Electrically driven spin resonance in a bent disordered carbon nanotube

TL;DR

This paper presents a theoretical analysis of electrically driven spin resonance in bent disordered carbon nanotubes, revealing mechanisms for controlling complex spin-valley states relevant for quantum computing.

Contribution

It introduces a new theoretical framework exploiting nanotube bend and disorder for resonant spin control, aligning with recent experimental observations.

Findings

Spectrum simulation matches recent experimental data

Mechanism enables control of four-dimensional spin-valley space

Identifies physical features responsible for resonance phenomena

Abstract

Resonant manipulation of carbon nanotube valley-spin qubits by an electric field is investigated theoretically. We develop a new analysis of electrically driven spin resonance exploiting fixed physical characteristics of the nanotube: a bend and inhomogeneous disorder. The spectrum is simulated for an electron valley-spin qubit coupled to a hole valley-spin qubit and an impurity electron spin, and features that coincide with a recent measurement are identified. We show that the same mechanism allows resonant control of the full four-dimensional spin-valley space.