Neutrinos have occupied the center stage in particle physics for the past three decades. Naturally produced neutrinos from the sun, the atmosphere and Super Nova 1987 have provided many surprising results. These, I turn, led to the design of precision neutrino experiments with man made sources. For the past decade, such experiments have produced a wealth of data which have solved some of the problems but opened up others. I will review the recent developments and discuss what we can except in the next decade.
18/05/2012 at 4:00 pm
Dr P. K. Muduli University of Leipzig, Germany
Exp. Physics Seminar
Lecture Hall Block A, Institute of Physics
Document Date:
Spin-polarized tunneling and transport in meso-scale few-layer graphene devices
Spin-polarized tunneling and transport in meso-scale few-layer graphene devices
Abstract
Mesoscopic spintronic devices rely on injection, transport and detection of electron spin degree of freedom to provide functionality in addition to the charge of the electron. However, spin injection into a semiconductor suffer from the problem of conductivity mismatch. One of the interesting aspects of tunneling through an insulator sandwiched between two ferromagnets is that, the spin of the electron is conserved. Therefore, tunneling through an insulator can be used for spin injection into semiconductor without conductivity mismatch problem. Besides the spin polarization of electrodes, tunneling also depends on the type and quality of tunnel barrier. I will speak about magnetotransport properties of few-layer graphene and show how the quality of tunnel barrier can affect spin injection into few-layer graphene.
Mass of the nucleus plays decissive role in all nuclear phenomena like stability, decay, reaction with other nuclei, and abundances of various elements in nature originating from nucleosynthesis in stellar evolution. Therefore mass formula has occupied the centre stage of nuclear physics research since early days. Historically, the first model of nucleus is the celebrated Bethe Weizsacker Mass Formule proposed in mid 1930s soon after the discovery of nucleus. This talk will delibrate on the physics foundation and the status of various mass formulae developed so for in nuclear physics. It will also specifically focus on the Infinite Nuclear Matter mass formula developed in IOP over the years.
