Transport of spin-polarized electrons in a magnetic superlattice
文献类型：期刊论文
| 作者 | Liu, JF ; Deng, WJ ; Xia, K ; Zhang, C ; Ma, ZS |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2006 |
| 卷号 | 73期号:15 |
| 关键词 | MAGNETORESISTANCE OSCILLATIONS BARRIER STRUCTURE 2-DIMENSIONAL ELECTRONS GAS FIELD |
| ISSN号 | 1098-0121 |
| 通讯作者 | Liu, JF (reprint author), Peking Univ, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China. |
| 中文摘要 | By using slave particle (slave boson and slave fermion) techniques on the Bose-Hubbard model, we study the finite temperature properties of ultracold Bose gases in optical lattices. The phase diagrams at finite temperature are depicted by including different types of slave particles and the effect of the finite types of slave particles is estimated. The superfluid density is evaluated using the Landau second order phase transition theory. The atom density, excitation spectrum, and dispersion curve are also computed at various temperatures, and how the Mott-insulator evolves as the temperature increases is demonstrated. For most quantities to be calculated, we find that there are no qualitative differences in using the slave boson or the slave fermion approaches. However, when studying the stability of the mean field state, we find that in contrast to the slave fermion approach, the slave boson mean field state is not stable. Although the slave boson mean field theory gives a qualitatively correct phase boundary, it corresponds to a local maximum of Landau free energy and cannot describe the second order phase transition because the coefficient a(4) of the fourth order term is always negative in the free energy expansion. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-23 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/46108]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Liu, JF,Deng, WJ,Xia, K,et al. Transport of spin-polarized electrons in a magnetic superlattice[J]. PHYSICAL REVIEW B,2006,73(15). |
| APA | Liu, JF,Deng, WJ,Xia, K,Zhang, C,&Ma, ZS.(2006).Transport of spin-polarized electrons in a magnetic superlattice.PHYSICAL REVIEW B,73(15). |
| MLA | Liu, JF,et al."Transport of spin-polarized electrons in a magnetic superlattice".PHYSICAL REVIEW B 73.15(2006). |
入库方式： OAI收割
来源：物理研究所
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