Edge states of hydrogen terminated monolayer materials: silicene, germanene and stanene ribbons

Hattori, Ayami; Tanaya, Sho; Yada, Keiji; Araidai, Masaaki; Sato, Masatoshi; Hatsugai, Yasuhiro; Shiraishi, Kenji; Tanaka, Yukio

doi:10.1088/1361-648x/aa57e0

Cited by 31 publications

(22 citation statements)

References 60 publications

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“…These behaviors are consistent with the continuum model in the vicinity of the would-be gapless points. Such a dependence of the boundary condition has been recently predicted to be observed in monolayer silicene/ germanene/stanene nanoribbons [19]. We remark that we obtain the edge state with positive and negative chiralities from the reduction p 1 !…”

Section: Lattice Systemsupporting

confidence: 83%

Analysis of Topological Material Surfaces

Kimura¹

2018

Heterojunctions and Nanostructures

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We provide a systematic analysis of the boundary condition for the edge state, which is a ubiquitous feature in topological phases of matter. We show how to characterize the boundary condition, and how the edge state spectrum depends on it, with several examples, including 2d topological insulator and 3d Weyl semimetal. We also demonstrate the edge-of-edge state localized at the intersection of boundaries.

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Section: Lattice Systemsupporting

confidence: 83%

Analysis of Topological Material Surfaces

Kimura¹

2018

Heterojunctions and Nanostructures

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“…In order to clearly exhibit the edge states and eliminate the finite size effect, the band structures for a large N=128 are calculated based on our TB model, as shown in figures 7(c) and (d). For a zigzag nanoribbon of the graphene series, it is worth noting that very recently the author in reference [60] developed a multi-orbital (s p p p , , ,…”

Section: Edge Magnetism Configurationsmentioning

confidence: 99%

Systematic study on stanene bulk states and the edge states of its zigzag nanoribbon

Abid

Liu

2017

New J. Phys.

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Stanene, as a counterpart of graphene, but with much larger spin-orbit coupling (SOC) strength, has recently been synthesized experimentally. Based on first principle calculations and an effective model, we systematically study the electronic and topological properties of bulk stanene under vertical electric field and biaxial strain, which can be naturally introduced by substrates. We find that a topological nontrivial-trivial transition occurs under a critical vertical electric field and an insulator-metal transition happens under critical biaxial strains. We also systematically study the edge state of zigzag nanoribbons. We find that the topological edge state has strong nonlinear dispersion that is different from the previous oversimplified tight-binding (TB) model. A much more practical TB model is built, which captures the strongly nonlinear dispersion of the edge states very well. We investigate four magnetic configurations of the zigzag ribbon edge states in detail and find that the emergence of magnetism for the edge atoms and the magnetization direction have a remarkable impact on the spincurrent-carrying edge channels. Furthermore, a half-metallic state can be induced in stanene nanoribbons by applying a transverse electric field, and opposite spin channels can be chosen by reversing the electric field direction. Our results are instructive for future research and applications on stanene and other related buckled systems.

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“…In recent years, a silicon analogue of graphene, silicene [5][6][7][8] consisting of a monolayer honeycomb structure of silicon atoms, has attracted an immense amount of research interest both theoretically 5,7 and experimentally [9][10][11][12] . This two-dimensional (2D) material has been grown experimentally by successful deposition of silicene sheet on silver substrate [9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Thermal conductance by Dirac fermions in a normal-insulator-superconductor junction of silicene

2016

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We theoretically study the properties of thermal conductance in a normal-insulatorsuperconductor junction of silicene for both thin and thick barrier limit. We show that while thermal conductance displays the conventional exponential dependence on temperature, it manifests a nontrivial oscillatory dependence on the strength of the barrier region. The tunability of the thermal conductance by an external electric field is also investigated. Moreover, we explore the effect of doping concentration on thermal conductance. In the thin barrier limit, the period of oscillations of the thermal conductance as a function of the barrier strength comes out be π/2 when doping concentration in the normal silicene region is small. On the other hand, the period gradually converts to π with the enhancement of the doping concentration. Such change of periodicity of the thermal response with doping can be a possible probe to identify the crossover from specular to retro Andreev reflection in Dirac materials. In the thick barrier limit, thermal conductance exhibits oscillatory behavior as a function of barrier thickness d and barrier height V0 while the period of oscillation becomes V0 dependent. However, amplitude of the oscillations, unlike in tunneling conductance, gradually decays with the increase of barrier thickness for arbitrary height V0 in the highly doped regime. We discuss experimental relevance of our results.

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Edge states of hydrogen terminated monolayer materials: silicene, germanene and stanene ribbons

Cited by 31 publications

References 60 publications

Analysis of Topological Material Surfaces

Analysis of Topological Material Surfaces

Systematic study on stanene bulk states and the edge states of its zigzag nanoribbon

Thermal conductance by Dirac fermions in a normal-insulator-superconductor junction of silicene

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