Optical and magneto-optical properties of ferromagnetic monolayer CrBr3 : A first-principles GW and GW plus Bethe-Salpeter equation study

@article{Wu2022OpticalAM,
  title={Optical and magneto-optical properties of ferromagnetic monolayer 
CrBr3
: A first-principles 
GW
 and 
GW
 plus Bethe-Salpeter equation study},
  author={Meng Wu and Zhenglu Li and Steven G. Louie},
  journal={Physical Review Materials},
  year={2022}
}
The discovery of atomically thin two-dimensional (2D) magnetic semiconductors has triggered enormous research interest recently. In this work, we use first-principles many-body perturbation theory to study a prototypical 2D ferromagnetic semiconductor, monolayer chromium tribromide (CrBr3). With broken time-reversal symmetry, spin-orbit coupling, and excitonic effects included through the full-spinor GW and GW plus Bethe–Salpeter equation (GW-BSE) methods, we compute the frequency-dependent… 

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References

SHOWING 1-10 OF 121 REFERENCES
Physical origin of giant excitonic and magneto-optical responses in two-dimensional ferromagnetic insulators
TLDR
The authors show that the large optical and MO responses in ferromagnetic monolayer CrI3 arise from strongly bound excitons, extending over several atoms, providing physical understanding of the phenomena as well as potential design principles for engineering magneto-optical and optoelectronic devices using two-dimensional magnets.
Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides
TLDR
The results elucidate both the interlayer coupling and intralayer spin Hamiltonian for all three materials, and further demonstrate that ferromagnetism can be stabilized in monolayer CrBr3 and bilayer CrCl3 without strong anisotropy.
Ligand-field helical luminescence in a 2D ferromagnetic insulator
Bulk chromium tri-iodide (CrI3) has long been known as a layered van der Waals ferromagnet1. However, its monolayer form was only recently isolated and confirmed to be a truly two-dimensional (2D)
Layer-dependent ferromagnetism in a van der Waals crystal down to the monolayer limit
Since the discovery of graphene, the family of two-dimensional materials has grown, displaying a broad range of electronic properties. Recent additions include semiconductors with spin–valley
Electrical control of 2D magnetism in bilayer CrI3
TLDR
Electrical control of magnetism in a bilayer of CrI3 enables the realization of an electrically driven magnetic phase transition and the observation of the magneto-optical Kerr effect in 2D magnets.
Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals
TLDR
It is concluded that Cr2Ge2Te6 is a nearly ideal two-dimensional Heisenberg ferromagnet and so will be useful for studying fundamental spin behaviours, opening the door to exploring new applications such as ultra-compact spintronics.
Electric-field control of magnetism in a few-layered van der Waals ferromagnetic semiconductor
TLDR
It is shown that, via electrostatic gating, a strong field effect can be observed in devices based on few-layered ferromagnetic semiconducting Cr2Ge2Te6, which shows bipolar tunable magnetization loops below the Curie temperature.
Controlling magnetism in 2D CrI3 by electrostatic doping
TLDR
In monolayer CrI3, doping significantly modifies the saturation magnetization, coercive force and Curie temperature, showing strengthened/weakened magnetic order with hole/electron doping, and the result reveals a strongly doping-dependent interlayer exchange coupling, which enables robust switching of magnetization in bilayerCrI3 by small gate voltages.
Pressure-controlled interlayer magnetism in atomically thin CrI3
TLDR
Pressure-induced changes in the magnetic order of atomically thin van der Waals crystals are revealed and attributed toChanges in the stacking arrangement, which suggests a route towards nanoscale magnetic textures by moiré engineering.
Magnetic Two-Dimensional Chromium Trihalides: A Theoretical Perspective.
TLDR
A perspective of the state of the art of the theoretical understanding of magnetic 2D trihalides is provided, most of which will also be relevant for other 2D magnets, such as vanadium trihalide.
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