SPIN BEATS AND DYNAMICAL MAGNETIZATION IN QUANTUM STRUCTURES

Citation
Jj. Baumberg et al., SPIN BEATS AND DYNAMICAL MAGNETIZATION IN QUANTUM STRUCTURES, Physical review letters, 72(5), 1994, pp. 717-720
Citations number
13
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
72
Issue
5
Year of publication
1994
Pages
717 - 720
Database
ISI
SICI code
0031-9007(1994)72:5<717:SBADMI>2.0.ZU;2-4
Abstract
A femtosecond-resolved Faraday spectroscopy has been developed to dire ctly monitor spin dynamics in magnetically tunable semiconductor quant um wells. Tunable terahertz quantum beating of the optical polarizatio n is observed from coherent excitation of the spin states Zeeman split by a single ultrathin magnetic tunneling barrier. Subsequent spin-fli p scattering of photoinjected spin-polarized excitons deposits a magne tic ''imprint'' in the barrier which is orientation dependent and pers ists for orders of magnitude longer than the carrier lifetime.