p169. قطبش اسپيني كايرال در لايه نازك عايق توپولوژي

Spin chiral polarization in topologiccal insulator thin films

با مطالعه تئوري سهم پايه هاي اسپين پاريته در ساختار نواري نشان داديم كه در عايق توپولوژي با عدد چرن غير صفر سهم غالب حالت اسپين پاريته در طيف نواري در منطقه اول تغيير مي كند در حاليكه براي يك عايق نرمال با عدد چرن صفر اين تغيير وجود ندارد. علاوه بر آن ترابرد از لايه نازك عايق توپولوژي مغناطيده محاسبه و بر پايه اين حالتها تحليل شد.

We theoretically investigate spin polarization along nanojunctions made by magnetic domains in a thin films of three dimensional ferromagnetic topological insulator (TI) as a quantum anomalous Hall Insulator when a perpendicular applied bias is turned on. By study of the contribution of the spin-parity states in the spectrum, it is demonstrated that in topologically non-trivial bands with non-zero Chern number, there exists a change in spin dominant states among Brillouin zone while spin polarization of trivial bands would be monotonically dominant on one spin. Indeed there is an interplay between topological behaviors of the band Spectrum and contribution of the spin or parity states. Moreover, analysis of the spin states sheds light to the quantum transport through magnetically doped TI thin-film’s nanojunctions, as well.