本文選題：非共振泵浦　切入點(diǎn)：激子極化激元　出處：《吉林大學(xué)》2017年碩士論文

【摘要】：激子極化激元是半導(dǎo)體激子和微腔光子強(qiáng)耦合而形成的一種新的具有玻色子特性的準(zhǔn)粒子。由于其小的有效質(zhì)量和強(qiáng)的相互作用,理論上,可以在標(biāo)準(zhǔn)低溫甚至室溫下達(dá)到玻色愛因斯坦凝聚(BEC)。它不僅給基礎(chǔ)研究帶來新的研究課題,同時(shí)在未來量子器件的開發(fā)、應(yīng)用方面具有廣泛的前景,成為當(dāng)前低溫物理和凝聚態(tài)物理研究的熱門話題之一。本文針對半導(dǎo)體微腔系統(tǒng),研究了非共振均勻泵浦條件下激子極化激元玻色愛因斯坦凝聚中耗散孤子的存在條件及其物理性質(zhì)。論文主要分為三個(gè)部分,具體內(nèi)容如下:第一部分:簡單介紹了激子極化激元的研究進(jìn)展、玻色愛因斯坦凝聚中的物質(zhì)波孤子以及激子極化激元凝聚中孤子的研究現(xiàn)狀。第二部分:詳細(xì)闡述了半導(dǎo)體微腔的結(jié)構(gòu)及激子、激子極化激元的基本理論以及激子極化激元玻色愛因斯坦凝聚的形成過程及其性質(zhì)。第三部分:首先分析了非共振均勻泵浦條件下激子極化激元玻色愛因斯坦凝聚及其穩(wěn)定性條件,在此基礎(chǔ)上,研究了凝聚體系統(tǒng)中出現(xiàn)耗散孤子的條件及特點(diǎn)。通過數(shù)值模擬,我們發(fā)現(xiàn)系統(tǒng)中穩(wěn)態(tài)暗孤子的存在。在一定條件下,它能夠自發(fā)的產(chǎn)生,并且持續(xù)很長時(shí)間。但由于耗散的存在,暗孤子還表現(xiàn)出了振蕩、破裂、猝滅等特性。其次,我們研究了激子極化激元的損耗C?對暗孤子的影響。我們發(fā)現(xiàn),在不改變其他參數(shù)的條件下,暗孤子可以在很大的C?范圍內(nèi)存在,并且,對于不同的損耗C?出現(xiàn)孤子的泵浦范圍也不同;只有在一定的C?范圍內(nèi)才可以產(chǎn)生泵浦范圍較大、穩(wěn)定性較好、孤子壽命較長的暗孤子。最后,我們研究了泵浦邊緣的影響,發(fā)現(xiàn)在低泵浦條件下,當(dāng)參數(shù)滿足RC D C D Rgg(28)??11時(shí)會產(chǎn)生一種新的態(tài)-反暗孤子,分析表明它是由泵浦邊緣的非線性波發(fā)生干涉而形成的,并伴有些許振蕩的局域峰。可以通過對泵浦調(diào)制,我們可以獲得多個(gè)孤子。上述的研究結(jié)果,不僅有助于基礎(chǔ)領(lǐng)域的研究,而且還為其在未來量子技術(shù)的應(yīng)用提供了理論基礎(chǔ)。
[Abstract]:The exciton polariton is a new quasi-particle with boson properties which is formed by the strong coupling of semiconductor exciton and microcavity photons.Due to its small effective mass and strong interaction, the Bose-Einstein condensation can be achieved theoretically at standard low temperature or even at room temperature.It not only brings new research topics to basic research, but also has a broad prospect in the development and application of quantum devices in the future. It has become one of the hot topics in the research of cryogenic physics and condensed matter physics.In this paper, the existence conditions and physical properties of dissipative solitons in the Bose-Einstein condensate of exciton polarized excitons under the condition of non-resonant uniform pumping are studied for semiconductor microcavity systems.The thesis is divided into three parts. The main contents are as follows: in the first part, the research progress of exciton polarization, the matter wave soliton in Bose-Einstein condensate and the soliton in exciton polarization condensation are briefly introduced.In the second part, the structure and exciton of semiconductor microcavity, the basic theory of exciton polarization and the formation process and properties of exciton polarimetric Bose-Einstein condensate are described in detail.In the third part, the conditions of Bose-Einstein condensation and its stability for exciton polarization excitons under non-resonant uniform pumping conditions are analyzed. On this basis, the conditions and characteristics of dissipative solitons in the condensate system are studied.By numerical simulation, we find the existence of steady-state dark solitons in the system.Under certain conditions, it can spontaneously produce and last for a long time.However, due to the existence of dissipation, dark solitons also exhibit the characteristics of oscillation, rupture and quenching.Secondly, we study the loss of exciton polarization excitons.The effect on dark solitons.We find that dark solitons can be found in large C3 without changing other parameters.Within range, and for different loss C?The pump range of solitons is also different; only at a certain C?Dark solitons with larger pumping range, better stability and longer lifetime can be produced within the range.Finally, we study the effect of pump edge. We find that a new state-inverse dark soliton can be produced when the parameters satisfy the RC-D D rgg28- 11:00 condition. The analysis shows that it is formed by the interference of nonlinear waves at the pump edge.A localized peak accompanied by a slight oscillation.We can obtain multiple solitons by pump modulation.The above results not only contribute to the study of the fundamental field, but also provide a theoretical basis for its application in the future quantum technology.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O469

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本文編號：1692428