tight-binding approximation 中文意思是什麼
tight-binding approximation
解釋
緊束縛近似- tight : adj 1 堅實的；堅固的，堅牢的，緊的，不松動的。2 緊密的；密封的，氣密的；不漏的。3 緊張的，繃緊的 ...
- binding : adj 1 縛[捆、綁]…的；黏合的；系連的，連結的。2 有束縛力的，有拘束力的，附有義務的。3 〈口語〉引起...
- approximation : n. 1. 接近；近似。2. 【數學】近似值。3. 概算，略計。
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Abstract : the effect of correction of self - consistent potential on electronic structure in simple cubic nanocrystal particles is calculated by means of the green ' s function method in the tight - binding approximation, taking only the nearest neighbor matrix elements into account. the numerical results show that the electronic energy spectrum is shifted, the chemical potential is not equal to the atomic energy level, the electronic density at each lattice point is changed, and the variation of electronic density at surface lattice point is the largest
文摘:在緊束縛近似下，只計及最近鄰的矩陣元，採用格林函數計算了自洽勢修正對簡立方納米晶體顆粒的電子結構的影響，發現電子能譜發生了移動，化學勢不等於格點原子能級，各格點的電子密度也發生了變化，其中以表面格點的電子密度變化最大。 -
A perturbation method by tight - binding approximation which provide the relation of phase constant and angular spectrum of fields of in - waveguide is presented. the strip width of phase constant can be given. on the other hand, the group delay - time due to the k dispersion in single - mode transmission can also be estimated
提出一種利用緊束縛近似的微擾法計算陣列波導的相位常數與輸入光角譜的關系，由此算出相位常數的帶寬，並利用衍射方法估算單模傳輸中k色散引起的群延時。
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