dc.contributor.author |
Ouma, C.N.M.
|
|
dc.contributor.author |
Mapelu, M.Z.
|
|
dc.contributor.author |
Makau, N.W.
|
|
dc.contributor.author |
Amolo, G.O.
|
|
dc.contributor.author |
Maezono, Ryo
|
|
dc.date.accessioned |
2012-11-20T11:55:44Z |
|
dc.date.available |
2012-11-20T11:55:44Z |
|
dc.date.issued |
2012-09-28 |
|
dc.description.abstract |
We have investigated the transition pressure pt of bulk GaAs from the zinc-blende (B3) to the rocksalt
(B1) structure using the local-density approximation (LDA), Perdew-Burke-Ernzerhof generalized gradient
approximation (PBE-GGA), and diffusion Monte Carlo (DMC). We took into account finite temperature effects
(zero-point vibrational effects) as well as finite-size corrections. Our DMC calculation using GGA trial nodal
surface supports the higher value of the transition pressure, ∼17 GPa, than the lower value of ∼12 GPa, both
of which are experimentally reported values. This projection increases the transition pressure pt from DFT
predictions, being of the same tendency as that for Si bulk crystal. The choice of the exchange-correlation
functional in DFT was found to significantly determine the phase-transition pressure, while DMC gave more
accurate results for this transition pressure. |
en_US |
dc.description.sponsorship |
The Kenya National
Council for Science and Technology (NCST) Grant No.
NCST/5/003/0241, and the Computational Materials Sciences
Group, Department of Physics, ChepkoilelUniversity College, Eldoret-Kenya. R.M. appreciates the financial support by a Grant
in Aid for Scientific Research on Innovative Areas “Materials
Design through Computics: Complex Correlation and
Non-Equilibrium Dynamics” (Grant No. 22104011), “Optical
Science of Dynamically Correlated Electrons” (Grant No.
23104714) of the Ministry of Education, Culture, Sports,
Science, and Technology (KAKENHI-MEXT/Japan), and
Tokuyama Science Foundation. |
en_US |
dc.description.uri |
http://prb.aps.org/ |
en_US |
dc.identifier.citation |
Ouma, CNM, Mapelu, MZ, Makau, NW, Amolo, GO & Maezono, R 2012, 'Quantum Monte Carlo study of pressure-induced B3-B1 phase transition in GaAs', Physical Review B -Condensed Matter & Materials Physics, vol. 86, no. 10, art. no. 104115. |
en_US |
dc.identifier.issn |
1098-0121 (print) |
|
dc.identifier.issn |
1550-235X (online) |
|
dc.identifier.other |
10.1103/PhysRevB.86.104115 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/20456 |
|
dc.language.iso |
en |
en_US |
dc.publisher |
American Physical Society |
en_US |
dc.rights |
© 2012 American Physical Society |
en_US |
dc.subject |
Monte Carlo tecnique |
en_US |
dc.subject |
Transition pressure |
en_US |
dc.title |
Quantum Monte Carlo study of pressure-induced B3-B1 phase transition in GaAs |
en_US |
dc.type |
Postprint Article |
en_US |