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Spin relaxation in (110) and (001) InAs/GaSb superlattices
Journal article   Open access   Peer reviewed

Spin relaxation in (110) and (001) InAs/GaSb superlattices

K Hall, K Gundogdu, E Altunkaya, W Lau, Michael Flatte, Thomas Boggess, J Zinck, W Barvosa-Carter and S Skeith
Physical review. B, Condensed matter and materials physics, Vol.68(11), 1153115
01/07/2003
DOI: 10.1103/PhysRevB.68.115311
url
https://arxiv.org/pdf/cond-mat/0301080View
Open Access

Abstract

We report an enhancement of the electron spin relaxation time (T1) in a (110) InAs/GaSb superlattice by more than an order of magnitude (25 times) relative to the corresponding (001) structure. The spin dynamics were measured using polarization sensitive pump probe techniques and a mid-infrared, subpicosecond PPLN OPO. Longer T1 times in (110) superlattices are attributed to the suppression of the native interface asymmetry and bulk inversion asymmetry contributions to the precessional D'yakonov Perel spin relaxation process. Calculations using a nonperturbative 14-band nanostructure model give good agreement with experiment and indicate that possible structural inversion asymmetry contributions to T1 associated with compositional mixing at the superlattice interfaces may limit the observed spin lifetime in (110) superlattices. Our findings have implications for potential spintronics applications using InAs/GaSb heterostructures.
 Asymmetry Electron spin Heterostructures Relaxation time Spin dynamics Spintronics Superlattices

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