Evidence for a quantum spin Hall phase in graphene decorated with Bi
            <sub>2</sub>
            Te
            <sub>3</sub>
            nanoparticles

Hatsuda, K.; Mine, H.; Nakamura, Tsuneyoshi; Li, Jie; Wu, Ruqian; Katsumoto, Shingo; Haruyama, J.

doi:10.1126/sciadv.aau6915

Cited by 44 publications

(62 citation statements)

References 38 publications

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“…Indeed, the adatom decoration process is realized by setting up an evaporation source inside a conventional cryostat, during which the surface conditions of the graphene sample are less controlled. Recently, a study on Bi 2 Te 3 decorated graphene reports resistivity peak values qualitatively agree with helical edge transport result . The authors attribute this behavior to spin–orbit coupling induced by Bi 2 Te 3 .…”

Section: Creating Quantum Spin Hall States In Graphenesupporting

confidence: 55%

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Quantum Spin Hall Materials

Cao

Chen

2019

Adv Quantum Tech

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The quantum spin Hall (QSH) effect describes the state of matter in certain 2D electron systems, in which an insulating bulk state arises together with helical states at the edge of the sample. In stark contrast to its closest kin, the integer quantum Hall state, the QSH state exists only in time‐reversal symmetric system (e.g., in non‐magnetic materials and without the application of external magnetic field). This article reviews the development of the understanding and construction of the QSH states after their first theoretical proposal, with an emphasis on the materials perspective. Certain semiconductor quantum wells and 2D materials with strong spin–orbit coupling have been found to support QSH states.

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Section: Creating Quantum Spin Hall States In Graphenesupporting

confidence: 55%

“…Recently, a study on Bi 2 Te 3 decorated graphene reports resistivity peak values qualitatively agree with helical edge transport result. [139] The authors attribute this behavior to spin-orbit coupling induced by Bi 2 Te 3 . [140] QSH effect is also predicted in graphene interacting with single crystal WS 2 or WSe 2 .…”

Section: Adatoms and Decorationmentioning

confidence: 99%

Quantum Spin Hall Materials

Cao

Chen

2019

Adv Quantum Tech

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“…3(a2). A particular case occur in the hexagonal (4, 6,12), where the SOC do not open the accidental degeneracy Dirac node between 6th and 7th band [ Fig. 3(b1)], which in turn do not have a defined Z 2 invariant.…”

Section: B Qsh Phase Induced By Socmentioning

confidence: 99%

“…In synergy with the experiments, high throughput calculations have bring into evidence new 2D phases 8,9 . In these lower dimensional materials there is an emergence of phenomena prominent for applications. Particularly, the graphene Dirac fermions 10 , quantum spin, anomalous, valley and fractional Hall phases [11][12][13][14][15] , but also electronics based in the valley 16 , layer 17 and cone 18 degrees of freedom. On the other hand, monoatomicaly flat materials like graphene are still rare compared with the vast 2D materials class.…”

Section: Introductionmentioning

confidence: 99%

Topological flat band, Dirac fermions and quantum spin Hall phase in 2D Archimedean lattices

Lima

Ferreira

Miwa

2019

Phys. Chem. Chem. Phys.

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Materials with designed properties arises in a synergy between theoretical and experimental approaches. In this study we explore the set of Archimedean lattices forming a guidance to its electronic properties and topological phases. Within these lattices, rich electronic structure emerge forming type-I and II Dirac fermions, topological flat bands and high-degeneracy points with linear and flat dispersions. Employing a tight-binding model, with spin-orbit coupling, we characterize a quantum spin Hall (QSH) phase in all Archimedean lattices. Our discussion is validated within density functional theory calculations, where we show the characteristic bands of the studied lattices arising in 2D carbon allotropes.

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“…Within these, new quasiparticles [5][6][7][8], and topological/semimetal phases [9][10][11] have attracted great interest in fundamental physics. Focusing in technological applications, quantum Hall effects (spin [12,13], anomalous [14,15] and valley [16]) and thermoelectric properties, to cite a few, are explored for devices engineering based on 2D systems [17][18][19][20][21].The ability to construct lattices on demand promotes the exploration/enhancement of the materials properties. Currently, we are facing a striking synergy between theoretical exploration and experimental lattices designs.…”

mentioning

confidence: 99%

Engineering Metal-sp_xy Dirac Bands on the Oxidized SiC Surface

Lima

Miwa

2020

Nano Lett.

