Skirlo Scott A, Lu Ling, Igarashi Yuichi, Yan Qinghui, Joannopoulos John, Soljačić Marin
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Smart Energy Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan.
Phys Rev Lett. 2015 Dec 18;115(25):253901. doi: 10.1103/PhysRevLett.115.253901. Epub 2015 Dec 14.
Despite great interest in the quantum anomalous Hall phase and its analogs, all experimental studies in electronic and bosonic systems have been limited to a Chern number of one. Here, we perform microwave transmission measurements in the bulk and at the edge of ferrimagnetic photonic crystals. Band gaps with large Chern numbers of 2, 3, and 4 are present in the experimental results, which show excellent agreement with theory. We measure the mode profiles and Fourier transform them to produce dispersion relations of the edge modes, whose number and direction match our Chern number calculations.
尽管人们对量子反常霍尔相及其类似物有着浓厚兴趣，但在电子和玻色子系统中的所有实验研究都局限于陈数为1的情况。在此，我们对亚铁磁光子晶体的体相和边缘进行微波传输测量。实验结果中出现了陈数为2、3和4的大带隙，与理论结果吻合良好。我们测量了模式分布并对其进行傅里叶变换以得到边缘模式的色散关系，其数量和方向与我们的陈数计算结果相符。
