Kondo Tunneling into a Quantum Spin Hall Insulator

Abstract

The physics of a junction composed of a normal metal, quantum dot and 2D topological insulator (in a quantum spin Hall state) is elucidated. It maifests a subtle combination of Kondo correlations and quantum spin Hall edge states moving on the opposite sides of the 2D topological insulator. In a narrow strip geometry these edge states interact and a gap opens in the edge state spectrum. Consequently, Kondo screening is less effective and that affects electron transport through the junction. Specifically, when edge state coupling is strong enough, the tunneling differential conductance develops a dip at zero temperature instead of the standard zero bias Kondo peak.

6 two-column pages, 4 .eps figures

References in corpus (12)

• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Topological Insulators with Inversion Symmetry
• Classification of topological insulators and superconductors in three spatial dimensions
• Floquet Topological Insulator in Semiconductor Quantum Wells
• Topological Defects and Gapless Modes in Insulators and Superconductors
• Quantum Anomalous Hall Effect in Hg${}_{1-y}$Mn${}_y$Te Quantum Wells
• Realistic Time-Reversal Invariant Topological Insulators With Neutral Atoms
• Engineering Time-Reversal Invariant Topological Insulators With Ultra-Cold Atoms
• Helical Luttinger liquid in topological insulator nanowires
• Metal-Quantum Dot-Topological Superconductor Junction: Kondo correlations and Majorana Bound States
• Transition between ordinary and topological insulator regimes in two-dimensional resonant magnetotransport

Cited by in corpus (2)

• Spin-helical transport in normal and superconducting topological insulators
• Multi-channel Kondo impurity dynamics in a Majorana device