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Colloqui di Fisica Charge and spin in a two-dimensional electron gas: always an exciting encounter Roberto Raimondi
02-05-2017 - 15:00
AULA B - Via Della Vasca Navale 84 Conventional electronics is based on the electron charge, whereas spintronics exploits the spin degree of freedom as, for instance, in GMR (giant magnetoresistance) devices.
Current research, both at fundamental and applied level, aims at efficiently combine charge and spin with the purpose of developing new functionalities and improved performances.
It is not surprising then that spin to charge interconversion phenomena, as the spin Hall (SHE) and the spin galvanic (SGE) effects, are intensively investigated in a number of different systems ranging from semiconductors to metals and complex insulating oxides.
In this talk I will start with a brief overview of the experimental setups developed to
measure the SHE and the SGE. Then, I will introduce the two main theoretical ingredients
at the basis of our theoretical understanding about the origin of these effects.
These are the modified symmetry conditions existing at surfaces and interfaces and the spin-orbit coupling, which in solid state systems manifests in a number of different ways.
Finally, I will show how it is possible to describe the SHE and SGE in terms of an effective non-abelian gauge theory, which allows to derive a set of transport and diffusion equations
for the coupled spin and charge dynamics.
org: RAIMONDI Roberto
Allegati: [LOCANDINA] |
