Growth of bilayer stanene on a magnetic topological insulator aided by a buffer layer

Abstract

Stanene, a two-dimensional counterpart to graphene, has the potential to exhibit novel quantum phenomena when grown on a magnetic topological insulator (MTI). This work demonstrates the formation of up to bilayer stanene on 30\% Sb-doped MnBi${}_2$Te${}_4$ (MBST), a well known MTI, albeit with a buffer layer (BL) in between. Angle-resolved photoemission spectroscopy (ARPES), when combined with density functional theory (DFT), reveals stanene related bands such as two hole-like bands and an inverted parabolic band around the $\overline{\Gamma }$ point. An outer hole-like band traverses the Fermi level (\ef) and gives rise to a hexagonal Fermi surface, showing that stanene on MBST is metallic. In contrast, a bandgap of 0.8 eV is observed at the $\overline{K}$ point. We find that DFT shows good agreement with ARPES only when the BL and hydrogen passivation of the top Sn layer are considered in the calculation. Scanning tunneling microscopy (STM) establishes the honeycomb buckled structure of stanene. A stanene-related component is also detected in the Sn $d$ core level spectra, in addition to a BL-related component. The BL, which forms because of the chemical bonding between Sn and the top two layers of MBST, has an ordered crystal lattice with random anti-site defects. The composition of the BL is estimated to be Sn:Te:Bi/Sb $\approx$ 2:1:1 from x-ray photoelectron spectroscopy. Low energy electron diffraction shows that the lattice constant of stanene is marginally larger than that of MBST, and the STM result aligns with this. The BL bridges this disparity and provides a platform for stanene growth.

arXiv comment*Both authors contributed equally

References in corpus (40)

• Electric Field Effect in Atomically Thin Carbon Films
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Quantum Spin Hall Effect in Silicene
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Epitaxial Growth of Two-Dimensional Stanene
• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Titanic Magnetoresistance in WTe2
• Low-energy effective Hamiltonian involving spin-orbit coupling in Silicene and Two-Dimensional Germanium and Tin
• Large-gap quantum spin Hall insulators in tin films
• Prediction and observation of the first antiferromagnetic topological insulator
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• Spintronics and Pseudospintronics in Graphene and Topological Insulators
• Superconductivity emerging from suppressed large magnetoresistant state in WTe2
• Higher-Order Topology, Monopole Nodal Lines, and the Origin of Large Fermi Arcs in Transition Metal Dichalcogenides XTe${}_2$ (X=Mo,W)
• Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
• Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure
• Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes
• Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1
• Superconductivity in Few-Layer Stanene
• Variety of magnetic topological phases in the (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_m$ family
• Topological Surface States and Dirac point tuning in ternary Bi2Te2Se class of topological insulators
• Evolution of structural, magnetic and transport properties in MnBi2-xSbxTe4
• Elemental topological Dirac semimetal: α-Sn on InSb(111)
• Enhanced superconducting pairing interaction in indium-doped tin telluride
• Strain-Induced Band Engineering in Monolayer Stanene on Sb(111)
• Aluminene as Highly Hole Doped Graphene
• Conversion of a conventional superconductor into a topological superconductor by topological proximity effect
• Crossover of Ising- to Rashba-Type Superconductivity in Epitaxial Bi2Se3/Monolayer NbSe2 Heterostructures
• Induced unconventional superconductivity on the surface states of Bi${}_2$Te${}_3$ topological insulator
• Evidence for a magnetic-field induced ideal type-II Weyl state in antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4
• Dissociative Adsorption of Molecules on Graphene and Silicene
• Spectroscopic realization of large surface gap in a doped magnetic topological insulator
• Electronic structure of Au-Sn compounds grown on Au(111)
• Large Itinerant Electron Exchange Coupling in the Magnetic Topological Insulator MnBi2Te4
• Charge density wave induced nodal lines in LaTe${}_3$
• Giant atomic swirl in graphene bilayers with biaxial heterostrain
• Quasiperiodic ordering in thick Sn layer on $i$-Al-Pd-Mn: A possible quasicrystalline clathrate
• Anti-site defect-induced disorder in compensated topological magnet MnBi${}_{2-x}$Sb${}_x$Te${}_4$
• Superconducting phase diagram and nontrivial band topology of structurally modulated Sn${}_{1-x}$Sb${}_x$
• High-buckled R3 stanene with topologically nontrivial energy gap

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