固体电子学研究与进展
固體電子學研究與進展
고체전자학연구여진전
RESEARCH & PROGRESS OF SOLID STATE ELECTRONICS
2009年
4期
520-524,533
,共6页
郭良%田红灯%王利光%王畅%李勇
郭良%田紅燈%王利光%王暢%李勇
곽량%전홍등%왕리광%왕창%리용
封闭型碳纳米管%透射概率%广义梯度近似%非平衡态格林函数
封閉型碳納米管%透射概率%廣義梯度近似%非平衡態格林函數
봉폐형탄납미관%투사개솔%엄의제도근사%비평형태격림함수
capped carbon nanotube%transmission probability%generalized gradient approximation%non-equilibrium Green's functionPACC%7210
采用广义梯度近似(Generalized gradient approximation, GGA)密度泛函理论与非平衡态格林函数(Non-equilibrium Green's function, NEGF)相结合的方法对两端封闭型单壁(6,0)碳纳米管进行电子传输的理论研究.在温度为300 K的条件下,对不同长度(6,0)单壁碳纳米管(SWNT)进行电子透射概率计算.结果显示,两端封闭型(6,0)碳纳米管的电子传输属于量子化传输模式,并随着碳纳米管长度的增加,某些电子透射概率峰值所对应的能量值并未有大的变化,且呈现线性分布;两端封闭型单壁(6,0)碳纳米管中电子的传输接近无散射弹道传输模式,该系统概率尖峰能量的平均间距约为n×2.2 eV,n为整数且1≤n≤6.
採用廣義梯度近似(Generalized gradient approximation, GGA)密度汎函理論與非平衡態格林函數(Non-equilibrium Green's function, NEGF)相結閤的方法對兩耑封閉型單壁(6,0)碳納米管進行電子傳輸的理論研究.在溫度為300 K的條件下,對不同長度(6,0)單壁碳納米管(SWNT)進行電子透射概率計算.結果顯示,兩耑封閉型(6,0)碳納米管的電子傳輸屬于量子化傳輸模式,併隨著碳納米管長度的增加,某些電子透射概率峰值所對應的能量值併未有大的變化,且呈現線性分佈;兩耑封閉型單壁(6,0)碳納米管中電子的傳輸接近無散射彈道傳輸模式,該繫統概率尖峰能量的平均間距約為n×2.2 eV,n為整數且1≤n≤6.
채용엄의제도근사(Generalized gradient approximation, GGA)밀도범함이론여비평형태격림함수(Non-equilibrium Green's function, NEGF)상결합적방법대량단봉폐형단벽(6,0)탄납미관진행전자전수적이론연구.재온도위300 K적조건하,대불동장도(6,0)단벽탄납미관(SWNT)진행전자투사개솔계산.결과현시,량단봉폐형(6,0)탄납미관적전자전수속우양자화전수모식,병수착탄납미관장도적증가,모사전자투사개솔봉치소대응적능량치병미유대적변화,차정현선성분포;량단봉폐형단벽(6,0)탄납미관중전자적전수접근무산사탄도전수모식,해계통개솔첨봉능량적평균간거약위n×2.2 eV,n위정수차1≤n≤6.
The density functional theory of the generalized gradient approximation(GGA) and the non-equilibrium Green's function(NEGF) were adopted to calculate the electronic transport properties of single wall with two-end-capped (6,0) carbon nanotube. The probability of the electronic transmission of the carbon nanotube with different lengths was calculated on the condition of 300 K temperature. The results show that the transport in two-end-capped (6,0) carbon nanotube is a quantized mode. As the length increases, the energies at the transmission peaks distribute linearly and do not vary obviously. It means that the electronic transmission in carbon nanotube is close to a ballistic mode. The distance between the transmission peaks was also calculated and its average value is about n·2.2 eV, n is an integer and 1≤n≤6.