Ultrafast spectroscopy of the quantum Hall ferromagnet

DOI to cite this document:: 10.5283/epub.12195

Su, B. ; Schröter, Patrick ; Heitmann, Detlef ; Perakis, Ilias. E. ; Wegscheider, Werner ; Schüller, Christian

PDF
(182kB) - Repository staff only

Date of publication of this fulltext: 25 Jan 2010 13:18

Alternative links to fulltext:DOI

Details

Export bibliographical data

Abstract

We report ultrafast spectroscopy experiments at the ν=1 quantum Hall state of a high-mobility two-dimensional electron system in a GaAs single quantum well. By spectrally resolved four-wave-mixing measurements we investigate the coherent dynamics of photo-excited electron–hole pairs and find extraordinarily long decoherence times for electrons in the upper spin level around ν=1. We interpret the ...