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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31815| 標題: | 有限溫度下的二微系統中BCS-BEC跨越之研究 Two-dimensional BCS-BEC Crossover at Finite Temperature -A Study on the D-wave Pair Susceptibility |
| 作者: | Chih-Yu Chen 陳志宇 |
| 指導教授: | 胡崇德 |
| 關鍵字: | d波,BCS-BEC跨越, d-wave,crossover,finite temperature,pair susceptibility, |
| 出版年 : | 2003 |
| 學位: | 碩士 |
| 摘要: | In this article we studied the BCS-BEC crossover in two-dimensional d-wave pairing at finite temperature. We would life to calculat the relation between condensate numbers and chemical potential and then find the energy gap in superconductors. We will discuss the attractive seperable potential and the contact (hard core) potential with d-wave form. The main diffrence between d-wave and s-wave is that the d-wave is angle dependent. It will lead to a factor of 1/2 in the perturbation expansion of the hard core potential.
We analyzed the asymptotic property of the two potentials. It is showed that the pair susceptibility will diverge for some kinds of potential. That is, some of potentials is computable in mean field theory but not in the pair susceptibility method. |
| URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31815 |
| 全文授權: | 有償授權 |
| 顯示於系所單位： | 物理學系 |
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| ntu-92-1.pdf 未授權公開取用 | 1.24 MB | Adobe PDF |
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