Recent Advances in Quantum Effects of 2D Materials

Yi, Ya Sha; Chen, Zhanxu; Yu, Xue‐Feng; Zhou, Zhang‐Kai; Li, Jianbao

doi:10.1002/qute.201800111

Cited by 45 publications

(31 citation statements)

References 229 publications

(420 reference statements)

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“…[ 1–5 ] 2D transition metal dichalcogenides (TMDs) with combined magnetic, electric, and optical features are particularly outstanding for the design and fabrication of multifunctional nanodevices. [ 5–7 ] Due to the isotropic Heisenberg exchange, [ 8 ] the Mermin–Wagner theorem predicts the absence of long‐range magnetic order at finite temperatures in 2D materials. TMD monolayers are known to possess no inversion symmetry and their spin–orbit coupling results in a significant splitting of the Kramers degeneracy.…”

Section: Figurementioning

confidence: 99%

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Tunable Ferromagnetism and Thermally Induced Spin Flip in Vanadium‐Doped Tungsten Diselenide Monolayers at Room Temperature

et al. 2020

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The outstanding optoelectronic and valleytronic properties of transition metal dichalcogenides (TMDs) have triggered intense research efforts by the scientific community. An alternative to induce long‐range ferromagnetism (FM) in TMDs is by introducing magnetic dopants to form a dilute magnetic semiconductor. Enhancing ferromagnetism in these semiconductors not only represents a key step toward modern TMD‐based spintronics, but also enables exploration of new and exciting dimensionality‐driven magnetic phenomena. To this end, tunable ferromagnetism at room temperature and a thermally induced spin flip (TISF) in monolayers of V‐doped WSe2 are shown. As vanadium concentration increases, the saturation magnetization increases, which is optimal at ≈4 at% vanadium; the highest doping level ever achieved for V‐doped WSe2 monolayers. The TISF occurs at ≈175 K and becomes more pronounced upon increasing the temperature toward room temperature. The TISF can be manipulated by changing the vanadium concentration. The TISF is attributed to the magnetic‐field‐ and temperature‐dependent flipping of the nearest W‐site magnetic moments that are antiferromagnetically coupled to the V magnetic moments in the ground state. This is fully supported by a recent spin‐polarized density functional theory study. The findings pave the way for the development of novel spintronic and valleytronic nanodevices and stimulate further research.

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Section: Figurementioning

confidence: 99%

“…[ 31 ] While enhancing FM in these semiconductors is the key to developing TMD‐based spintronics and quantum computing technology, it has also enabled the observation and exploitation of new and novel dimensionality‐driven physical phenomena. [ 4–7,21 ]…”

Section: Figurementioning

confidence: 99%

Tunable Ferromagnetism and Thermally Induced Spin Flip in Vanadium‐Doped Tungsten Diselenide Monolayers at Room Temperature

et al. 2020

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“…To study the quantum mechanics enhanced transport phenomena, an essential factor is sufficiently high carrier mobility at low temperatures. [ 464 ] The details of BP and TMDCs with quantum Hall effects are shown in Figure 9g (i–iii). [ 465–467 ] WSe 2 with p‐type has QH transport and MoS 2 and WS 2 with n‐type have Q‐valley electrons due to the absence of conduction band in multilayers at ±K points.…”

Section: Nonlinear Optical Applicationsmentioning

confidence: 99%

An Insightful Picture of Nonlinear Photonics in 2D Materials and their Applications: Recent Advances and Future Prospects

Ahmed

Wang

Kalsoom

et al. 2021

Advanced Optical Materials

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The nonlinear optical (NLO) materials are playing a crucial role in almost all aspects of photonics including imaging frequency, manipulation, photon generation, transmission and detection. The nonlinear optics aims to investigate light response in NLO media, in which the NLO response is normally weak and low energy efficient. A comprehensive summary, discussion, and correlation of the light–matter interaction in the 2D nano‐platform, like graphene and TMDCs, would be inspirational and timely needed. In this contribution, a broad overview and discussion about recent experimental evolution regarding the NLO response and its corresponding applications in various 2D materials are presented. A wide material library including graphene, transition metal dichalcogenides, black phosphorus, MXenes, semimetals, polymer materials, and hybrid structures (0D, 1D, 3D) are discussed. In this review, the qualitative description of NLO is firstly illustrated, followed by various fundamental NLO processes being highlighted. Fundamental limits of nonlinear optics and some of NLO applications are prospected. It is hoped that this comprehensive review will shed a light on the development of nonlinear optics with 2D materials to be applied in the field of photonics and optoelectronics.

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“… 2 Interestingly, 2D physical concepts have been experimentally and theoretically proved in such materials since their discovery, as their atomic layers thinning drastically changes the properties of their bulk counterpart. In particular, as the layer thinning impacts the band structure, quantum confinement, 3 , 4 excitons, 5 topological order 6 and specific magnetic properties can emerge. 7 , 8 Recent discovery of ferromagnetism in monolayer CrI

7 boosted the research towards the 2D magnetism for spintronics.…”

Section: Introductionmentioning

confidence: 99%

Determination of the refractive index and wavelength‐dependent optical properties of few‐layer CrCl within the Fresnel formalism

Gunnella

Zannotti

Giovannetti

et al. 2021

Journal of Microscopy

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Based on previous reports on the optical microscopy contrast of mechanically exfoliated few layer CrCl 3 transferred on 285 nm and 270 nm SiO 2 on Si(100), we focus on the experimental determination of an effective mean complex refractive index via a fitting analysis based on the Fresnel equations formalism. Accordingly, the layer and wavelength-dependent absorbance and reflectance are calculated. Layer and wavelength-dependent optical contrast curves are then evaluated demonstrating that the contrast is significantly high only around welldefined wavelength bands. This is validated a posteriori, by experimental UV-Vis absorbance data. The present study aims to show the way towards the most reliable determination of thickness of the 2D material flakes during exfoliation.

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Recent Advances in Quantum Effects of 2D Materials

Cited by 45 publications

References 229 publications

Tunable Ferromagnetism and Thermally Induced Spin Flip in Vanadium‐Doped Tungsten Diselenide Monolayers at Room Temperature

Tunable Ferromagnetism and Thermally Induced Spin Flip in Vanadium‐Doped Tungsten Diselenide Monolayers at Room Temperature

An Insightful Picture of Nonlinear Photonics in 2D Materials and their Applications: Recent Advances and Future Prospects

Determination of the refractive index and wavelength‐dependent optical properties of few‐layer CrCl within the Fresnel formalism

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