کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1863916 | 1037691 | 2014 | 5 صفحه PDF | دانلود رایگان |
• A kagome lattice under a circularly-polarized driving field is studied.
• The band structures and chiral edge states are studied via exact Floquet method.
• Various modifications of the Floquet band structure are found.
• Floquet topological phase transitions appear in both off- and on-resonant cases.
The Floquet topological phases and chiral edge states in a kagome lattice under a circularly-polarized driving field are studied. In the off-resonant case, the system exhibits the similar character as the kagome lattice model with staggered magnetic fluxes, but the total band width is damped in oscillation. In the on-resonant case, the degeneracy splitting at the Γ point does not always result in a gap. The positions of the other two gaps are influenced by the flat band. With the field intensity increased, these two gaps undergo closing-then-reopening processes, accompanied with the changing of the winding numbers.
Journal: Physics Letters A - Volume 378, Issue 43, 5 September 2014, Pages 3200–3204