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Non-resonant optical control of a spinor polariton condensate

Non-resonant optical control of a spinor polariton condensate
Non-resonant optical control of a spinor polariton condensate
We investigate the spin dynamics of polariton condensates spatially separated from and effectively confined by the pumping exciton reservoir. We obtain a strong correlation between the ellipticity of the non-resonant optical pump and the degree of circular polarisation (DCP) of the condensate at the onset of condensation. With increasing excitation density we observe a reversal of the DCP. The
spin dynamics of the trapped condensate are described within the framework of the spinor complex Ginzburg-Landau equations in the Josephson regime, where the dynamics of the system are reduced to a current-driven Josephson junction. We show that the observed spin reversal is due to the interplay between an internal Josephson coupling effect and the detuning of the two projections of the spinor condensate via transition from a synchronised to a desynchronised regime. These results suggest that spinor polariton condensates can be controlled by tuning the non-resonant excitation density offering applications in electrically pumped polariton spin switches.
polariton condensate, spin, optical trap, polariton bec
1550-235X
1-9
Askitopoulos, Alexis
7ccee4f4-5ea2-408f-beb3-3ff5b281f4e4
Kalinin, Kirill
48370656-7ae5-4680-8da4-c81949602efd
Liew, T.C.H.
9c0a81ce-432d-46cf-ac38-749cf0e5b1d2
Cilibrizzi, Pasquale
87c472fd-4228-45dc-ac37-79209155c190
Hatzopoulos, Zacharias
6803e5ae-1159-45e0-ae5a-3d279acbc0f3
Savvidis, Pavlos G.
fef41541-a691-4df6-9ba6-2b86d3f85257
Berloff, Natalia
511a41c2-af79-47db-ba9d-86ee22242062
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf
Askitopoulos, Alexis
7ccee4f4-5ea2-408f-beb3-3ff5b281f4e4
Kalinin, Kirill
48370656-7ae5-4680-8da4-c81949602efd
Liew, T.C.H.
9c0a81ce-432d-46cf-ac38-749cf0e5b1d2
Cilibrizzi, Pasquale
87c472fd-4228-45dc-ac37-79209155c190
Hatzopoulos, Zacharias
6803e5ae-1159-45e0-ae5a-3d279acbc0f3
Savvidis, Pavlos G.
fef41541-a691-4df6-9ba6-2b86d3f85257
Berloff, Natalia
511a41c2-af79-47db-ba9d-86ee22242062
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf

Askitopoulos, Alexis, Kalinin, Kirill, Liew, T.C.H., Cilibrizzi, Pasquale, Hatzopoulos, Zacharias, Savvidis, Pavlos G., Berloff, Natalia and Lagoudakis, Pavlos G. (2016) Non-resonant optical control of a spinor polariton condensate. Physical Review B, 1-9. (In Press)

Record type: Article

Abstract

We investigate the spin dynamics of polariton condensates spatially separated from and effectively confined by the pumping exciton reservoir. We obtain a strong correlation between the ellipticity of the non-resonant optical pump and the degree of circular polarisation (DCP) of the condensate at the onset of condensation. With increasing excitation density we observe a reversal of the DCP. The
spin dynamics of the trapped condensate are described within the framework of the spinor complex Ginzburg-Landau equations in the Josephson regime, where the dynamics of the system are reduced to a current-driven Josephson junction. We show that the observed spin reversal is due to the interplay between an internal Josephson coupling effect and the detuning of the two projections of the spinor condensate via transition from a synchronised to a desynchronised regime. These results suggest that spinor polariton condensates can be controlled by tuning the non-resonant excitation density offering applications in electrically pumped polariton spin switches.

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Accepted/In Press date: 22 April 2016
Keywords: polariton condensate, spin, optical trap, polariton bec
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 393240
URI: https://eprints.soton.ac.uk/id/eprint/393240
ISSN: 1550-235X
PURE UUID: e92966b2-ee26-414d-a398-2c8610552a3b

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Date deposited: 04 May 2016 12:42
Last modified: 09 Jan 2018 18:10

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