Canonical-ensemble extended Lagrangian Born–Oppenheimer molecular dynamics for the linear scaling density functional theory. (1st September 2017)

• Record Type: Journal Article
• Authors: Hirakawa, Teruo; Suzuki, Teppei; Bowler, David R; Miyazaki, Tsuyoshi
• Is Part Of: Journal of physics. Volume 29:Number 40(2017)
• Publication Date: 2017-09-01
• Subjects: extended Lagrangian Born–Oppenheimer molecular dynamics -- density matrix minimization method -- linear scaling electronic structure calculations -- canonical ensemble; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa810d
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We discuss the development and implementation of a constant temperature (NVT) molecular dynamics scheme that combines the Nosé–Hoover chain thermostat with the extended Lagrangian Born–Oppenheimer molecular dynamics (BOMD) scheme, using a linear scaling density functional theory (DFT) approach. An integration scheme for this canonical-ensemble extended Lagrangian BOMD is developed and discussed in the context of the Liouville operator formulation. Linear scaling DFT canonical-ensemble extended Lagrangian BOMD simulations are tested on bulk silicon and silicon carbide systems to evaluate our integration scheme. The results show that the conserved quantity remains stable with no systematic drift even in the presence of the thermostat.