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Zeitschrift für Physik B Condensed Matter
ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)
Abstract Volume 103 Issue 2 (1997) pp 323-325
Parity-locking effect in a strongly-correlated ring
C.A. Stafford (1), D.F. Wang (2)
(1) Institut de Physique Théorique, Université de Fribourg, CH-1700 Fribourg, Switzerland
(2) Institut de Physique Théorique, EPF Lausanne, CH-1015 Lausanne, Switzerland
Abstract. 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.
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