語系:
繁體中文
English
說明(常見問題)
回圖書館首頁
手機版館藏查詢
登入
回首頁
切換:
標籤
|
MARC模式
|
ISBD
New Developments in Orbital-Free Den...
~
Xia, Junchao.
FindBook
Google Book
Amazon
博客來
New Developments in Orbital-Free Density Functional Theory Enabling Simulations of Covalent Materials.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
New Developments in Orbital-Free Density Functional Theory Enabling Simulations of Covalent Materials./
作者:
Xia, Junchao.
面頁冊數:
406 p.
附註:
Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.
Contained By:
Dissertation Abstracts International76-12B(E).
標題:
Mechanical engineering. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3714042
ISBN:
9781321910698
New Developments in Orbital-Free Density Functional Theory Enabling Simulations of Covalent Materials.
Xia, Junchao.
New Developments in Orbital-Free Density Functional Theory Enabling Simulations of Covalent Materials.
- 406 p.
Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.
Thesis (Ph.D.)--Princeton University, 2015.
This item must not be sold to any third party vendors.
Orbital-free (OF) density functional theory (DFT) is a powerful and numerically efficient first principles quantum mechanics method. Its application has contributed to understanding a diverse set of materials properties in recent decades. However, most previous studies were confined to simple metals. In this thesis, we focus on extending OFDFT to describe covalently-bonded materials and aiming for a balance between accuracy and efficiency.
ISBN: 9781321910698Subjects--Topical Terms:
649730
Mechanical engineering.
New Developments in Orbital-Free Density Functional Theory Enabling Simulations of Covalent Materials.
LDR
:03584nmm a2200361 4500
001
2062508
005
20151027073332.5
008
170521s2015 ||||||||||||||||| ||eng d
020
$a
9781321910698
035
$a
(MiAaPQ)AAI3714042
035
$a
AAI3714042
040
$a
MiAaPQ
$c
MiAaPQ
100
1
$a
Xia, Junchao.
$3
1291042
245
1 0
$a
New Developments in Orbital-Free Density Functional Theory Enabling Simulations of Covalent Materials.
300
$a
406 p.
500
$a
Source: Dissertation Abstracts International, Volume: 76-12(E), Section: B.
500
$a
Adviser: Emily A. Carter.
502
$a
Thesis (Ph.D.)--Princeton University, 2015.
506
$a
This item must not be sold to any third party vendors.
520
$a
Orbital-free (OF) density functional theory (DFT) is a powerful and numerically efficient first principles quantum mechanics method. Its application has contributed to understanding a diverse set of materials properties in recent decades. However, most previous studies were confined to simple metals. In this thesis, we focus on extending OFDFT to describe covalently-bonded materials and aiming for a balance between accuracy and efficiency.
520
$a
We first apply OFDFT to study diatomic molecules, with the Huang-Carter (HC) kinetic energy density functional (KEDF). OFDFT predicts reasonable equilibrium bond lengths, bond dissociation energies, and vibrational frequencies compared to Kohn-Sham (KS) DFT benchmarks. This work indicates significant progress of OFDFT in describing molecules. However, we find that the HC KEDF is computationally expensive and thus inapplicable for large-scale simulations.
520
$a
Consequently, we propose an electron density decomposition formalism for covalent materials. Based on local density information, the total density is decomposed into localized and delocalized electron densities, which are then described by different KEDF models separately. The resulting Wang--Govind--Carter-decomposition (WGCD) KEDF gives accurate properties for bulk semiconductors and isolated molecules. Furthermore, it offers far superior numerical efficiency compared to the previous HC KEDF.
520
$a
We then test the HC and WGCD KEDFs on Li-Si alloys and obtain accurate structures and bulk properties. The OFDFT Li adsorption energies on the Si(100) surface are also close to KSDFT values. OFDFT is thus promising to study mechanical properties of Li-Si alloys and the mixing mechanism during lithiation and delithiation processes.
520
$a
We next focus on single-point KEDFs for localized densities and pointwise quantities including the local kinetic energy density (KED) and the electron localization function (ELF). Based on a transferable correlation between the reduced density and the KED/ELF discovered in bulk metals, we propose new single-point KEDFs which offer significant improvement over previous single-point KEDFs. The work emphasizes pointwise quantities and introduces the connection between KEDFs and ELFs, which should be important for future KEDF development.
520
$a
We also propose a simple density decomposition method which offers more robust convergence and reliable cell relaxation. Other attempts to improve KEDFs for covalent materials and angular-momentum-dependent OFDFT for Li are also discussed.
590
$a
School code: 0181.
650
4
$a
Mechanical engineering.
$3
649730
650
4
$a
Quantum physics.
$3
726746
650
4
$a
Condensed matter physics.
$3
3173567
690
$a
0548
690
$a
0599
690
$a
0611
710
2
$a
Princeton University.
$b
Mechanical and Aerospace Engineering.
$3
2102828
773
0
$t
Dissertation Abstracts International
$g
76-12B(E).
790
$a
0181
791
$a
Ph.D.
792
$a
2015
793
$a
English
856
4 0
$u
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3714042
筆 0 讀者評論
館藏地:
全部
電子資源
出版年:
卷號:
館藏
1 筆 • 頁數 1 •
1
條碼號
典藏地名稱
館藏流通類別
資料類型
索書號
使用類型
借閱狀態
預約狀態
備註欄
附件
W9295166
電子資源
11.線上閱覽_V
電子書
EB
一般使用(Normal)
在架
0
1 筆 • 頁數 1 •
1
多媒體
評論
新增評論
分享你的心得
Export
取書館
處理中
...
變更密碼
登入