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[求助]
求教各位大神,關(guān)于今天看的一篇文獻中,若干個關(guān)于計算參數(shù)設(shè)定的問題……
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今天看了一篇石墨烯吸附K原子的文獻,對計算方法一節(jié)里面的若干問題有所疑問,在這里開貼向各位大俠請教 問題1: 原文:The Brillouin zone was described using a Monkhorst-Pack scheme of special k-points to obtain a general convergence criteria of 5 × 10-3 eV for energies and 0.01 Å for structural variations between two different k-point grids. 這里0.01 Å是指POTIM的數(shù)值嗎? 問題2: 原文:Band diagrams and DOS analysis were obtained by fixing the Wigner-Seitz radius (rWIGS) for the support during integration over the number of electrons and then by setting rWIGS for the adsorbates within the radii of tangential spheres. This method allowed the accurate assignment of relevant atomic orbital attributions to a particular projected DOS peak. 這段提到的是RWIGS的設(shè)置,對于石墨烯吸附K,我的設(shè)置是:RWIGS=1.630 2.275(上述兩個數(shù)值分別是C與K的RWIGS),不知道這樣設(shè)置對不對?文中的話沒讀懂是什么意思…… 問題3:The number of k-points used to describe the irreducible portion of the Brillouin zone was 12 (M&P mesh of 9 × 9 × 1). 這段話就實在是困擾我很久了,為什么9X9X1產(chǎn)生了12個點???怎么算的??? 請各位大俠多多指教 |

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1. 不是potim 就是兩組不同的k點 分別做結(jié)構(gòu)優(yōu)化后 每個原子的位置變化都小于0.01 Angs 2. 他的意思應(yīng)該是把C的rwigs固定不動,變K的rwigs. 作用可能就是說K對pdos的貢獻可以算的更精確. 應(yīng)該是這個意思,我沒做過不好瞎說。。。離子的半徑和原子差很多,所以rwigs是有一定任意性的。樓主可以試試bader analysis。這種方法可以比較“有道理”地決定離子的體積。就不用像文章里那樣一遍遍的試了。代碼在graeme henkleman的網(wǎng)頁上有。用起來很方便。 3. 在outcar里找nkpts看等于幾就知道了 |


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