Controllable spin singlet - spin triplet transition in three concentric quantum rings through magnetic field and confinement potential

TL;DR

This paper theoretically investigates electron spectra in triple concentric quantum rings, revealing controllable spin singlet-triplet transitions influenced by magnetic fields and confinement potentials, with implications for quantum control.

Contribution

It introduces a detailed theoretical analysis of spin state transitions in triple quantum rings, highlighting the effects of magnetic fields and confinement on electron spin states.

Findings

Spin singlet to triplet transitions depend on magnetic field and confinement.

The period of transitions is independent of the Landé g-factor.

A fractional Aharonov-Bohm effect is observed.

Abstract

We present a theoretical study of the spectrum of electrons confined in triple concentric rings. An unusual ordering and rich variety of angular momentum transitions are found that depend on the coupling between the rings and the confinement potential of the rings. Using the Configuration Interaction (CI) method, we calculated the two electron energy spectrum. Spin singlet to spin triplet transitions of the electron ground state are predicted and a fractional Aharonov-Bohm effect is found. We show that both the period and amplitude of the spin singlet - triplet energy gap depend strongly on the confinement potential and the external magnetic field. The spin singlet - triplet transition is found to depend on the spin Zeeman energy, especially for rings with weak confinement and in the presence of large magnetic field. The amplitude of the spin singlet - triplet energy gap depends on the Land\'{e} $g$-factor but the period of the transitions is independent of $g$.