Topological, Valleytronic, and Optical Properties of Monolayer PbS

Wan, Wenhui; Yao, Yugui; Sun, Lixing; Liu, Cheng-Cheng; Zhang, Fan

doi:10.1002/adma.201604788

Cited by 28 publications

(39 citation statements)

References 55 publications

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“…Lattice vectors are relaxed until the stress is less than 0.01 GPa. Our firstprinciples calculations show that the buckled phase of the PbX monolayer is more stable than the centrosymmetric planar phase 8 , consistent with other DFT studies 16,48 . Detailed discussions on the bistable nature, ferroelectric properties and orbital-spin texture properties of lead chalcogenides can be found in our previous paper 8 .…”

Section: Discussionsupporting

confidence: 90%

Strain-induced gauge and Rashba fields in ferroelectric Rashba lead chalcogenide PbX monolayers ( X=S , Se, Te)

et al. 2018

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One of the exciting features of two-dimensional (2D) materials is their electronic and optical tunability through strain engineering. Previously we found a new class of 2D ferroelectric Rashba semiconductors PbX (X=S, Se, Te) with tunable spin-orbital properties. In this work, based on our previous tight-binding (TB) results, we derive an effective low-energy Hamiltonian around the symmetry points that captures the effects of strain on the electronic properties of PbX. We find that strains induce gauge fields which shift the Rashba point and modify the Rashba parameter. This effect is equivalent to the application of in-plane magnetic fields. The out-of-plane strain, which is proportional to the electric polarization, is also shown to modify the Rashba parameter. Overall, our theory connects strain and spin-splitting in ferroelectric Rashba materials, which will be important to understand the strain-induced variations in local Rashba parameters that will occur in practical applications.

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Section: Discussionsupporting

confidence: 90%

Strain-induced gauge and Rashba fields in ferroelectric Rashba lead chalcogenide PbX monolayers ( X=S , Se, Te)

et al. 2018

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“…Here we show that a second-order TSC in class DIII (i.e., time-reversal-invariant) can be realized by proxim- itizing a 2D TI [40][41][42] with an s ± -wave superconductor [43][44][45], as sketched in Fig. 1a.…”

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confidence: 82%

High-Temperature Majorana Corner States

et al. 2018

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Majorana bound states often occur at the end of 1D topological superconductor or at the π Josephson junction mediated by a helical edge state. Validated by a new bulk invariant and an intuitive edge argument, we show the emergence of one Majorana Kramers pair at each corner of a square-shaped 2D topological insulator proximitized by an s±-wave (e.g., Fe-based) superconductor. We obtain a phase diagram that emphasizes the roles of bulk parameters and edge orientations. We propose several experimental realizations in lattice-matched candidate materials. Our scheme offers a high-temperature platform for exploring higher-order non-Abelian quasiparticles.

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“…Very recently, several studies have investigated topological properties of the rock salt structure materials, such as PbX (X=Se, S, Te), in both monolayer and bilayer forms with no buckling [3,4,17]. In particular, Chang et al have successfully grown few-layer SnTe and PbTe [18] [19].…”

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confidence: 99%

Two-dimensional square buckled Rashba lead chalcogenides

et al. 2017

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We propose the lead sulphide (PbS) monolayer as a 2D semiconductor with a large Rashba-like spin-orbit effect controlled by the out-of-plane buckling. The buckled PbS conduction band is found to possess Rashba-like dispersion and spin texture at the M and Γ points, with large effective Rashba parameters of λ ∼ 5 eVÅ and λ ∼ 1 eVÅ, respectively. Using a tight-binding formalism, we show that the Rashba effect originates from the very large spin-orbit interaction and the hopping term that mixes the in-plane and out-of-plane p orbitals of Pb and S atoms. The latter, which depends on the buckling angle, can be controlled by applying strain to vary the spin texture as well as the Rashba parameter at Γ and M . Our density functional theory results together with tight-binding formalism provide a unifying framework for designing Rashba monolayers and for manipulating their spin properties.Introduction-Over the past two decades there has been a growing interest in materials with strong spin-orbit interaction (SOI), as they are of a profound importance for fundamental understanding of quantum phenomena at the atomic level and applications to spintronics. This relativistic interaction is linked to important effects such as Rashba, Zeeman, spin-Hall effect, and topological insulator (TI) states [1][2][3][4].

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Topological, Valleytronic, and Optical Properties of Monolayer PbS

Cited by 28 publications

References 55 publications

Strain-induced gauge and Rashba fields in ferroelectric Rashba lead chalcogenide PbX monolayers ( X=S , Se, Te)

Strain-induced gauge and Rashba fields in ferroelectric Rashba lead chalcogenide PbX monolayers ( X=S , Se, Te)

High-Temperature Majorana Corner States

Two-dimensional square buckled Rashba lead chalcogenides

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