Very large Dzyaloshinskii-Moriya interaction in two-dimensional Janus manganese dichalcogenides and its application to realize skyrmion states

Liang, Jinghua; Wang, Weiwei; Du, Haifeng; Hallal, Ali; Garcia, K.; Chshiev, M.; Fert, A.; Yang, Haolin

doi:10.1103/physrevb.101.184401

Cited by 194 publications

(221 citation statements)

References 63 publications

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“…[1][2][3] Considering the discoveries made by the effects of electric field and broken crystal symmetry in the past, there is significant scientific interest in these materials. For example, it has recently been theoretically predicted that colossal polarization in 2D layers leads to high Curie temperature (T c ) ferromagnetic order, [4,5] skyrmion formation, [6] giant Rashba splitting, [1] and unique excitonic behavior. [7,8] Especially when these 2D Janus layers are assembled in vertical and lateral heterostructures configurations, it allows one to access exotic material properties such as magnetic ordering, rich exciton complexes, electric-field-driven catalysis, and…”

Section: Doi: 101002/adma202006320mentioning

confidence: 99%

Room‐Temperature Synthesis of 2D Janus Crystals and their Heterostructures

et al. 2020

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Janus crystals represent an exciting class of 2D materials with different atomic species on their upper and lower facets. Theories have predicted that this symmetry breaking induces an electric field and leads to a wealth of novel properties, such as large Rashba spin–orbit coupling and formation of strongly correlated electronic states. Monolayer MoSSe Janus crystals have been synthesized by two methods, via controlled sulfurization of monolayer MoSe2 and via plasma stripping followed thermal annealing of MoS2. However, the high processing temperatures prevent growth of other Janus materials and their heterostructures. Here, a room‐temperature technique for the synthesis of a variety of Janus monolayers with high structural and optical quality is reported. This process involves low‐energy reactive radical precursors, which enables selective removal and replacement of the uppermost chalcogen layer, thus transforming classical transition metal dichalcogenides into a Janus structure. The resulting materials show clear mixed character for their excitonic transitions, and more importantly, the presented room‐temperature method enables the demonstration of first vertical and lateral heterojunctions of 2D Janus TMDs. The results present significant and pioneering advances in the synthesis of new classes of 2D materials, and pave the way for the creation of heterostructures from 2D Janus layers.

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Section: Doi: 101002/adma202006320mentioning

confidence: 99%

Room‐Temperature Synthesis of 2D Janus Crystals and their Heterostructures

et al. 2020

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“…Thus, the use of large-area chemical vapor deposition (CVD) monolayers is essential to access a small segment of Janus monolayers. Third, limiting the process to handle CVD-grown classical monolayers prevents reaching the electronic/optical (excitonic) quality needed for probing theoretically predicted exotic quantum properties in Janus monolayers [13][14][15] due to the high starting defect density in CVD monolayers. [16,17] Lastly, without the in situ growth monitoring tools, the growth dynamics of 2D Janus monolayers remains unknown.…”

Section: Introductionmentioning

confidence: 99%

Reaching the Excitonic Limit in 2D Janus Monolayers by In Situ Deterministic Growth

et al. 2021

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Named after the two‐faced Roman god of transitions, transition metal dichalcogenide (TMD) Janus monolayers have two different chalcogen surfaces, inherently breaking the out‐of‐plane mirror symmetry. The broken mirror symmetry and the resulting potential gradient lead to the emergence of quantum properties such as the Rashba effect and the formation of dipolar excitons. Experimental access to these quantum properties, however, hinges on the ability to produce high‐quality 2D Janus monolayers. Here, these results introduce a holistic 2D Janus synthesis technique that allows real‐time monitoring of the growth process. This prototype chamber integrates in situ spectroscopy, offering fundamental insights into the structural evolution and growth kinetics, that allow the evaluation and optimization of the quality of Janus monolayers. The versatility of this method is demonstrated by synthesizing and monitoring the conversion of SWSe, SNbSe, and SMoSe Janus monolayers. Deterministic conversion and real‐time data collection further aid in conversion of exfoliated TMDs to Janus monolayers and unparalleled exciton linewidth values are reached, compared to the current best standard. The results offer an insight into the process kinetics and aid in the development of new Janus monolayers with high optical quality, which is much needed to access their exotic properties.

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“…Our strictly two-dimensional considerations apply both to thin films (cf. Appendix B 7) and quasi-two-dimensional layered structures, e.g., van der Waals magnets [140][141][142] and Janus layers [143,144]. Although we concentrated on Néel skyrmions stabilized by interfacial DM interaction, our results can be carried over one to one to Bloch skyrmions due to bulk DM interaction because neither the harmonic magnon bands nor their damping is influenced by the skyrmion helicity.…”

Section: Discussionmentioning

confidence: 96%

Quantum damping of skyrmion crystal eigenmodes due to spontaneous quasiparticle decay

Mook

Klinovaja

Loss

2020

Phys. Rev. Research

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Skyrmion crystals support chiral magnonic edge states akin to electronic quantum Hall edge states. However, magnonic topology relies on the harmonic approximation, neglecting ubiquitous magnon-magnon interactions that yield a finite zero-temperature quantum damping. We demonstrate that spontaneous quasiparticle decay in two-dimensional ferromagnetic skyrmion crystals is a delicate issue, with the quantum damping ranging over several orders of magnitude. Flat magnon bands cause exceptionally strong spontaneous decay at twice their energy. The resulting externally controllable energy-selective magnon breakdown is measurable not only by scattering but also by magnetic resonance experiments, probing the magnetically active anticlockwise, breathing, and clockwise modes. They exhibit distinct decay behavior, with the clockwise (anticlockwise) mode being the least (most) stable mode out of the three. The quantum damping of the topologically nontrivial anticlockwise mode is negligible, establishing the harmonic theory as a trustworthy approximation at low energies, implying excellent prospects of topological magnonics in skyrmion crystals.

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Very large Dzyaloshinskii-Moriya interaction in two-dimensional Janus manganese dichalcogenides and its application to realize skyrmion states

Cited by 194 publications

References 63 publications

Room‐Temperature Synthesis of 2D Janus Crystals and their Heterostructures

Room‐Temperature Synthesis of 2D Janus Crystals and their Heterostructures

Reaching the Excitonic Limit in 2D Janus Monolayers by In Situ Deterministic Growth

Quantum damping of skyrmion crystal eigenmodes due to spontaneous quasiparticle decay

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