As conducting polymers belong to the system of wide energy band, the SSH model in a state of tight-binding approximation is too crude.
由于导电高分子是宽能带体系；对于该体系来说，紧束缚近似下的SSH模型是过于粗糙的。
2
The waveguide is preferably in the form of an optical fiber having a cladding that contains a photonic band gap structure which in turn envelopes a light conducting, hollow core portion.
所述波导采用的形式最好是具有包含光子带隙结构的包层而 该结构又包住传导光的空芯部分的光纤。
3
The TESLA positron injector linac with a L-band TW normal conducting structure has been studied, which offers both higher shunt impedance and larger aperture.