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Spin current swapping and spin Hall effect in a 2DEG

Speaker: 
Roberto Raimondi (Roma Tre University, Italy)
Date: 
Wed, 28/10/2015 - 11:00am to 12:00pm
Location: 
Physics Conference Room (S11-02-07)
Host: 
Shaffique Adam
Event Type: 
Seminars

Abstract

In this talk I will present some of the results obtained over the last year about spin-orbit induced effects in a two-dimensional electron gas. At first I will discuss the spin current swapping effect according to which a spin current flowing in the i direction with spin polarization along the j axis is converted into a spin current flowing in the j direction with spin polarization along the i axis. I will analyze the circumstances under which to observe the effect and its connection with the spin Hall effect. As a second topic I will focus on the spin Hall effect due to the skew-scattering mechanism induced by phonon scattering. A comparison will be made with the standard skew-scattering due to impurities and the consequences for the temperature dependence of the spin Hall angle will be analyzed. Finally, I will present a model with a striped Rashba spin-orbit coupling, which could possibly be realized in LAO/STO interfaces. Such a non homogeneous spin-orbit coupling may give rise to a spin Hall effect robust with respect to impurity scattering.

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