Energy Gap Responsible for the 1/3 Magnetization Plateau in Spin-1/2 Trimerized Chain
The magnetization process and elementary excitation spectra of the spin-1/2 trimerized quantum Heisenberg chain are investigated by means of Greens function theory combined with Jordan-Wigner transformation. At zero temperature, a 1/3 magnetization plateau of the system is observed. Meanwhile, we obtain the ground state phase diagram, in which the Luttinger liquid phase, the magnetization plateau state, the gapless phase and the ferromagnetic state are revealed. At finite temperatures, the magnetization behaves differently, implying the system lies in different states under different magnetic fields. It is shown that the elementary excitation spectra can unpuzzle the magnetization process. It is also found that the energy gap in the spectra is responsible for the observed 1/3 magnetization plateau.
Trimerized chain Magnetization Greens function
Shao Hua QU
Department of Physics, Xiangfan University Xiangfan, China
国际会议
2011 International Conference on Electronics and Optoelectronics(2011电子学与光电子学国际会议 ICEOE 2011)
大连
英文
384-388
2011-07-29（万方平台首次上网日期，不代表论文的发表时间）