Temperature Dependence of Energy Gaps in Spin-1/2 Dimerized Heisenberg Chain
JIANG Xue-Fan1,3, XING Ding-Yu1, CHEN Hong2
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
2Pohl Institute of Solid State Physics and Department of Physics, Tongji University, Shanghai 200092
3Department of Physics, Changshu College, Changshu 215500
Temperature Dependence of Energy Gaps in Spin-1/2 Dimerized Heisenberg Chain
JIANG Xue-Fan1,3;XING Ding-Yu1;CHEN Hong2
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
2Pohl Institute of Solid State Physics and Department of Physics, Tongji University, Shanghai 200092
3Department of Physics, Changshu College, Changshu 215500
Abstract： We present a method which combines a thermal coherent state approach with a self-consistent quantum theory to investigate the spin-1/2 dimerized antiferromagnetic Heisenberg chain. It is found that both excitation gaps between the ground state and two lowest excited modes, the triplet one-magnon excitation and the singlet two-magnon bound state decrease monotonically with increasing temperature. Our results are consistent with those obtained from the other approximations.
JIANG Xue-Fan;XING Ding-Yu;CHEN Hong. Temperature Dependence of Energy Gaps in Spin-1/2 Dimerized Heisenberg Chain[J]. 中国物理快报, 2002, 19(4): 560-562.
JIANG Xue-Fan, XING Ding-Yu, CHEN Hong. Temperature Dependence of Energy Gaps in Spin-1/2 Dimerized Heisenberg Chain. Chin. Phys. Lett., 2002, 19(4): 560-562.
2002, Vol. 19 
