Second-Order Topological Insulator in van der Waals Heterostructures of CoBr${}_2$/Pt${}_2$HgSe${}_3$/CoBr${}_2$

Abstract

Second-order topological insulator, which has (d-2)-dimensional topological hinge or corner states, has been observed in three-dimensional materials, but has yet not been observed in two-dimensional system. In this Letter, we theoretically propose the realization of second-order topological insulator in the van der Waals heterostructure of CoBr${}_2$/Pt${}_2$HgSe${}_3$/CoBr${}_2$. Pt${}_2$HgSe${}_3$ is a large gap ${\mathbb{Z}}_2$ topological insulator. With in-plane exchange field from neighboring CoBr${}_2$, a large band gap above 70 meV opens up at the edge. The corner states, which are robust against edge disorders and irregular shapes, are confirmed in the nanoflake. We further show that the second-order topological states can also be realized in the heterostructure of jacutingaite family ${\mathbb{Z}}_2$ topological insulators. We believe that our work will be beneficial for the experimental realization of second-order topological insulators in van der Waals layered materials.

References in corpus (52)

• Van der Waals heterostructures
• 2D materials and van der Waals heterostructures
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Quantized Electric Multipole Insulators
• Higher-Order Topological Insulators
• Electric Multipole Moments, Topological Multipole Moment Pumping, and Chiral Hinge States in Crystalline Insulators
• $(d-2)$-dimensional edge states of rotation symmetry protected topological states
• Reflection symmetric second-order topological insulators and superconductors
• Higher-order topological insulators and semimetals on the breathing Kagome and pyrochlore lattices
• Higher-Order Topology in Bismuth
• Quantization of fractional corner charge in $C_n$-symmetric higher-order topological crystalline insulators
• Higher-order topological insulators and superconductors protected by inversion symmetry
• Second-order topological insulators and superconductors with an order-two crystalline symmetry
• Structural and electronic properties of germanene on MoS${}_2$
• Higher-order Topology of Axion Insulator EuIn${}_2$As${}_2$
• Two-dimensional second-order topological insulator in graphdiyne
• Higher-order bulk-boundary correspondence for topological crystalline phases
• Surface State Magnetization and Chiral Edge States on Topological Insulators
• Higher-Order Topological Insulator in Twisted Bilayer Graphene
• Robust zero-energy modes in an electronic higher-order topological insulator: the dimerized Kagome lattice
• Higher-Order Topological Insulators in Quasicrystals
• Impurity Bound States and Greens Function Zeroes as Local Signatures of Topology
• Higher Order Topological Phases: A General Principle of Construction
• Möbius Insulator and Higher-Order Topology in MnBi${}_{2n}$Te${}_{3n+1}$
• Helical Topological Edge States in a Quadrupole Phase
• Higher-order topological insulators protected by inversion and rotoinversion symmetries
• Minimal model for higher-order topological insulators and phosphorene
• Engineering Corner States from Two-Dimensional Topological Insulators
• Material design with the van der Waals stacking of bismuth-halide chains realizing a higher-order topological insulator
• Two-dimensional higher-order topology in monolayer graphdiyne
• Universal Approach to Magnetic Second-Order Topological Insulator
• Symmetry Enforced Chiral Hinge States and Surface Quantum Anomalous Hall Effect in Magnetic Axion Insulator ${\text{Bi}}_{2-x}{\text{Sm}}_x{\text{Se}}_3$
• Lattice models with exactly solvable topological hinge and corner states
• Higher-order topological insulators in amorphous solids
• Prediction of a large-gap and switchable Kane-Mele quantum spin Hall insulator
• Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators
• Abundance of ${\mathbb{Z}}_2$ topological order in exfoliable two-dimensional insulators
• Higher-order Topological Mott Insulators
• Coupling between Exciton-Polariton Corner Modes through Edge States
• Higher-Order topological insulator in a dodecagonal quasicrystal
• Bulk and surface electronic structure of the dual-topology semimetal Pt2HgSe3
• Higher-order topological insulators and semimetals in generalized Aubry-André-Harper models
• Classification and construction of higher-order symmetry protected topological phases of interacting bosons
• Signature of large-gap quantum spin Hall state in the layered mineral jacutingaite
• Dual topology in Jacutingaite Pt${}_2$HgSe${}_3$
• Type-II quadrupole topological insulators
• Emergent dual topology in the three-dimensional Kane-Mele Pt${}_2$HgSe${}_3$
• Higher-order Fabry-Pérot Interferometer from Topological Hinge States
• Saddle-point von Hove singularity and dual topological insulator state in Pt${}_2$HgSe${}_3$
• Jacutingaite-family: a class of topological materials

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• Higher-order topological phases in crystalline and non-crystalline systems: a review
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• Engineering topologically protected zero-dimensional interface end states in antiferromagnetic heterojunction graphene nanoflakes
• The General Principle behind Magnetization-induced Second-Order Topological Corner States in the Kane-Mele Model
• Altermagnetism Induced Topological Phase Transitions in Kane-Mele Model
• Higher-order topology in twisted multilayer systems: a review
• Ferroelectric polarization controlled orbital Hall conductivity in a higher-order topological insulator: \textit{d1T}-phase monolayer MoS${}_2$
• Topological Corner States in Bilayer and Trilayer Systems with Vertically Stacked Topological Heterostructures