Spin Currents in a Coherent Exciton Gas

Spin Currents in a Coherent Exciton Gas

We report the observation of spin currents in a coherent gas of indirect excitons. The realized long-range spin currents originate from the formation of a coherent gas of bosonic pairs—a new mechanism to suppress the spin relaxation. The spin currents result in the appearance of a variety of polariz...

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Bibliographic Details
Main Authors: High, A. A., Hammack, A. T., Leonard, J. R., Yang, Sen, Butov, L. V., Ostatnický, T., Vladimirova, M., Kavokin, A. V., Liew, Timothy Chi Hin, Campman, K. L., Gossard, A. C.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2017
Subjects:
Excitons
Spin currents
Online Access:https://hdl.handle.net/10356/85902
http://hdl.handle.net/10220/43887
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Institution: Nanyang Technological University
Language: English
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Summary:We report the observation of spin currents in a coherent gas of indirect excitons. The realized long-range spin currents originate from the formation of a coherent gas of bosonic pairs—a new mechanism to suppress the spin relaxation. The spin currents result in the appearance of a variety of polarization patterns, including helical patterns, four-leaf patterns, spiral patterns, bell patterns, and periodic patterns. We demonstrate control of the spin currents by a magnetic field. We also present a theory of coherent exciton spin transport that describes the observed exciton polarization patterns and indicates the trajectories of the spin currents.

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