Quantum current magnification in a multichannel mesoscopic ring

Bandopadhyay, Swarnali ; Deo, P. Singha ; Jayannavar, A. M. (2004) Quantum current magnification in a multichannel mesoscopic ring Physical Review B: Condensed Matter and Materials Physics, 70 (7). 075315_1-075315_9. ISSN 1098-0121

PDF - Publisher Version

Official URL: http://link.aps.org/doi/10.1103/PhysRevB.70.075315

Related URL: http://dx.doi.org/10.1103/PhysRevB.70.075315


We have studied the current magnification effect in a multichannel open mesoscopic ring. We show that the current magnification effect is robust even in the presence of several propagating modes despite mode mixing and cancellation effects. The magnitude of circulating currents in the multichannel regime can be much larger than that in a single channel case. Impurities can enhance or degrade the current magnification effect depending sensitively on the system parameters. Circulating currents are mostly associated with Fano resonances in the total transport current. We further show that system-lead coupling qualitatively changes the current magnification effect.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
Keywords:Current Magnification; Multi-channel; Transport Current
ID Code:14351
Deposited On:12 Nov 2010 08:41
Last Modified:16 May 2016 23:20

Repository Staff Only: item control page