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Title: Distinct spin–lattice and spin–phonon interactions in monolayer magnetic CrI3

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C8CP03599G· OSTI ID:1474613
 [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Towson University, MD (United States). Department of Physics, Astronomy, and Geosciences
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)

In this study, we apply the density-functional theory to study various phases (including non-magnetic (NM), anti-ferromagnetic (AFM), and ferromagnetic (FM)) in monolayer magnetic chromium triiodide (CrI3), a recently fabricated 2D magnetic material. It is found that: (1) the introduction of magnetism in monolayer CrI3 gives rise to metal-to-semiconductor transition; (2) the electronic band topologies as well as the nature of direct and indirect band gaps in either AFM or FM phases exhibit delicate dependence on the magnetic ordering and spin–orbit coupling; and (3) the phonon modes involving Cr atoms are particularly sensitive to the magnetic ordering, highlighting distinct spin–lattice and spin–phonon coupling in this magnet. First-principles simulations of the Raman spectra demonstrate that both frequencies and intensities of the Raman peaks strongly depend on the magnetic ordering. The polarization dependent A1g modes at 77 cm-1 and 130 cm-1 along with the Eg mode at about 50 cm-1 in the FM phase may offer a useful fingerprint to characterize this material. Lastly, our results not only provide a detailed guiding map for experimental characterization of CrI3, but also reveal how the evolution of magnetism can be tracked by its lattice dynamics and Raman response.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1474613
Alternate ID(s):
OSTI ID: 1468663
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 20, Issue 36; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Cited By (10)

Nonvolatile Electrical Control and Heterointerface‐Induced Half‐Metallicity of 2D Ferromagnets journal April 2019
Lattice Dynamics, Phonon Chirality, and Spin–Phonon Coupling in 2D Itinerant Ferromagnet Fe 3 GeTe 2 journal September 2019
Switching 2D magnetic states via pressure tuning of layer stacking journal October 2019
Tuning inelastic light scattering via symmetry control in the two-dimensional magnet CrI3 journal January 2020
Electronic structure and magnetic properties of few-layer Cr 2 Ge 2 Te 6 : the key role of nonlocal electron–electron interaction effects journal September 2019
Recent progress of spintronics based on emerging 2D materials: CrI 3 and Xenes journal December 2019
Strain-tunable orbital, spin-orbit, and optical properties of monolayer transition-metal dichalcogenides journal November 2019
First-principles studies of spin-phonon coupling in monolayer C r 2 G e 2 T e 6 journal December 2019
Strain-tunable orbital, spin-orbit, and optical properties of monolayer transition-metal dichalcogenides text January 2019
Electronic structure and magnetic properties of few-layer Cr$_2$Ge$_2$Te$_6$: the key role of nonlocal electron-electron interaction effects text January 2019

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