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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 胡崇德 | |
| dc.contributor.author | Chih-Yu Chen | en |
| dc.contributor.author | 陳志宇 | zh_TW |
| dc.date.accessioned | 2021-05-11T05:01:06Z | - |
| dc.date.available | 2019-07-15 | |
| dc.date.available | 2021-05-11T05:01:06Z | - |
| dc.date.copyright | 2019-07-15 | |
| dc.date.issued | 2019 | |
| dc.date.submitted | 2019-07-05 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/handle/123456789/781 | - |
| dc.description.abstract | 準粒子凝聚態在凝態物理的應用廣泛，在玻色-愛因斯坦凝聚，超導體與超流體中扮演重要角色。本論文主要分為兩部分，第二至第六章討論二維半導體中激子（exciton）的凝聚態，研究顯示一種新的混合態波函數為二維半導體激子凝聚態的基態，並提供可能的實驗量測方式。
第七至第十章研究磁振子（magnon）的凝聚態，組織現有的Schwinger-boson平均場理論，應用於氧化銅材料，以及討論動量非零之玻色-愛因斯坦凝聚態之物理意義與氧化銅中commensurate-incommensurate相變生成之可能之微觀機制。 | zh_TW |
| dc.description.abstract | In this thesis, we study the aspects of quasiparticle condensate phenomena. The Bose-Einstein condensation of quasiparticle plays an important role in many areas such as the superconductivity, superfluidity, magnons, polaritons, and of course, one of the main topic of this thesis-exciton. The exciton condensation of two-dimensional (2D) semiconductors is reports in Ch. 2-6. We start from an effective Hamiltonian of 2D semiconductors and show an interesting mixed state of exciton condensate.
The bosonization of electrons can also be a useful mathematical tool to study quantum spin systems. In Ch. 7-10, we extend the Schwinger boson mean field theory (SBMFT) method of ferromagnetic and antiferromagnetic systems. The condensation of Schwinger bosons can describe the ordering phase of spins. We study the commensurate-incommensurate phase transition of CuO as an example. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-11T05:01:06Z (GMT). No. of bitstreams: 1 ntu-108-D99222003-1.pdf: 2284569 bytes, checksum: 24f6311b408b485ceda10f68ddd48a2a (MD5) Previous issue date: 2019 | en |
| dc.description.tableofcontents | 1 Exordium................... 5
2 Introduction of Exciton Condensate................... 9 3 Effective Hamiltonian of 2D Semiconductors.................. 11 3.1 The effective Hamiltonian without external field.............. 11 3.2 The effective Hamiltonian with external field................. 13 4 Coulomb Interaction Revisit................... 15 4.1 Spin selection rule and 2D Coulomb potential.................. 15 4.2 The form factors of cases with and without external field..... 17 5 The Gap Equation and Its Solution................... 21 5.1 Gap equation ........................... 21 5.2 Solution of gap equation................... 22 5.2.1 Numerical solutions................... 23 5.2.2 Approximate form of solutions.................... 25 6 Proposed Experiment................... 29 6.1 Luminal properties of exciton condensation................... 30 6.2 Midgap states of exciton condensation ................... 31 7 Introduction of Magnon Condensate in CuO................... 35 8 Formulation of SBMFT................... 37 8.1 Spin rotation ........................... 37 8.2 Schwinger boson mean field theory .............. 38 8.3 Free energy and SB equations.................. 42 9 Application of SBMFT to CuO...................45 9.1 The information of CuO..................... 45 9.2 Finite momentum BEC of magnon............... 48 9.3 The spin correlation function................... 49 10 The c-ic Phase Transition of CuO............. 53 11 Conclusion......... 57 | |
| dc.language.iso | en | |
| dc.subject | 孤立子 | zh_TW |
| dc.subject | 激子 | zh_TW |
| dc.subject | 二維半導體 | zh_TW |
| dc.subject | 玻色-愛因斯坦凝聚 | zh_TW |
| dc.subject | 氧化銅 | zh_TW |
| dc.subject | 磁振子 | zh_TW |
| dc.subject | 自旋 | zh_TW |
| dc.subject | exciton | en |
| dc.subject | soliton | en |
| dc.subject | commensurate-incommensurate phase transition | en |
| dc.subject | magnon | en |
| dc.subject | CuO | en |
| dc.subject | Bose-Einstein condensation | en |
| dc.subject | 2D semiconductor | en |
| dc.title | 準粒子凝聚態在二維系統與自旋有序之應用 | zh_TW |
| dc.title | Quasi-particle Condensation in Two-Dimensional System and Its Application in Spin Ordering | en |
| dc.date.schoolyear | 107-2 | |
| dc.description.degree | 博士 | |
| dc.contributor.oralexamcommittee | 張慶瑞,林育中,程思誠,陳繩義 | |
| dc.subject.keyword | 激子,二維半導體,玻色-愛因斯坦凝聚,氧化銅,磁振子,自旋,孤立子, | zh_TW |
| dc.subject.keyword | exciton,2D semiconductor,Bose-Einstein condensation,CuO,magnon,commensurate-incommensurate phase transition,soliton, | en |
| dc.relation.page | 62 | |
| dc.identifier.doi | 10.6342/NTU201901151 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2019-07-05 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 物理學研究所 | zh_TW |
| 顯示於系所單位： | 物理學系 | |
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