Spin beats and dynamical magnetization in quantum structures

J. J. Baumberg, D. D. Awschalom, N. Samarth, H. Luo, J. K. Furdyna

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

A femtosecond-resolved Faraday spectroscopy has been developed to directly monitor spin dynamics in magnetically tunable semiconductor quantum wells. Tunable terahertz quantum beating of the optical polarization is observed from coherent excitation of the spin states Zeeman split by a single ultrathin magnetic tunneling barrier. Subsequent spin-flip scattering of a photoinjected spin-polarized excitons deposits a magnetic imprint in the barrier which is orientation dependent and persists for orders of magnitude longer than the carrier lifetime.

Original languageEnglish (US)
Pages (from-to)717-720
Number of pages4
JournalPhysical review letters
Volume72
Issue number5
DOIs
StatePublished - 1994

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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