Influence of spin on the persistent current of strongly interacting electrons

Abstract

The lowest eigenenergies of few, strongly interacting electrons in a one--dimensional ring are studied in the presence of an impurity barrier. The persistent current $I$, periodic in an Aharonov--Bohm flux penetrating the ring, is strongly influenced by the electron spin. The impurity does not remove discontinuities in $I$ at zero temperature. The total electron spin of the ground state oscillates with the flux. Strong electron--electron interaction enhances $I$, albeit not up to the value of the clean ring which itself is smaller than $I$ for free electrons. $I$ disappears on a temperature scale that depends exponentially on the electron density. In the limit of very strong interaction the response to small fluxes is diamagnetic.

Latex file, 15 pages, 13 figures available in uuencoded PostScript from the author

References in corpus (1)

• Level Statistics and Localization for Two Interacting Particles in a Random Potential

Cited by in corpus (5)

• Random Matrix Theories in Quantum Physics: Common Concepts
• Photon-assisted transport in semiconductor nanostructures
• Effective charge-spin models for quantum dots
• Ground State Spin Structure of Strongly Interacting Disordered 1D Hubbard Model
• Orbital ferromagnetism in interacting few-electron dots with strong spin-orbit coupling