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

【摘要】：隨著激光冷卻技術(shù)的發(fā)展,超冷費(fèi)米氣體已逐漸成為當(dāng)前原子分子物理學(xué)的研究熱點(diǎn)。光學(xué)誘導(dǎo)和磁場(chǎng)可控的Feshbach共振技術(shù)可以精確調(diào)控原子間的相互作用,廣泛用于研究分子的玻色-愛(ài)因斯坦凝聚和費(fèi)米原子的BCS共振超流。本論文研制了一套大磁場(chǎng)強(qiáng)度、可快速變化的精密磁場(chǎng)控制系統(tǒng),該系統(tǒng)可以實(shí)現(xiàn)1200高斯的微秒量級(jí)快速穩(wěn)定控制,磁場(chǎng)穩(wěn)定度優(yōu)于10毫高斯。利用這套精密的磁場(chǎng)控制系統(tǒng),通過(guò)對(duì)6Li費(fèi)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(shí)現(xiàn)了 6Li原子氣體的量子簡(jiǎn)并和6Li2分子的玻色愛(ài)因斯坦凝聚。本論文還觀測(cè)了 6Li原子最低能態(tài)的窄Feshbach共振,發(fā)現(xiàn)其共振點(diǎn)在543.278 G附近,與理論計(jì)算結(jié)果相一致,為將來(lái)研究窄Feshbach共振強(qiáng)相互作用提供重要的依據(jù)。同時(shí)證實(shí)了窄Feshbach共振區(qū)域原子間相互作用強(qiáng)度的能量依靠關(guān)系,研究了窄Feshbach共振區(qū)域的RF躍遷頻率偏移現(xiàn)象,對(duì)Feshbach共振磁場(chǎng)的研制以及6Li窄Feshbach共振的進(jìn)一步研究有一定的指導(dǎo)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(xué)位授予單位】：華東師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O562

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