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5 papers · 2 filters
Quantum current magnification in a multi-channel mesoscopic ring
Swarnali Bandopadhyay, P. Singha Deo, A. M. Jayannavar
We have studied the current magnification effect in a multi-channel open mesoscopic ring. We show that the current magnification effect is robust even in the presence of several pr…
Hartman effect in presence of Aharanov Bohm flux
Swarnali Bandopadhyay, Raishma Krishnan, A. M. Jayannavar
The Hartman effect for the tunneling particle implies the independence of group delay time on the opaque barrier width, with superluminal velocities as a consequence. This effect i…
Understanding the Fano Resonance : through Toy Models
Swarnali Bandopadhyay, Binayak Dutta-Roy, H. S. Mani
The Fano Resonance, involving the mixing between a quasi-bound `discrete' state of an inelastic channel lying in the continuum of scattering states belonging to the elastic channel…
Quantum rings for beginners: Energy spectra and persistent currents
S. Viefers, P. Koskinen, P. Singha Deo +1
Theoretical approaches to one-dimensional and quasi-one-dimensional quantum rings with a few electrons are reviewed. Discrete Hubbard-type models and continuum models are shown to…
Larmor precession time, Wigner delay time and the local density of states in a quantum wire
P. Singha Deo
Buttiker-Thomas-Pretre (BTP) [Z. Phys B {\bf 94}, 133 (1994)] proposed that the concepts behind the Larmor clock tell us that it is possible to define exactly the local density of…