Parity-locking effect in a strongly-correlated ring
Abstract
Description
Orbital magnetism in an integrable model of a multichannel ring with long-ranged electron-electron interactions is investigated. In a noninteracting multichannel system, the response to an external magnetic flux is the sum of many diamagnetic and paramagnetic contributions, but we find that for sufficiently strong correlations, the contributions of all channels add constructively, leading to a parity (diamagnetic or paramagnetic) which depends only on the total number of electrons. Numerical results confirm that this parity-locking effect is robust with respect to subband mixing due to disorder.
part of lecture presented in the conference ``Unconventional quantum liquids", appearing in Z. Phys
part of lecture presented in the conference ``Unconventional quantum liquids", appearing in Z. Phys