Controlling spin polarization of a quantum dot via a helical edge state

Abstract

We investigate a Zeeman-split quantum dot (QD) containing a single spin 1/2 weakly coupled to a helical Luttinger liquid (HLL) within a generalized master equation approach. The HLL induces a tunable magnetization direction on the QD controlled by an applied bias voltage when the quantization axes of the QD and the HLL are noncollinear. The backscattering conductance (BSC) in the HLL is finite and shows a resonance feature when the bias voltage equals the Zeeman energy in magnitude. The observed BSC asymmetry in bias voltage directly reflects the quantization axis of the HLL spin.

6 pages, 4 figures

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Cited by in corpus (14)

• Generic helical edge states due to Rashba spin-orbit coupling in a topological insulator
• Optimal thermoelectricity with quantum spin-Hall edge states
• Helical edge transport in the presence of a magnetic impurity: the role of local anisotropy
• Helical spin thermoelectrics controlled by a side-coupled magnetic quantum dot in the quantum spin Hall state
• Unrestricted electron bunching at the helical edge
• Finite frequency backscattering current noise at a helical edge
• Current-induced switching of magnetic molecules on topological insulator surfaces
• Sub- to Super-Poissonian crossover of current noise in helical edge states coupled to a spin impurity in a magnetic field
• Resistively detected NMR as a probe of the topological nature of conducting edge/surface states
• Transport in quantum spin Hall edges in contact to a quantum dot
• Interference effects induced by a precessing easy-plane magnet coupled to a helical edge state
• Electrically-detected single-spin resonance with Quantum Spin Hall edge states
• Enhanced lifetimes of spin chains coupled to chiral edge states
• Finite-frequency admittance and noise of a helical edge coupled to a magnet