Moiré impurities in twisted bilayer black phosphorus: Effects on the carrier mobility

Peng, Kang; Zhang, Wanting; Michaud-Rioux, Vincent; Kong, Xianghua; Hu, Chen; Yu, Guo; Guo, Hong

doi:10.1103/physrevb.96.195406

Cited by 70 publications

(75 citation statements)

References 48 publications

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“…The vast majority of the reported examples of MPs arise from hexagonal lattices superposed onto other hexagonal lattices, e.g., on multilayered graphene/graphite systems [18,19,23,[34][35][36], Pb on Ag(111) [37], graphene on h-BN [28][29][30], on Ir(111) [38], on Cu(111) [39], etc. More rarely, the interfering crystalline structures (under-and overlayer) possess a rectangular symmetry, e.g., Bi on GaAs(110) [40], NaCl on Ag(100) [41], twisted bilayer phosphorene [42], or monolayer Bi (MBi) on α-Bi [43]. Our reports on group-V compounds on HOPG and MoS 2 [44,45] constitute, to the best of our knowledge, the only experimental reports focusing on the MPs generated by a mixed symmetry stacking (e.g., rectangular and hexagonal symmetries).…”

Section: A Observation Of Moiré Patternsmentioning

confidence: 99%

Moiré patterns in van der Waals heterostructures

et al. 2019

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Using scanning tunneling microscopy, we report the observation of moiré patterns (MPs) on van der Waals heterostructures comprised of various 2D allotropes of bismuth and antimony grown on highly ordered pyrolytic graphite and MoS 2 . The spatial periods of the MPs range from λ ∼ 1 to ∼10 nm. For all the reported cases (α-bismuthene, α-antimonene, β-antimonene, and monolayer bismuthene), we model the observations using a simple superposition model (SSM). Where possible, the results obtained from the SSM are compared to analytical prediction. MPs emerging from mixed symmetry stacking (hexagonal on rectangular) are explained without requiring commensuration of the layers.

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Section: A Observation Of Moiré Patternsmentioning

confidence: 99%

Moiré patterns in van der Waals heterostructures

et al. 2019

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“…Phonon-limited carrier mobility in CrS2 few-layer with a finite thickness Weff is expressed as [62][63][64][65]:…”

Section: Carrier Mobility Estimationmentioning

confidence: 99%

Layer and doping tunable ferromagnetic order in two-dimensional CrS2 layers

et al. 2018

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Interlayer coupling is of vital importance for manipulating physical properties, e.g. electronic bandgap, in two-dimensional materials. However, tuning magnetic properties in these materials is yet to be addressed. Here, we found the in-plane magnetic orders of CrS2 mono-and few-layers are tunable between striped antiferromagnetic (sAFM) and ferromagnetic (FM) orders by manipulating charge transfer between Cr t2g and eg orbitals. Such charge transfer is realizable through interlayer coupling, direct charge doping or substituting S with Cl atoms. In particular, the transferred charge effectively reduces a portion of Cr 4+ to Cr 3+ , which, together with delocalized S p orbitals and their resulting direct S-S interlayer hopping, enhances the double-exchange mechanism favoring the FM rather than sAFM order. An exceptional interlayer spin-exchange parameter was revealed over -10 meV, an order of magnitude stronger than available results of interlayer magnetic coupling. It addition, the charge doping could tune CrS2 between p-and n-doped magnetic semiconductors. Given these results, several prototype devices were proposed for manipulating magnetic orders using external electric fields or mechanical motion. These results manifest the role of interlayer coupling in modifying magnetic properties of layered materials and shed considerable light on manipulating magnetism in these materials.

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“…On introducing a small-angle twist between the two layers of a bilayer system leads to the formation of a large scale moiré superlattice (MSL). [8][9][10] MSLs have interesting properties at the electronic as well as the structural level. The moiré pattern is composed of various local high-symmetry stackings.…”

Section: Introductionmentioning

confidence: 99%

“…The moiré pattern is composed of various local high-symmetry stackings. [8][9][10] Structural reconstructions lead to the formation of shear strain solitons at stacking boundaries and topological point defects in twisted bilayer graphene (tBLG). 8,[11][12][13][14] Unconventional superconductivity was recently observed in tBLG at a 'magic' 15 twist angle due to the formation of ultraflatbands close to the Fermi level.…”

Section: Introductionmentioning

confidence: 99%

Kolmogorov–Crespi Potential For Multilayer Transition-Metal Dichalcogenides: Capturing Structural Transformations in Moiré Superlattices

et al. 2019

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We develop parameters for the interlayer Kolmogorov-Crespi (KC) potential to study structural features of four transition metal dichalcogenides (TMDs): MoS 2 , WS 2 , MoSe 2 and WSe 2 . We also propose a mixing rule to extend the parameters to their heterostructures. Moiré superlattices of twisted bilayer TMDs have been recently shown to host shear solitons, topological point defects and ultraflatbands close to the valence band edge. Performing structural relaxations at the DFT level is a major bottleneck in the study of these systems. We show that the parametrized KC potential can be used to obtain atomic relaxations in good agreement with DFT relaxations. Furthermore, the moiré superlattices relaxed using DFT and the proposed forcefield yield very similar electronic band structures.

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Moiré impurities in twisted bilayer black phosphorus: Effects on the carrier mobility

Cited by 70 publications

References 48 publications

Moiré patterns in van der Waals heterostructures

Moiré patterns in van der Waals heterostructures

Layer and doping tunable ferromagnetic order in two-dimensional CrS2 layers

Kolmogorov–Crespi Potential For Multilayer Transition-Metal Dichalcogenides: Capturing Structural Transformations in Moiré Superlattices

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