Transition from spin-orbit to hyperfine interaction dominated spin relaxation in a cold fluid of dipolar excitons

Ran Finkelstein, Kobi Cohen, Benoit Jouault, Ken West, Loren N. Pfeiffer, Masha Vladimirova, Ronen Rapaport

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Abstract

We measure the spin-resolved transport of dipolar excitons in a biased GaAs double quantum well structure. From these measurements we extract both spin lifetime and mobility of the excitons. We find that below a temperature of 4.8K there is a sharp increase in the spin lifetime of the excitons, together with a sharp reduction in their mobility. Below a critical power the spin lifetime increases with increasing mobility and density, while above the critical power the opposite trend is observed. We interpret this transition as evidence of the interplay between two different spin dephasing mechanisms: at low mobility the dephasing is dominated by the hyperfine interaction with the lattice nuclei spins, while at higher mobility the spin-orbit interaction dominates and a Dyakonov-Perel spin relaxation takes over. The excitation power and temperature regime where the hyperfine interaction induced spin dephasing is observed correlates with the regime where a dark dipolar quantum liquid was reported recently on a similar sample.

Original languageAmerican English
Article number085404
JournalPhysical Review B
Volume96
Issue number8
DOIs
StatePublished - 2 Aug 2017

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

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