Interplay of chiral and helical states in a Quantum Spin Hall Insulator lateral junction
arXiv:1702.08561 · doi:10.1103/PhysRevLett.119.226401
Abstract
We study the electronic transport across an electrostatically-gated lateral junction in a HgTe quantum well, a canonical 2D topological insulator, with and without applied magnetic field. We control carrier density inside and outside a junction region independently and hence tune the number and nature of 1D edge modes propagating in each of those regions. Outside the 2D gap, magnetic field drives the system to the quantum Hall regime, and chiral states propagate at the edge. In this regime, we observe fractional plateaus which reflect the equilibration between 1D chiral modes across the junction. As carrier density approaches zero in the central region and at moderate fields, we observe oscillations in resistance that we attribute to Fabry-Perot interference in the helical states, enabled by the broken time reversal symmetry. At higher fields, those oscillations disappear, in agreement with the expected absence of helical states when band inversion is lifted.
arXiv comment5 pages, 4 figures, supp. mat
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Cited by in corpus (8)
- Dynamical separation of bulk and edge transport in HgTe-based 2D topological insulators
- Living on the edge: Topology, electrostatics and disorder
- Fabry-Pérot resonant vortices and magnetoconductance in topological insulator constrictions with magnetic barriers
- Velocity and confinement of edge plasmons in HgTe-based 2D topological insulators
- Time-resolved measurement of ambipolar edge magnetoplasmon transport in InAs/InGaSb composite quantum wells
- Quantum transport of Dirac fermions in HgTe gapless quantum wells
- Effects of the Vertices on the Topological Bound States in a Quasicrystalline Topological Insulator
- Anomalous flux periodicity in proximitised quantum spin Hall constrictions