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yankai131鐵蟲 (小有名氣)
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[交流]
【求助】不太明白Hubbard U與U、J的意義,J值如何算,麻煩高人指點(diǎn)下! 已有3人參與
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MS中的問題,不太明白Hubbard U與U、J的意義,J值如何得到?麻煩高人指點(diǎn)下! 有資料說:“Materials Studio 4.3版本中也給出了一些元素默認(rèn)的U數(shù)值(實(shí)際是Ueff=U-J)”還是不大明白 本人基礎(chǔ)較差! ![]() [ Last edited by yankai131 on 2010-5-17 at 14:04 ] |
鐵桿木蟲 (著名寫手)
GG
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The Coulomb repulsion is characterized by a spherically averaged Hubbard parameter U describing the energy increase for placing an extra electron on a particular site, U = E(dn+1) + E(dn−1) − 2E(dn), and a parameter J representing the screened exchange energy. While U depends on the spatial extent of the wavefunctions and on screening, J is an approximation of the Stoner exchange parameter and almost constant, ∼1 eV [11]. The Mott–Hubbard Hamiltonian includes energy contributions already accounted for by the DFT functional. To correct for this ‘double-counting’, equation (1) is evaluated in the limit of integer occupancies and subtracted from the DFT energy to obtain the spin-polarizedDFT+U energy functional [9, 11]. A simple functional is obtained after some straightforward algebra [9] |

木蟲 (正式寫手)
star watcher
鐵桿木蟲 (著名寫手)
GG

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