TOPOLOGICAL PHASE TRANSITION METHOD OF THREE-DIMENSIONAL PHASE INSULATOR FOR ULTRAFAST TERAHERTZ FREQUENCY MODULATION

摘要

The present invention provides a topological phase transition method of three-dimensional (3D) phase insulator for ultrafast terahertz frequency modulation, to change a coupling degree between an energy level of metallic characteristics of the surface and phonon resonance of the bulk of a 3D phase insulator material by adjusting a composition of the 3D phase insulator material, (Bi_(i-x)In_x)_2Se_3, so as to modulate a spectrum of a terahertz frequency passing the material into an asymmetrical shape. An energy level of a surface (yellow) has a metallic topological surface state (TSS) and indium (In) is added to a material of a 3D phase insulator having an insulator or a phase insulator, so the bulk of the inside asymmetrically generates Fano resonance (FR) through interaction or interference between a first terahertz response generated in the bulk and a second terahertz response generated in a predetermined metallic part.;COPYRIGHT KIPO 2016