Superconductivity in metallic twisted bilayer graphene stabilized by WSe2

Arora, Harpreet Singh; Polski, Robert; Zhang, Yiran; Thomson, Alex; Choi, Youngjoon; Kim, Hyunjin; Lin, Zhong; Wilson, Ilham Zaky; Xu, Xiaodong; Chu, Jiun‐Haw; Watanabe, Kenji; Taniguchi, Takashi; Alicea, Jason; Nadj-Perge, Stevan

doi:10.1038/s41586-020-2473-8

Cited by 292 publications

(214 citation statements)

References 52 publications

(61 reference statements)

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“…However, in doing so, addressing the role of electronic interaction has been a major challenge for theorists and experimentalists alike. Attempts to control the insulating or superconducting states by controlling interaction [8][9][10], or otherwise [9,[11][12][13][14][15][16][17][18][19], have led to a surprisingly large number of dissimilar phase diagrams of TBG. In fact, even the number of insulating regions and that of the superconducting domes in these samples (under almost equivalent external circumstances) has been widely different.…”

Section: Introductionmentioning

confidence: 99%

Transport across twist angle domains in moiré graphene

Padhi

Tiwari

Neupert

et al. 2020

Phys. Rev. Research

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Many experiments in twisted bilayer graphene (TBG) differ from each other in terms of the details of their phase diagrams. Few controllable aspects aside, this discrepancy is largely believed to arise from the presence of a varying degree of twist angle inhomogeneity across different samples. Real-space maps indeed reveal TBG devices splitting into several large domains of different twist angles. Motivated by these observations, we study the quantum mechanical tunneling across a domain wall (DW) that separates two such regions. We show that the tunneling of the moiré particles can be understood by the formation of an effective step potential at the DW. The height of this step potential is simply a measure of the difference in twist angles. These computations lead us to identify the global transport signatures for detecting and quantifying the local twist angle variations. In particular, using Landauer-Büttiker formalism, we compute single-channel conductance (dI/dV) and Fano factor for shot noise (ratio of noise power and mean current). A reduction in the low-energy conductance and a zero-bias sub-meV gap in the conductance are observed which scale with the twist angle difference. One of the key findings of our work is that transport in presence of twist angle inhomogeneity is "noisy," though sub-Poissonian. In particular, the differential Fano factor peaks near the van Hove energies corresponding to the domains in the sample. The location and the strength of the peak are simply a measure of the degree of twist angle inhomogeneity.

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Section: Introductionmentioning

confidence: 99%

Transport across twist angle domains in moiré graphene

Padhi

Tiwari

Neupert

et al. 2020

Phys. Rev. Research

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“…When the thickness of the spacer is less than the spatial extent of the unit cell, the interaction strength of electrons in the MATBG is substantially altered. Arora et al 5 report an experiment in which a tungsten diselenide layer is included in a related set-up (not shown). "These findings call into question earlier interpretations of certain observations in magic-angle twisted bilayer graphene.…”

Section: Ronny Thomalementioning

confidence: 99%

“…Discoveries indicating communal nesting 3 and brooding 4 have also revealed the antiquity of bird-like parenting behaviours in dinosaurs. Yet, despite research shedding light on the biochemistry 5 and coloration 6 of fossil eggs, the known diversity of egg-laying dinosaurs is still limited to only a few groups, including the gigantic sauropods, carnivorous theropods and duck-billed hadrosaurs. Moreover, most dinosaur eggs are geologically rather young, being derived from rocks of Cretaceous age 3 -the last and longest period of the Mesozoic era, lasting from about 145 million to 66 million years ago.…”

Section: Ronny Thomalementioning

confidence: 99%

“…MATBG belongs to an exceptional group of material platforms in which the electron density can be tuned in situ to switch between insulating and superconducting states 3 . On pages 375 and 379, respectively, Stepanov et al 4 and Arora et al 5 report that the electron inter action strength in MATBG can be tuned at a fixed electron density through tailored design of the dielectric (insulating) environment.…”

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confidence: 99%

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Electronics tuned in twisted bilayer graphene

Thomale¹

2020

Nature

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“…Stacking two sheets of van der Waals materials atop each other at a relative twist has recently emerged as a vibrant research direction to enhance the role of electronic interactions, with first reports on twisted bilayer graphene (2)(3)(4)(5)(6) and other van der Waals materials stacked atop each other at a twist (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) displaying features of correlated physics that afford an unprecedented level of control. In particular, bi-, tri-and quadruple-layer graphene (18) as well as twisted few-layer transition metal dichalcogenides (TMDs) are currently under intense experimental scrutiny (13,(19)(20)(21)(22)(23)(24)(25)(26)(27). By forming a Moiré supercell at small twist angles, a large unit cell in real space emerges for twisted systems, which due to quantum interference effects leads to a quasi-two-dimensional system with strongly quenched kinetic energy scales.…”

Section: Introductionmentioning

confidence: 99%

Realization of nearly dispersionless bands with strong orbital anisotropy from destructive interference in twisted bilayer MoS2

Xian

Claassen

Kiese

et al. 2020

Preprint

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Recently, the twist angle between adjacent sheets of stacked van der Waals materials emerged as a new knob to engineer correlated states of matter in twodimensional heterostructures in a controlled manner, giving rise to emergent phenomena such as superconductivity or correlated insulating states. Here, we use an ab initio based approach to characterize the electronic properties of twisted bilayer MoS2. We report that, in marked contrast to twisted bilayer graphene, slightly hole-doped MoS2 realizes a strongly asymmetric px-py Hubbard model on the honeycomb lattice, with two almost entirely dispersionless bands emerging due to destructive interference. The origin of these dispersionless bands, is similar to that of the flat bands in the prototypical Lieb or Kagome lattices and co-exists with the general band flattening at small twist angle due to the Moir´e interference. We study the collective behavior of twisted bilayer MoS2 in the presence of interactions, and characterize an array of different magnetic and orbitally-ordered correlated phases, which may be susceptible to quantum fluctuations giving rise to exotic, purely quantum, states of matter.

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Superconductivity in metallic twisted bilayer graphene stabilized by WSe2

Cited by 292 publications

References 52 publications

Transport across twist angle domains in moiré graphene

Transport across twist angle domains in moiré graphene

Electronics tuned in twisted bilayer graphene

Realization of nearly dispersionless bands with strong orbital anisotropy from destructive interference in twisted bilayer MoS2

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