Optical spin injection and spin lifetime in Ge heterostructures

Fabio Pezzoli; Federico Bottegoni; Dhara Trivedi; Franco Ciccacci; Anna Giorgioni; Pengki Li; Stefano Cecchi; Emanuele Grilli; Yang Song; Mario Guzzi; Hanan Dery; Giovanni Isella

doi:10.1117/12.929204

9 October 2012 Optical spin injection and spin lifetime in Ge heterostructures

Fabio Pezzoli, Federico Bottegoni, Dhara Trivedi, Franco Ciccacci, Anna Giorgioni, Pengki Li, Stefano Cecchi, Emanuele Grilli, Yang Song, Mario Guzzi, Hanan Dery, Giovanni Isella

Author Affiliations +

Proceedings Volume 8461, Spintronics V; 84610P (2012) https://doi.org/10.1117/12.929204
Event: SPIE NanoScience + Engineering, 2012, San Diego, California, United States

Abstract

We studied spin properties of Ge heterostructures by optical orientation and Hanle measurements. The circular polarization of the direct gap photoluminescence is shown to exceed the theoretical bulk limit, yielding about 37% and 85% for transitions with heavy and light holes, respectively. The energetic proximity of Γ and L valleys and ultrafast scattering of electrons from Γ to L states allowed us to resolve the spin dynamics of holes and to observe the polarization of electrons after scattering to L valleys. The spin relaxation analysis indicates that the spin lifetime of electrons exceeds 5 ns below 150 K, whereas it is in the 500 ps range for holes.

Citation Download Citation

Fabio Pezzoli, Federico Bottegoni, Dhara Trivedi, Franco Ciccacci, Anna Giorgioni, Pengki Li, Stefano Cecchi, Emanuele Grilli, Yang Song, Mario Guzzi, Hanan Dery, and Giovanni Isella "Optical spin injection and spin lifetime in Ge heterostructures", Proc. SPIE 8461, Spintronics V, 84610P (9 October 2012); https://doi.org/10.1117/12.929204

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available