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穎穎的老虎鐵蟲 (小有名氣)
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[求助]
castep問題 已有1人參與
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| 請(qǐng)問氧化鎵GGA+U的U值設(shè)置為多少? |
鐵蟲 (小有名氣)
木蟲 (正式寫手)
newbie
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氧化鎵(Ga2O3)的GGA+U計(jì)算中的U值通常需要通過一系列的測(cè)試和優(yōu)化來確定,因?yàn)檫@個(gè)值取決于計(jì)算方法、計(jì)算軟件和具體研究系統(tǒng)等多個(gè)因素。GGA+U方法主要用于修正密度泛函理論(GGA,Generalized Gradient Approximation)對(duì)于過渡金屬氧化物等系統(tǒng)的電子結(jié)構(gòu)的不足之處。 對(duì)于GGA+U的參數(shù)優(yōu)化,通常的做法是嘗試一系列不同的U值,然后通過與實(shí)驗(yàn)結(jié)果的比較或其他已知的準(zhǔn)確計(jì)算結(jié)果來確定最優(yōu)的U值。這需要一定的計(jì)算資源和經(jīng)驗(yàn)。 如果你在使用特定的計(jì)算軟件,建議查閱該軟件的文檔或相關(guān)文獻(xiàn),以獲取對(duì)于氧化鎵系統(tǒng)的最佳U值的推薦或最佳實(shí)踐。此外,可以查閱已發(fā)表的文獻(xiàn),看看其他研究中使用的U值是多少,以及他們是否有詳細(xì)的優(yōu)化過程。 總的來說,GGA+U方法中的U值并非通用的,最佳值取決于具體的研究系統(tǒng)和計(jì)算條件。 Example 1: For the calculations of formation energies, electronic structures and optical properties, the GGA+U method was adopted. After series tests, the Ud value for Ga-3d and Up value for O-2p were set at 7.0 eV and 8.5 eV, respectively. Under this correction, the reasonable results can be obtained. {https://www.nature.com/articles/srep40160} Example 2: In order to obtain the accurate bandgap of β-Ga2O3, the GGA + U method is adopted and the parameters of Ud,Ga and Up,O are set to be 14.0 eV and 8.35 eV, respectively. The energy cutoff of the plane-wave basis is set to be 450 eV for the calculation of electronic structures and 600 eV for the calculation of optical properties. {https://iopscience.iop.org/article/10.1088/1674-1056/28/1/016301} |
木蟲 (正式寫手)
newbie
木蟲 (正式寫手)
newbie
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