發(fā)布時間：2018-04-19 22:27

  本文選題：窄Feshbach共振 + 超冷費米氣體��； 參考：《華東師范大學》2017年碩士論文

【摘要】：隨著激光冷卻技術的發(fā)展,超冷費米氣體已逐漸成為當前原子分子物理學的研究熱點。光學誘導和磁場可控的Feshbach共振技術可以精確調控原子間的相互作用,廣泛用于研究分子的玻色-愛因斯坦凝聚和費米原子的BCS共振超流。本論文研制了一套大磁場強度、可快速變化的精密磁場控制系統(tǒng),該系統(tǒng)可以實現(xiàn)1200高斯的微秒量級快速穩(wěn)定控制,磁場穩(wěn)定度優(yōu)于10毫高斯。利用這套精密的磁場控制系統(tǒng),通過對6Li費米氣體采用塞曼減速、磁光阱冷卻、偶極阱俘獲和蒸發(fā)冷卻等冷卻方法實現(xiàn)了 6Li原子氣體的量子簡并和6Li2分子的玻色愛因斯坦凝聚。本論文還觀測了 6Li原子最低能態(tài)的窄Feshbach共振,發(fā)現(xiàn)其共振點在543.278 G附近,與理論計算結果相一致,為將來研究窄Feshbach共振強相互作用提供重要的依據(jù)。同時證實了窄Feshbach共振區(qū)域原子間相互作用強度的能量依靠關系,研究了窄Feshbach共振區(qū)域的RF躍遷頻率偏移現(xiàn)象,對Feshbach共振磁場的研制以及6Li窄Feshbach共振的進一步研究有一定的指導意義。
[Abstract]:With the development of laser cooling technology, supercooled Fermi gas has gradually become a hot spot in atomic and molecular physics. The optically induced and magnetic field controllable Feshbach resonance technique can accurately regulate the interaction between atoms. It is widely used to study the Bose-Einstein condensation of molecules and the BCS resonance supercurrent of Fermi atoms. In this paper, a set of precision magnetic field control system with large magnetic field intensity and rapid variation has been developed. The system can realize 1200 Gao Si's microsecond order of rapid and stable control, and the magnetic field stability is better than 10 mm Gao Si. Using this precise magnetic field control system, the 6Li Fermi gas is cooled by Zeeman deceleration and magneto-optic trap cooling. The quantum degeneracy of 6Li atom gas and the Bose-Einstein condensation of 6Li2 molecule are realized by dipole trap capture and evaporative cooling. In this paper, the narrow Feshbach resonance of the lowest energy state of the 6Li atom is observed. It is found that the resonance point is near 543.278 G, which is consistent with the theoretical results, which provides an important basis for the study of the strong interaction of the narrow Feshbach resonance in the future. At the same time, the energy dependence relation of the intensity of the interaction between atoms in the narrow Feshbach resonance region is confirmed, and the phenomenon of RF transition frequency migration in the narrow Feshbach resonance region is studied. It has certain guiding significance for the development of Feshbach resonance magnetic field and the further study of 6Li narrow Feshbach resonance.
【學位授予單位】：華東師范大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：O562

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本文編號：1775030