Interaction and filling-induced quantum phases of dual Mott insulators of bosons and fermions
Interaction and filling-induced quantum phases of dual Mott insulators of bosons and fermions
复制标题
DOI：
10.1038/nphys2028
复制
发表时间：
2010-11
期刊：
影响因子：
19.6
通讯作者：
S. Sugawa;K. Inaba;S. Taie;R. Yamazaki;M. Yamashita;Y. Takahashi
中科院分区：
文献类型：
--
作者：
S. Sugawa;K. Inaba;S. Taie;R. Yamazaki;M. Yamashita;Y. Takahashi
多体效应是凝聚态物理中各种现象的核心。一个明显的例子是Mott-绝缘体相，由于强烈的排斥作用，导电性被抑制。冷原子物理学的进展导致了光学晶格中原子的Mott绝缘相的实现，模拟了相应的凝聚态系统。在这里，我们探索了一个奇异的强关联系统，它由玻色子和费米子组成的双Mott绝缘体相互作用。我们发现，玻色子和费米子之间的物种间相互作用极大地改变了每个Mott绝缘体，导致了包括熔化、复合粒子的生成、反关联相和完全相分离的影响。实验结果与数值模拟结果的比较表明，吸引力和排斥性相互作用的双Mott绝缘子分别存在本征绝热和绝热冷却。
Many-body effects are at the very heart of diverse phenomena found in condensed-matter physics. One striking example is the Mott-insulator phase, where conductivity is suppressed as a result of a strong repulsive interaction. Advances in cold-atom physics have led to the realization of the Mott-insulating phases of atoms in an optical lattice, mimicking the corresponding condensed-matter systems. Here, we explore an exotic strongly-correlated system of interacting dual Mott insulators of bosons and fermions. We find that an interspecies interaction between bosons and fermions drastically modifies each of the Mott insulators, causing effects that include melting, generation of composite particles, an anti-correlated phase and complete phase separation. Comparison between the experimental results and numerical simulations indicate intrinsic adiabatic heating and cooling for the attractively and repulsively interacting dual Mott insulators, respectively.