Electronic, magnetic and spintronic properties of quantum dots and quantum rings

International Conference and Exhibition on Mesoscopic & Condensed Matter Physics

June 22-24, 2015 Boston, USA

Ashok Chatterjee

University of Hyderabad, India

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

The talk will focus on some of the electronic, magnetic and spintronic properties of low-dimensional structures. First of all, the energetics of an off-centre neutral hydrogenic donor impurity trapped in a three-dimensional GaAs quantum dot with Gaussian confinement will be considered in the presence of a magnetic field and the effect of dot size and the impurity position on its binding energy will be discussed. The effect of Rashba interaction on the magnetization and electron susceptibility in the same GaAs quantum dot will also be discussed. Next the two-electron problem in a GaAs quantum dot will be considered in the presence of a magnetic field taking into account the spin of the electrons and the results for the low-lying energy levels and the spindependent persistent current obtained by the exact diagonalization method will be presented. Finally the persistent current will be calculated in a Holstein-Hubbard quantum ring threaded by an Aharonov-Bohm magnetic flux. It will be shown that the persistent current is suppressed by both the electron-electron and electron-phonon interactions. Our calculation reveals that the persistent current is diamagnetic and dies out continuously with increasing number of atoms in the ring. It will be predicted that there exists an intervening metallic phase in between the SDW and CDW phases whose width increases as the band becomes less than half-filled. This may have important implications in the context of superconductivity and nanotechnology.

Biography :

Ashok Chatterjee has carried out his Doctoral work at IACS, Kolkata and obtained his PhD from Jadavpur University, Kolkata in 1988. He did his Postdoctoral work at S N Bose National Centre for Basic Sciences, Kolkata and joined as a Lecturer at University of Hyderabad in 1990 where he eventually became a full Professor. He has visited several Universities and Institutes in India and abroad for collaboration and as a Visiting Professor. He has published around 100 papers in international journals of repute and is also serving as an Editorial Board Member of many journals.

Email: acsp@uohyd.ernet.in