我們用緊束模型（tight–binding model）的方法來求得有限長度碳微管的磁性能帶結構。其能帶結構會受到碳微管的幾何結構(手椅狀碳微管與鋸齒狀碳微管)、半徑、長度、spin-B interaction各方面因素的影響，其特徵結果會直接反應在永續電流（Persistent Currents）的表現上。在能隙發生金屬與半導體轉換的地方，永續電流會有不連續結構的產生。溫度T會使得電流不連續結構改變為峰狀結構並且降低永續電流的大小。

We use the tight-binding model to calculate the magneto band structures of finite carbon nanotubes. They strongly depend on the edge
structures(armchair and zigzag structures), the radius, the length, and the spin-B interaction. Their features are directly reflected in the persistent currents. Such currents exhibit the discontinuous cusp structures in the presence of the metal-semiconductor transition. Temperature changes cusp structures into peak structures and reduces the magnitude of currents

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