Graphene-based heterojunction between two topological insulators

Abstract

Quantum Hall (QH) and quantum spin Hall (QSH) phases have very different edge states and, when going from one phase to the other, the direction of one edge state must be reversed. We study this phenomena in graphene in presence of a strong perpendicular magnetic field on top of a spin-orbit (SO) induced QSH phase. We show that, below the SO gap, the QSH phase is virtually unaffected by the presence of the magnetic field. Above the SO gap, the QH phase is restored. An electrostatic gate placed on top of the system allows to create a QSH-QH junction which is characterized by the existence of a spin-polarized chiral state, propagating along the topological interface. We find that such a setup naturally provides an extremely sensitive spin-polarized current switch.

10 pages, 5 figures

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• Proximity Effects in Topological Insulator Heterostructures
• Quantum transport in graphene Hall bars: Effects of vacancy disorder
• Phase diagrams and edge-state transitions in graphene with spin-orbit coupling and magnetic and pseudomagnetic fields
• Proposal for an ac spin current source
• Breakdown of topological protection due to non-magnetic edge disorder in two-dimensional materials in the Quantum Spin Hall phase
• Two-dimensional Weyl nodal-line semimetal and antihelical edge states in a modified Kane-Mele model
• Understanding magnetic focusing in graphene $p$-$n$ junctions through quantum modeling
• Topological properties of the mesoscopic graphene plaquette: QSHE due to spin imbalance
• Helical edge states in silicene and germanene nanorings in perpendicular magnetic field
• Robust propagating in-gap modes due to spin-orbit domain walls in graphene
• Edge states in proximitized graphene ribbons and flakes in a perpendicular magnetic field: emergence of lone pseudohelical pairs and pure spin-current states
• The emergence of interface states in graphene/transition metal dichalcogenides heterostructure with lateral interface
• Investigating transverse Hall conductances using two-terminal setups
• Anisotropic transport properties in prismatic topological insulator nanowires
• Competing topological phases in few-layer graphene