Ren Jie, Wu Yin-Zhong, Xu Xue-Fen
Department of Physics and Jiangsu Laboratory of Advanced Functional Material, Changshu Institute of Technology, Changshu 215500, China.
Department of Physics, School of Mathematics and Physics, Suzhou University of Science and Technology, Suzhou, Jiangsu 215009, Peoples Republic of China.
Sci Rep. 2015 Oct 5;5:14743. doi: 10.1038/srep14743.
Using the adaptive time-dependent density matrix renormalization group method, we numerically investigate the expansion dynamics of bosons in a one-dimensional hard-core boson model with three-body interactions. It is found that the bosons expand ballistically with weak interaction, which are obtained by local density and the radius Rn. It is shown that the expansion velocity V, obtained from Rn = Vt, is dependent on the number of bosons. As a prominent result, the expansion velocity decreases with the enhancement of three-body interaction. We further study the dynamics of the system, which quenches from the ground state with two-thirds filling, the results indicate the expansion is also ballistic in the gapless phase regime. It could help us detect the phase transition in the system.
利用自适应含时密度矩阵重整化群方法，我们对具有三体相互作用的一维硬核玻色子模型中玻色子的膨胀动力学进行了数值研究。研究发现，在弱相互作用下玻色子呈弹道式膨胀，这可通过局域密度和半径Rn得到。结果表明，由Rn = Vt得出的膨胀速度V取决于玻色子的数量。一个显著的结果是，膨胀速度随着三体相互作用的增强而降低。我们进一步研究了系统从三分之二填充的基态猝灭后的动力学，结果表明在无隙相区域膨胀也是弹道式的。这有助于我们探测系统中的相变。
