Permutation-invariant collective variable to track and drive vacancy dynamics in simulations of solids
Permutation-invariant collective variable to track and drive vacancy dynamics in simulations of solids
复制标题
用于跟踪和驱动固体模拟中的空位动态的排列不变集体变量
DOI:
10.1103/physrevb.88.220101
复制
发表时间:
2013
影响因子:
3.7
通讯作者:
T. Frauenheim
中科院分区:
文献类型:
--
作者:
J. Knaup;M. Wehlau;T. Frauenheim
Vacancy dynamics in oxides are vital for understanding redox reactions and resulting memristive effects or catalytic activity. We present a method to track and drive vacancies which we apply to metadynamics simulation of oxygen vacancies (V) in rutile, demonstrating its effectiveness. Using the density-functional based tight-binding method, it is possible to explore the free energy hyperplane of oxygen vacancies in TiO. We show that the migration of Vin TiOis governed by the jump with the highest degree of topological interconnection. Free energy profiles are consistent with minimum energy paths.