Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session F59: Electronic Structure: Theory and Spectra
11:30 AM–1:54 PM,
Tuesday, March 16, 2021
Sponsoring
Unit:
FIAP
Chair: Peihong Zhang, State Univ of NY - Buffalo
Abstract: F59.00011 : Physics of the indirect- to direct-gap transition in group-IV semiconductor alloys*
1:30 PM–1:42 PM
Live
Presenter:
Christopher Broderick
(Tyndall National Institute)
Authors:
Christopher Broderick
(Tyndall National Institute)
Eoin O'Reilly
(Tyndall National Institute)
Despite strong experimental activity detailed analysis of Ge1-x(C,Sn,Pb)x has been limited, with distinct mechanisms proposed to describe the emergence of a direct band gap based on chemical trends observed in III-V semiconductors. Recent analysis has revealed the nature of the band structure of Ge1-x(C,Sn,Pb)x alloys, highlighting that alloy band mixing effects play a critical and overlooked role [1-3].
We combine first principles and empirical atomistic calculations to analyse the nature and evolution of the electronic structure of Ge1-x(C,Sn,Pb)x alloys, providing a unified understanding of the electronic properties of this emerging class of semiconductors.
[1] C. A. Broderick et al, J. Appl. Phys. 126, 195702 (2019)
[2] E. J. O'Halloran et al, Opt. Quant. Electron. 51, 314 (2019)
[3] C. A. Broderick et al, arXiv:1911.05679 (2019)
*This work was supported by the National University of Ireland (Post-Doctoral Fellowship in the Sciences, to C.A.B.) and by Science Foundation Ireland (project no. 15/IA/3082).
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