Z2 peak of noise correlations in a quantum spin Hall insulator

Abstract

We investigate the current noise correlations at a quantum point contact in a quantum spin Hall structure, focusing on the effect of a weak magnetic field in the presence of disorder. For the case of two equally biased terminals we discover a robust peak: the noise correlations vanish at $B=0$ and are negative for $B\ne 0$. We find that the character of this peak is intimately related to the interplay between time reversal symmetry and the helical nature of the edge states and call it the Z2 peak.

4+epsilon pages, 3 figures

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Cited by in corpus (20)

• Detection of Majorana Kramers pairs using a quantum point contact
• Proposal for an on-demand source of polarized electrons into the edges of a topological insulator
• Electronic Hong-Ou-Mandel interferometry in two-dimensional topological insulators
• Nonlinear spin-thermoelectric transport in two-dimensional topological insulators
• Shot noise in the edge states of 2D topological insulators
• Current noise from a magnetic moment in a helical edge
• Transport phenomena in helical edge states interferometers. A Green's function approach
• Electronic quantum optics beyond the integer quantum Hall effect
• Noise and current correlations in tunnel junctions of Quantum Spin Hall edge states
• A Topological SQUIPT based on helical edge states in proximity to superconductors
• Probing helicity and the topological origins of helicity via non-local Hanbury-Brown and Twiss correlations
• Point contacts and localization in generic helical liquids
• $\pi$ Spin Berry Phase in a Quantum-Spin-Hall-Insulator-Based Interferometer: Evidence for the Helical Spin Texture of the Edge States
• Two-dimensional Fermionic Hong-Ou-Mandel Interference with Weyl Fermions
• Effects of disorder on electron tunneling through helical edge states
• Noise in the helical edge channel anisotropically coupled to a local spin
• Interaction effects in non-equilibrium transport properties of a four-terminal topological corner junction
• Emission of entangled Kramers pairs from a helical mesoscopic capacitor
• Wave-particle duality of electrons with spin-momentum locking
• Random-gate-voltage induced Al'tshuler-Aronov-Spivak effect in topological edge states