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peng.029捐助貴賓 (小有名氣)
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[交流]
【求助】測(cè)試sigma取值時(shí),T*S項(xiàng)的值是負(fù)數(shù)合理嗎? 已有5人參與
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| 蟲友們,剛開始用vasp,在計(jì)算前所做sigma取值測(cè)試,參考的候柱峰入門指南,發(fā)現(xiàn)計(jì)算的OUTCAR里的T*S項(xiàng),EENTRO取值是負(fù)數(shù)(在sigma很小的時(shí)候,比如0.01,0.02等),直到sigma取到0.1時(shí),T*S項(xiàng)才是正的。說明中參考取一個(gè)T*S在1meV以內(nèi)的sigma,不知道該不該考慮負(fù)數(shù)的結(jié)果?按理說,T*S怎么會(huì)是負(fù)數(shù)呢?是不是該舍掉T*S值為負(fù)數(shù)的sigma不考慮,謝謝大家?guī)椭?br /> 附帶能闡明sigma的物理意義和取舍標(biāo)準(zhǔn)的經(jīng)驗(yàn)就更好啦……謝謝! |
VASP |

木蟲 (著名寫手)
新人菜鳥
捐助貴賓 (小有名氣)
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你好,請(qǐng)看附件。里面有腳本。我們服務(wù)器最近登不上,這是參考資料,多謝提醒哈…… 我沒用過論壇里的附件,把pdf放在新浪愛問里面了,搜索vasp就可以找到 或者http://ishare.iask.sina.com.cn/f/6957776.html |

榮譽(yù)版主 (知名作家)
老和山猥瑣派九段
榮譽(yù)版主 (知名作家)
老和山猥瑣派九段
木蟲 (著名寫手)
葉落鷹飛
| it is negative because entropy of the electrons equal -(f*ln(f)+(1-f)*ln(1-f)) and temperature is positive. (f is fermi occupation) so the product value of two part should be negative. nevertheless, for sigma, at different condition it has different meaning. moreover, it is no physical meaning at some condiction. (e.g. guass occupation) However, some people thinks it can be given physical meaning by using some method. it is named cool smearing. |

新蟲 (小有名氣)
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