Institute of Physics of the Polish Academy of Sciences, Warsaw, Poland.
Phys Rev Lett. 2012 Mar 16;108(11):115301. doi: 10.1103/PhysRevLett.108.115301. Epub 2012 Mar 13.
We study the extended Bose-Hubbard model describing an ultracold gas of dipolar molecules in an optical lattice, taking into account all on-site and nearest-neighbor interactions, including occupation-dependent tunneling and pair tunneling terms. Using exact diagonalization and the multiscale entanglement renormalization ansatz, we show that these terms can destroy insulating phases and lead to novel quantum phases. These considerable changes of the phase diagram have to be taken into account in upcoming experiments with dipolar molecules.
我们研究了扩展的玻色-哈伯德模型，该模型描述了在光学晶格中处于超冷状态的偶极分子气体，考虑了所有的局域和最近邻相互作用，包括与占据数相关的隧穿和对隧穿项。通过精确对角化和多尺度纠缠重整化近似方法，我们表明这些项可以破坏绝缘相并导致新的量子相。在即将进行的偶极分子实验中，必须考虑这些对相图的重大改变。
