Wu Congjun
Department of Physics, University of California, San Diego, California 92093, USA.
Phys Rev Lett. 2008 Oct 31;101(18):186807. doi: 10.1103/PhysRevLett.101.186807.
We investigate the topological insulating states of the p-band systems in optical lattices induced by the on site orbital angular momentum polarization, which exhibit gapless edge modes in the absence of Landau levels. This effect arises from the energy-level splitting between the on site p_{x}+ip_{y} and p_{x}-ip_{y} orbitals by rotating each optical lattice site around its own center. At large rotation angular velocities, this model naturally reduces to two copies of Haldane's quantum Hall model. The distribution of the Berry curvature in momentum space and the quantized Chern numbers are calculated. The experimental realization of this state is feasible.
我们研究了由在位轨道角动量极化诱导的光学晶格中p带系统的拓扑绝缘态，该系统在没有朗道能级的情况下表现出无隙边缘模式。这种效应源于通过绕每个光学晶格位点自身中心旋转，在位px + ipy和px - ipy轨道之间的能级分裂。在大旋转角速度下，该模型自然简化为两个哈代量子霍尔模型的副本。计算了动量空间中贝里曲率的分布和量子化的陈数。这种状态的实验实现是可行的。
