Quantum current magnification in a multichannel mesoscopic ring

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...

ENHANCEMENT of PERSISTENT CURRENT ON MULTICHANNEL RING

We describe a ”train” effect which may exist in small metallic and semiconductor rings and might be associated with the long-standing problem of the persistent current enhancement. The current is associated with the cooperative motion of N electrons constituing the N -electron ”train”. The train arises via an excitation or a backflow of spin waves or of interchannel charge density sound modes. ...

Quantum Transport: Persistent Current in Mesoscopic Loops

Quantum current modeling in nano-transistors with a quantum dot

Carbon quantum dots (CQDs) serve as a new class of ‘zero dimensional’ nanomaterial’s in thecarbon class with sizes below 10 nm. As light emitting nanocrystals, QDs are assembled from semiconductormaterials, from the elements in the periodic groups of II-VI, III-V or IV-VI, mainly thanks to impacts of quantum confinement QDs have unique optical properties such as brighter, highly pho...

Modulating unpolarized current in quantum spintronics: Visibility of spin-interference effects in multichannel Aharonov-Casher mesoscopic rings

The conventional unpolarized current injected into a quantum-coherent semiconductor ring attached to two non-magnetic external leads can be modulated from perfect conductor to perfect insulator limit via electrically tunable Rashba spin-orbit (SO) coupling, thereby avoiding the usage of any ferromagnetic elements or external magnetic fields. This requires that ballistic propagation of electrons...