Skirlo Scott A, Lu Ling, Soljačić Marin
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Phys Rev Lett. 2014 Sep 12;113(11):113904. doi: 10.1103/PhysRevLett.113.113904.
Current experimental realizations of the quantum anomalous Hall phase in both electronic and photonic systems have been limited to a Chern number of one. In photonics, this corresponds to a single-mode one-way edge waveguide. Here, we predict quantum anomalous Hall phases in photonic crystals with large Chern numbers of 2, 3, and 4. These new topological phases were found by simultaneously gapping multiple Dirac and quadratic points. We demonstrate a continuously tunable power splitter as a possible application of multimode one-way waveguides. All our findings are readily realizable at microwave frequencies.
目前在电子和光子系统中对量子反常霍尔相的实验实现都局限于陈数为1的情况。在光子学中，这对应于单模单向边缘波导。在此，我们预测了陈数为2、3和4的大陈数光子晶体中的量子反常霍尔相。这些新的拓扑相是通过同时消除多个狄拉克点和二次点而发现的。我们展示了一种连续可调的功率分配器，作为多模单向波导的一种可能应用。我们所有的发现都很容易在微波频率下实现。
