RT Journal Article
SR Electronic
T1 Realization of flat band with possible nontrivial topology in electronic Kagome lattice
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaau4511
DO 10.1126/sciadv.aau4511
VO 4
IS 11
A1 Li, Zhi
A1 Zhuang, Jincheng
A1 Wang, Li
A1 Feng, Haifeng
A1 Gao, Qian
A1 Xu, Xun
A1 Hao, Weichang
A1 Wang, Xiaolin
A1 Zhang, Chao
A1 Wu, Kehui
A1 Dou, Shi Xue
A1 Chen, Lan
A1 Hu, Zhenpeng
A1 Du, Yi
YR 2018
UL http://advances.sciencemag.org/content/4/11/eaau4511.abstract
AB The energy dispersion of fermions or bosons vanishes in momentum space if destructive quantum interference occurs in a frustrated Kagome lattice with only nearest-neighbor hopping. A discrete flat band (FB) without any dispersion is consequently formed, promising the emergence of fractional quantum Hall states at high temperatures. Here, we report the experimental realization of an FB with possible nontrivial topology in an electronic Kagome lattice on twisted multilayer silicene. Because of the unique low-buckled two-dimensional structure of silicene, a robust electronic Kagome lattice has been successfully induced by moirĂ© patterns after twisting the silicene multilayers. The electrons are localized in the Kagome lattice because of quantum destructive interference, and thus, their kinetic energy is quenched, which gives rise to an FB peak in the density of states. A robust and pronounced one-dimensional edge state has been revealed at the Kagome edge, which resides at higher energy than the FB. Our observations of the FB and the exotic edge state in electronic Kagome lattice open up the possibility that fractional Chern insulators could be realized in two-dimensional materials.