Spectral and optical properties of Ag3Au(Se2,Te2) and dark matterdetection
Ikusi/ Ireki
Data
2020-01-01Egilea
Sánchez Martínez, M. Á.
Robredo Magro, Iñigo
Bidaurrazaga Barrueta, Arkaitz
Bergara Jauregui, Aitor
De Juan Sanz, Fernando.
Grushin, A G
García Vergniory, Maia
Journal of Physics Materials 3(1) : (2020) // Article ID 014001
Laburpena
Paper • The following article is Open access
Spectral and optical properties of Ag3Au(Se2,Te2) and dark matter detection
M-Á Sánchez-Martínez6,1
, I Robredo6,2,3, A Bidaurrazaga3, A Bergara2,3,4, F de Juan2,5, A G Grushin1
and M G Vergniory7,2,5
Published 29 October 2019 • © 2019 The Author(s). Published by IOP Publishing Ltd
Journal of Physics: Materials, Volume 3, Number 1
Focus on Topological Matter
Citation M-Á Sánchez-Martínez et al 2020 J. Phys. Mater. 3 014001
Download Article PDF
Figures
References
692 Total downloads
4
4 total citations on Dimensions.
Turn on MathJax
Share this article
Share this content via email
Share on Facebook
Share on Twitter
Share on Google+
Share on Mendeley
Article information
Abstract
In this work we study the electronic structure of ${\mathrm{Ag}}_{3}{\mathrm{AuSe}}_{2}$ and ${\mathrm{Ag}}_{3}{\mathrm{AuTe}}_{2}$, two chiral insulators whose gap can be tuned through small changes in the lattice parameter by applying hydrostatic pressure or choosing different growth protocols. Based on first principles calculations we compute their band structure for different values of the lattice parameters and show that while ${\mathrm{Ag}}_{3}{\mathrm{AuSe}}_{2}$ retains its direct narrow gap at the Γ point, ${\mathrm{Ag}}_{3}{\mathrm{AuTe}}_{2}$ can turn into a metal. Focusing on ${\mathrm{Ag}}_{3}{\mathrm{AuSe}}_{2}$ we derive a low energy model around Γ using group theory, which we use to calculate the optical conductivity for different values of the lattice constant. We discuss our results in the context of detection of light dark matter particles, which have masses of the order of a keV, and conclude that ${\mathrm{Ag}}_{3}{\mathrm{AuSe}}_{2}$ satisfies three important requirements for a suitable detector: small Fermi velocities, meV band gap, and low photon screening. Our work motivates the growth of high-quality and large samples of ${\mathrm{Ag}}_{3}{\mathrm{AuSe}}_{2}$ to be used as target materials in dark matter detectors.
Collections
Bestelakorik adierazi ezean, itemaren baimena horrela deskribatzen da:Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.