Circulating Currents and Magnetic Moments in Quantum Rings

Current Magnification and Circulating Currents in Mesoscopic Rings

We show that several novel effects related to persistent currents can arise in open systems, which have no analogue in closed or isolated systems. We have considered a system of a metallic ring coupled to two electron reservoirs. We show that in the presence of a transport current, persistent currents can flow in a ring even in the absence of magnetic field. This is related to the current magni...

Exchange Currents for Hypernuclear Magnetic Moments

The meson(K and π) exchange currents for the hypernuclear magnetic moments are calculated using the effective Lagrangian method. The seagull diagram, the mesonic diagram and the Σ-excitation diagram are considered. The Λ-N exchange magnetic moments for the 5ΛHe, 6 ΛHe and 6 ΛLi are calculated employing the harmonic oscillator shell model. It is found that the two-body correction is about -9% of...

Persistent and Radiation-Induced Currents in Distorted Quantum Rings

Oscillatory persistent currents in self-assembled quantum rings.

We report the direct measurement of the persistent current carried by a single electron by means of magnetization experiments on self-assembled InAs/GaAs quantum rings. We measured the first Aharonov-Bohm oscillation at a field of 14 T, in perfect agreement with our model based on the structural properties determined by cross-sectional scanning tunneling microscopy measurements. The observed os...

PERSISTENT CURRENTS and MAGNETIZATION in TWO-DIMENSIONAL MAGNETIC QUANTUM SYSTEMS

Persistent currents and magnetization are considered for a two-dimensional electron (or gas of electrons) coupled to various magnetic fields. Thermodynamic formulae for the magnetization and the persistent current are established and the “classical” relationship between current and magnetization is shown to hold for systems invariant both by translation and rotation. Applications are given, inc...