期刊論文
| 學年 | 90 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2002-02-01 |
| 作品名稱 | Effect of lattice fluctuations on the quantum phase transition in a one-dimensional commensurate system |
| 作品名稱（其他語言） | |
| 著者 | Zheng, H.; Zhu, S. Y.; 陳惟堯; Chen, Wei-yeu |
| 單位 | 淡江大學物理學系 |
| 出版者 | Springer |
| 著錄名稱、卷期、頁數 | European physical journal B 25(3), pp.299-306 |
| 摘要 | The effect of quantum lattice fluctuations on the properties of quantum phase transition in a one-dimensional commensurate system near and at criticality is studied. The nonadiabatic effect due to finite phonon frequency > 0 are treated through an energy-dependent electron-phonon scattering function introduced in a unitary transformation. By using the Green's function perturbation theory we have shown that our theory gives a good description of the effect of quantum lattice fluctuations: (1) At the criticality, when the coupling constant g2 decreases or the phonon frequency increases the lattice distortion and the gap in the fermionic spectrum decreases gradually; at some critical value gc2 or ( )c, the system becomes gapless and the lattice distortion disappears. (2) The calculated density of states do not have the inverse-square-root singularity but have a peak with a significant tail below the peak. (3) At the criticality our approach successfully describes the classical-quantum crossover. In the classical region the adiabatic mean-field parameters may strongly be renormalized by nonadiabatic corrections, and in the quantum region the phase transition is of the signature of a Kosterlitz-Thouless transition. (4) Away from the criticality the critical exponents for the energy gap and the ordering parameter have been calculated. |
| 關鍵字 | |
| 語言 | en |
| ISSN | 1434-6028 |
| 期刊性質 | 國外 |
| 收錄於 | |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | 否 |
| 國別 | DEU |
| 公開徵稿 | |
| 出版型式 | ,紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27482 ) |