Enhanced Superconductivity in Monolayer Td-MoTe2

Rhodes, Daniel; Jindal, Apoorv; Yuan, Noah F. Q.; Jung, Younghun; Antony, Abhinandan; Wang, Hua; Kim, Bumho; Chiu, Yu-Che; Taniguchi, Takashi; Watanabe, Kenji; Barmak, K.; Balicas, Luis; Dean, Cory; Qian, Xiaofeng; Fu, Liang; Pasupathy, Abhay; Hone, James

doi:10.1021/acs.nanolett.0c04935

Cited by 63 publications

(77 citation statements)

References 49 publications

(91 reference statements)

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“…This has been assumed to be evidence for the so-called Ising-paired state, whose spin-singlet Cooper pairing would occur among carriers at the K and K′ valleys having opposite spins. Moreover, in 2D MoTe 2, a type-II Weyl semimetal, T C can be enhanced either through a sulfur doping driven phase transition (from the monoclinic 1T′ to the orthorhombic T d phase) (8), which is claimed to enhance the electron-phonon coupling (9), or through exfoliation down to the monolayer limit (10). Two-dimensional superconductivity is now emerging as a scientific frontier addressing a number of unanswered questions, such as the disparate evolution of the superconducting transition temperature as a function of the number of layers and different stackings within different compounds (6,7).…”

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confidence: 99%

Superconductivity enhancement in phase-engineered molybdenum carbide/disulfide vertical heterostructures

Zhang

Zheng

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Stacking layers of atomically thin transition-metal carbides and two-dimensional (2D) semiconducting transition-metal dichalcogenides, could lead to nontrivial superconductivity and other unprecedented phenomena yet to be studied. In this work, superconducting α-phase thin molybdenum carbide flakes were first synthesized, and a subsequent sulfurization treatment induced the formation of vertical heterolayer systems consisting of different phases of molybdenum carbide—ranging from α to γ′ and γ phases—in conjunction with molybdenum sulfide layers. These transition-metal carbide/disulfide heterostructures exhibited critical superconducting temperatures as high as 6 K, higher than that of the starting single-phased α-Mo2C (4 K). We analyzed possible interface configurations to explain the observed moiré patterns resulting from the vertical heterostacks. Our density-functional theory (DFT) calculations indicate that epitaxial strain and moiré patterns lead to a higher interfacial density of states, which favors superconductivity. Such engineered heterostructures might allow the coupling of superconductivity to the topologically nontrivial surface states featured by transition-metal carbide phases composing these heterostructures potentially leading to unconventional superconductivity. Moreover, we envisage that our approach could also be generalized to other metal carbide and nitride systems that could exhibit high-temperature superconductivity.

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confidence: 99%

Superconductivity enhancement in phase-engineered molybdenum carbide/disulfide vertical heterostructures

Zhang

Zheng

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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“…The proposed approach potentially can be applicable for a wide range of materials, including 2D superconductors [ 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ] and superhydrides [ 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ].…”

Section: Discussionmentioning

confidence: 99%

Quantifying the Charge Carrier Interaction in Metallic Twisted Bilayer Graphene Superlattices

Talantsev

2021

Nanomaterials

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The mechanism of charge carrier interaction in twisted bilayer graphene (TBG) remains an unresolved problem, where some researchers proposed the dominance of the electron–phonon interaction, while the others showed evidence for electron–electron or electron–magnon interactions. Here we propose to resolve this problem by generalizing the Bloch–Grüneisen equation and using it for the analysis of the temperature dependent resistivity in TBG. It is a well-established theoretical result that the Bloch–Grüneisen equation power-law exponent, p, exhibits exact integer values for certain mechanisms. For instance, p = 5 implies the electron–phonon interaction, p = 3 is associated with the electron–magnon interaction and p = 2 applies to the electron–electron interaction. Here we interpret the linear temperature-dependent resistance, widely observed in TBG, as p→1, which implies the quasielastic charge interaction with acoustic phonons. Thus, we fitted TBG resistance curves to the Bloch–Grüneisen equation, where we propose that p is a free-fitting parameter. We found that TBGs have a smoothly varied p-value (ranging from 1.4 to 4.4) depending on the Moiré superlattice constant, λ, or the charge carrier concentration, n. This implies that different mechanisms of the charge carrier interaction in TBG superlattices smoothly transition from one mechanism to another depending on, at least, λ and n. The proposed generalized Bloch–Grüneisen equation is applicable to a wide range of disciplines, including superconductivity and geology.

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“…Intrinsic SC can be induced in monolayer WTe 2 by electrostatic gating at 0.82 K 120,121 . Bulk and monolayer MoTe 2 has intrinsic SC at 0.25 and 8 K, respectively 122,123 . K‐intercalated WTe 2 synthetsized by liquid ammonia method shows improved superconducting transition temperature at 2.6 K 110 .…”

Section: Electronic Properties Of Intercalated Tmdsmentioning

confidence: 99%

Intercalated phases of transition metal dichalcogenides

Wang

et al. 2020

SmartMat

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Two‐dimensional transition metal dichalcogenides (TMDs) play host to a wide range of novel topological states, such as quantum spin Hall insulators, superconductors, and Weyl semimetals. The rich polymorphism in TMDs suggests that phase engineering can be used to switch between different charge order states. Intercalation of atoms or molecules into the van der Waals gap of TMDs has emerged as a powerful approach to modify the properties of the material, leading to phase transition or the formation of substoichiometric phases via compositional tuning, thus broadening the electronic and optical landscape of these materials for a wide range of applications. Here, we review the current efforts in the preparation of intercalated TMD. The challenges and opportunities for intercalated TMDs to create a new device paradigm for material science are discussed.

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Enhanced Superconductivity in Monolayer T_d-MoTe₂

Cited by 63 publications

References 49 publications

Superconductivity enhancement in phase-engineered molybdenum carbide/disulfide vertical heterostructures

Superconductivity enhancement in phase-engineered molybdenum carbide/disulfide vertical heterostructures

Quantifying the Charge Carrier Interaction in Metallic Twisted Bilayer Graphene Superlattices

Intercalated phases of transition metal dichalcogenides

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