective excitation in a Bose-Einstein condensate. We studied the correspondence between the single-particle excitation and the collective excitation at non-zero temperature, which is believed to be characteristic to the Bose-Einstein condensate, and we also found a satellite peak in the single-particle excitation originated from the multi-particle excitation in the Bose-Einstein condensate. For a multi-component Bose-Einstein condensate, we also derive the Ward-Takahashi identity in the case of explicitly broken symmetry.

Free Research Field

凝縮系物理，冷却原子気体