PMID: 22587272May 17, 2012Paper

Optical spin injection and spin lifetime in Ge heterostructures

Physical Review Letters
F PezzoliGiovanni Isella

Abstract

We demonstrate optical orientation in Ge/SiGe quantum wells and study their spin properties. The ultrafast electron transfer from the center of the Brillouin zone to its edge allows us to achieve high spin polarizations and to resolve the spin dynamics of holes and electrons. The circular polarization degree of the direct gap photoluminescence exceeds the theoretical bulk limit, yielding ∼37% and ∼85% for transitions with heavy and light holes states, respectively. The spin lifetime of holes at the top of the valence band is estimated to be ∼0.5  ps and it is governed by transitions between light and heavy hole states. Electrons at the bottom of the conduction band, on the other hand, have a spin lifetime that exceeds 5 ns below 150 K. Theoretical analysis of the spin relaxation indicates that phonon-induced intervalley scattering dictates the spin lifetime of electrons.

References

Jun 15, 1993·Physical Review. B, Condensed Matter·M Z MaialleL J Sham
Jun 18, 1990·Physical Review Letters·T Uenoyama, L J Sham
Nov 17, 2001·Science·S A WolfD M Treger
Oct 9, 2002·Physical Review Letters·D J Hilton, C L Tang
May 18, 2007·Nature·Ian AppelbaumDouwe J Monsma
Aug 17, 2010·Nano Letters·En-Shao LiuEmanuel Tutuc
Sep 28, 2010·Physical Review Letters·Pengke Li, Hanan Dery
Jan 15, 2011·Physical Review Letters·Wei HanR K Kawakami
Oct 11, 2011·Physical Review Letters·Pengke Li, Hanan Dery

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Citations

Jun 9, 2014·The Journal of Chemical Physics·Matteo BertocchiStefano Ossicini
Jun 24, 2014·Nature Materials·Federico BottegoniMarco Finazzi
May 6, 2017·Physical Review Letters·F BottegoniM Finazzi
Jul 26, 2018·Scientific Reports·Sebastiano De CesariFabio Pezzoli
May 29, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·T Yu, M W Wu
Mar 19, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·F RortaisM Jamet
Feb 4, 2014·Physical Review Letters·Pengke LiIan Appelbaum
Nov 2, 2014·Physical Review Letters·Yang SongHanan Dery

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