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| 題名: | Effects of a Magnetic Field on the One-dimensional Spin-orbital Model |
| 作者: | Lee, Yu-Li;Lee, Yu-Wen |
| 貢獻者: | 物理學系 |
| 日期: | 2000-03
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| 上傳時間: | 2012-09-10T06:07:34Z
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| 出版者: | The American Physical Society |
| 摘要: | We study the effects of a uniform magnetic field on the one-dimensional spin-orbital model in terms of effective field theories. Two regions are examined: one around the SU(4) point (J=K/4) and the other with K≪J [see Eq. (1)]. We found that when J<~K/4, the spin and orbital correlation functions exhibit power-law decay with nonuniversal exponents. In the region with J>K/4, the excitation spectrum has a gap but the structure of it changes at different range of the ratio J/K. Furthermore, near the SU(4) point, the magnetic field exerts a great influence on the spectrum of the Sz=0 sector. When the magnetic field is beyond some critical value, a quantum phase transition occurs. The different structure of the excitation spectrum results in distinct critical behavior of correlation functions around the SU(4) point and the region with K≪J. Especially, the exponents in the latter case are universal. |
| 關聯: | Phys. Rev. B, 61(10): 6765-6774 |
| 顯示於類別: | [物理學系] 期刊論文
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