Spin and Orbital Splitting in Ferromagnetic Contacted Single Wall Carbon Nanotube Devices

TL;DR

This study investigates how ferromagnetic contacts influence spin and orbital splitting in single wall carbon nanotube devices, revealing magnetic field effects on Coulomb blockade and orbital states at low temperatures.

Contribution

It demonstrates the suppression and enhancement of conductance due to magnetic field-induced orbital state splitting in ferromagnetically contacted nanotubes, a novel observation.

Findings

Coulomb blockade observed in ferromagnetic contacted nanotubes

Orbital state splitting affected by magnetic field up to 2 Tesla

Conductance modulation linked to orbital state dynamics

Abstract

We observed the coulomb blockade phenomena in ferromagnetic contacting single wall semiconducting carbon nanotube devices. No obvious Coulomb peaks shift was observed with existing only the Zeeman splitting at 4K. Combining with other effects, the ferromagnetic leads prevent the orbital spin states splitting with magnetic field up to 2 Tesla at 4K. With increasing magnetic field further, both positive or negative coulomb peaks shift slopes are observed associating with clockwise and anticlockwise orbital state splitting. The strongly suppressed/enhanced of the conductance has been observed associating with the magnetic field induced orbital states splitting/converging.