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標題: | 準一維帶自旋玻色氣體實驗之建構 Experiments toward realizing a quasi-1D spinor bose gas |
作者: | Wen-Chen Lin 林玟辰 |
指導教授: | 林俊達(Guin-Dar Lin) |
關鍵字: | 冷原子,玻色愛因斯坦凝結,二維光晶格,一維玻色氣體,帶自旋玻色氣體, Spinor bose gas,Bose-Einstein condensate,1D bose gas,2D optical lattice,Tonks-Girardeau gas, |
出版年 : | 2015 |
學位: | 碩士 |
摘要: | 強關聯系統可由一維空間下帶有交互作用的粒子形成。若能引入自
旋操控的技術,就可以探討帶自旋的強關聯系統。在這篇論文中,我 將會介紹我們在一維空間下,對於強交互作用之帶自旋玻色氣體的研 究進展。我們首先在交叉光阱中製造銣原子玻色愛因斯坦凝結(BEC)。 過程中,我們利用外加磁場和微波來調整銣原子的自旋態。接著,我 們將BEC 轉移到二維光晶格中並且觀察到二維超流體與莫特絕原體之 間的相變。另一方面,我們的二維光晶格本身是由許多一維位能井組 成的陣列,因此我們利用二維光晶格來產生一維位能井。在目前架設 的一維位能井中,我們透過量測三體碰撞損失率,來觀察到由粒子交 互作用造成的三體關聯性(three-body correlation) 降低。我們目前的玻色氣體處於弱交互作用區間,但已經很接近我們想達到的強交互作用 區間。 A strongly correlated system can be constructed by interacting quantum particles confined in one dimension. Including a spin manipulating technique, one can investigate spin dynamics of such system. In this thesis, I will present our experimental efforts toward studying the quantum dynamics of strongly interacting quasi-1D spinor Bose gas. In our experiment, we produced a rubidium Bose-Einstein condensate (BEC) in a crossed optical dipole trap (XODT), and tailored the spin population of the condensate by applying external magnetic fields and microwaves. Following that the condensate was further loaded into a 2D optical lattice, and the quantum phase transition between superfluid and insulator phases was observed.On the other hand, the 2D optical lattice is an array of quasi-1D tubular potentials, so we formed quasi-1D potentials by means of a 2D optical lattice. In the present quasi-1D potential tubes, the suppression of three body correlation due to interaction has been observed by measuring the 3-body loss rates. Thus far, our bose gas is in the Thomas-Fermi (weakly interacting) regime and is reaching to a Tonks Girardeau regime. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/4456 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 物理學系 |
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ntu-104-1.pdf | 4.49 MB | Adobe PDF | 檢視/開啟 |
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