Title

Quantum confinement and phase transition in PbS nanowire: A first principles study

Authors

Subhasish Mandal, Michigan Technological University
Ranjit Pati, Michigan Technological UniversityFollow

Document Type

Article

Publication Date

8-12-2009

Abstract

We report first principles density functional calculations of the electronic structures and energy bandgaps (ΔE_g) in PbS nanowires (NW). The ΔE_g is tuned by varying the diameter of the NW –revealing the role of quantum confinement. Compressive radial strain (CS) on the NW is shown to be responsible for a semiconducting to metallic phase transition. When compared with the valence band, the conduction band (CB) of the NW, which has a significant contribution from the excited 3d-orbital of S, is found to be more sensitive to the CS with the CB minimum shifting towards and eventually crossing the Fermi energy as CS increases. The origin of the observed phase transition in a recent experiment is attributed to the CS on the PbS nanowire.

Publisher's Statement

© 2009 Elsevier B.V. All rights reserved. Publisher's version of record: https://doi.org/10.1016/j.cplett.2009.08.023

Publication Title

Chemical Physics Letters

Recommended Citation

Mandal, S., & Pati, R. (2009). Quantum confinement and phase transition in PbS nanowire: A first principles study. Chemical Physics Letters, 479(4-6), 244-247. http://doi.org/10.1016/j.cplett.2009.08.023
Retrieved from: https://digitalcommons.mtu.edu/physics-fp/120