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The ability to construct 2D systems, beyond materials natural formation, enriches the search and control capability of new phenomena. For instance, the synthesis of topological lattices of vacancies on metal surfaces through scanning tunneling microscopy. In the present study we demonstrate that metal atoms encaged in silicate adlayer on silicon carbide is an interesting platform for lattices design, providing a ground to experimentally construct tight-binding models on an insulating substrate. Based on the density functional theory, we have characterized the energetic and the electronic properties of 2D metal lattices embedded in the silica adlayer. We show that the characteristic band structures of those lattices are ruled by surface states induced by the metal-s orbitals coupled by the host-pxy states; giving rise to spxy Dirac bands neatly lying within the energy gap of the semiconductor substrate.In recent years two-dimensional (2D) materials have emerged with prominent phenomena and applications. For instance, graphene, the first observed 2D material, presents relativistic quasiparticles described by the massless Dirac equation [1]; meanwhile many other materials have been theoretically predicted [2, 3] and experimentally synthesized [4]. Within these, new quasiparticles [5][6][7][8], and topological/semimetal phases [9][10][11] have attracted great interest in fundamental physics. Focusing in technological applications, quantum Hall effects (spin [12,13], anomalous [14,15] and valley [16]) and thermoelectric properties, to cite a few, are explored for devices engineering based on 2D systems [17][18][19][20][21].The ability to construct lattices on demand promotes the exploration/enhancement of the materials properties. Currently, we are facing a striking synergy between theoretical exploration and experimental lattices designs. For instance, artificial graphene has been constructed in quantum dots systems [22] and in 2D electron gas [23] allowing the control of the Dirac quasiparticles and topological phases [24]. Beyond these systems, within the organic chemistry, covalent organic frameworks and metal organic frameworks have been successfully synthesized by combining different molecules/metal centers [25][26][27].Further control over lattice formation has been exploited through scanning tunneling microscopy (STM) techniques "printing" atom-by-atom on solid surfaces, where the STM tip brings precise control over the lattice formation [28][29][30][31]. For instance, topological states have been engineered on atomic square lattice in chlorine covered Cu(100) surface by vacancy formation [32]. Changing the substrate surface to Cu(111) lieb lattice [33], graphene-like [34] and quasicristals [35] have been imprinted in a carbon monoxide cover layer, while fractal geometric lattices have been achieved in Co covered Cu(111) [36]. Those studies took advantage of the current state of the art on the control over the atomic and molecular adsorption/desorption processes on metal surfaces. However, it is worth pointing...

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Evidence for a quantum spin Hall phase in graphene decorated with Bi ₂ Te ₃ nanoparticles

Abstract: Topological insulating graphene is created using decoration of an extremely small quantity of heavy nanoparticles.

Cited by 44 publications

References 38 publications

Quantum Spin Hall Materials

Quantum Spin Hall Materials

Topological flat band, Dirac fermions and quantum spin Hall phase in 2D Archimedean lattices

Engineering Metal-sp_xy Dirac Bands on the Oxidized SiC Surface

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Evidence for a quantum spin Hall phase in graphene decorated with Bi 2 Te 3 nanoparticles

Abstract: Topological insulating graphene is created using decoration of an extremely small quantity of heavy nanoparticles.

Cited by 44 publications

References 38 publications

Quantum Spin Hall Materials

Quantum Spin Hall Materials

Topological flat band, Dirac fermions and quantum spin Hall phase in 2D Archimedean lattices

Engineering Metal-spxy Dirac Bands on the Oxidized SiC Surface

Contact Info

Product

Resources

About

Evidence for a quantum spin Hall phase in graphene decorated with Bi ₂ Te ₃ nanoparticles

Engineering Metal-sp_xy Dirac Bands on the Oxidized SiC Surface