Based on a first-principles computational method treating the local Coulomb repulsion of U and Hund's coupling of J separately, we investigate the effects of these important interactions on the electronic and magnetic structures of a layered ferromagnetic semiconductor CrGeTe3. We show that explicit inclusion of a density functional for the coupling J is critical to obtain proper bandgaps of a single-layer and bulk systems with a reasonable U, unlike a usual approximation treating those together. After obtaining reliable U and J, we also study the effects of strain on its energy gap. Within 2% of tensile and compressive strains, respectively, there is no strain-induced semiconductor-to-metal transition, contrary to the results without J, thus highlighting important roles of exchange interactions.
Skip Nav Destination
Article navigation
28 September 2020
Research Article|
September 22 2020
First-principles study on effects of local Coulomb repulsion and Hund's coupling in ferromagnetic semiconductor CrGeTe3
Special Collection:
2D Quantum Materials: Magnetism and Superconductivity
Eunjung Ko
;
Eunjung Ko
Korea Institute for Advanced Study
, Seoul 02455, South Korea
Search for other works by this author on:
Young-Woo Son
Young-Woo Son
a)
Korea Institute for Advanced Study
, Seoul 02455, South Korea
a)Author to whom correspondence should be addressed: hand@kias.re.kr
Search for other works by this author on:
a)Author to whom correspondence should be addressed: hand@kias.re.kr
Note: This paper is part of the Special Topic on 2D Quantum Materials: Magnetism and Superconductivity
J. Appl. Phys. 128, 123901 (2020)
Article history
Received:
May 29 2020
Accepted:
September 04 2020
Citation
Eunjung Ko, Young-Woo Son; First-principles study on effects of local Coulomb repulsion and Hund's coupling in ferromagnetic semiconductor CrGeTe3. J. Appl. Phys. 28 September 2020; 128 (12): 123901. https://doi.org/10.1063/5.0015566
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Citing articles via
A step-by-step guide to perform x-ray photoelectron spectroscopy
Grzegorz Greczynski, Lars Hultman
Selecting alternative metals for advanced interconnects
Jean-Philippe Soulié, Kiroubanand Sankaran, et al.
Explainable artificial intelligence for machine learning prediction of bandgap energies
Taichi Masuda, Katsuaki Tanabe
Related Content
Polarized Raman scattering and magnetic ordering in Mn lightly doped van der Waals Cr1−xMnxGeTe3 crystals
Appl. Phys. Lett. (February 2024)
Magnetic exchange interactions and band gap bowing in NixMg1−xO (0.0 ≤ x ≤ 1.0): A GGA+U density functional study
J. Appl. Phys. (December 2019)
Theoretical study of strain induced magnetic transition of single-layer CrTe3
J. Appl. Phys. (January 2020)
Electronic and magnetic properties of quasi-one-dimensional osmium halide OsCl4
Appl. Phys. Lett. (January 2022)
Ferromagnetism found in two-dimensional materials
Physics Today (July 2017)