2019/12/11 by Gianluca Francica, Francica, Gianluca, Paola Gentile +3
Engineering · Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.1912.05602
openalex publication_date 2019/12/11 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28
We study the effects of a Zeeman magnetic field on the electron transport of\none-dimensional quantum rings which are marked by electronic states with\nd-orbital symmetry in the presence of spin-orbit and orbital Rashba\ncouplings. By considering phase-coherent propagation, we analyse the geometric\nAharonov-Anandan (AA) phase of the channels which is acquired in a closed path,\nby demonstrating that the orbital polarization can influence the electronic\ntransport when amplitude and magnetic field directions are varied. We explore\nall the possible cases for the injection of electrons at various energies in\nthe regime of low electron filling. The magnetic field can allow the selection\nof only one channel where the transmission is uniquely affected by the AA\nphase. Conversely, when more orbital channels are involved there is also a\ndynamical contribution that lead to oscillations in the transmission as the\nmagnetic field is varied. In particular, the transmission is chiral when the\nenergy states are close to the absolute minimum of the energy bands. Instead,\nwhen an interference between the channels occurs the orbital and spin\ncontributions tend to balance each other with the increasing of the magnetic\nfield amplitude resulting in a trivial AA phase. This saturation effect does\nnot occur in the high magnetic field regime when orbital and spin properties of\nthe channels exhibit sharp variations with direct consequences on the\ntransport.\n