Robust platform for engineering pure-quantum-state transitions in polariton condensates

Askitopoulos, Alexis; Liew, Timothy Chi Hin; Ohadi, Hamid; Hatzopoulos, Z.; Savvidis, P. G.; Lagoudakis, Pavlos G.

doi:10.1103/physrevb.92.035305

Cited by 63 publications

(78 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using a non-resonant continuous wave (CW) linearly polarized pump spatially shaped in the form of an annular ring and focused on the sample surface through a 0.4 numerical aperture (NA) objective, we create the Ψ 00 coherent state in the optically induced trap, as shown schematically in Fig.1a [29]. The S + and S − components of the emission below and above threshold are resolved with the use of a λ/4 wave-plate and a linear polariser and are then used to reconstruct a real space image of the S z stokes component [30].…”

Section: Resultsmentioning

confidence: 99%

Nonresonant optical control of a spinor polariton condensate

et al. 2016

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Nonresonant optical control of a spinor polariton condensate

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Numerous examples of these interactions have been studied, ranging from polariton condensate interacting with an exciton reservoir in nonresonant excitation experiments [44][45][46][47][48][49] to spinor interactions in resonant [50][51][52][53][54][55] or nonresonant excitation [56,57]. They are, however, different in nature from the spinor effects induced by the effective magnetic field caused by TE-TM splitting of the microcavity mode [58][59][60] or by the birefringence field induced by disorder [61,62].…”

Section: Theoretical Modelmentioning

confidence: 99%

Spatial multistability induced by cross interactions of confined polariton modes

et al. 2016

View full text Add to dashboard Cite

We demonstrate the occurrence of spatial multistability using laterally confined microcavity exciton-polaritons. By coherently exciting with a blue detuned laser a series of confined polariton modes, we investigate the effects of multistability on the transmitted laser beam as a function of the excitation power. At each threshold of the hysteresis loop, a switching of the mode profile of the laser beam is associated with a significant energy jump of each of the confined polariton modes in the mesa. A simulation of this behavior is achieved with a multimode generalization of the Gross-Pitaevskii equations in the exciton photon basis. The mechanism behind the spatial multistability is identified as a repulsive cross interaction between polaritons in different modes.

show abstract

“…1(b,c)] and real-space images of the spatial probability distribution for the exciton-polariton condensate, as seen in Figs 1, 2 and 3. Above the threshold pump power, exciton-polaritons occupy multiple eigenstates of the optically defined trap222428293032 in the shape of the rectangular potential, which are resolved by analysing the spectrum of the photoluminescence with the aid of energy tomography. Here, the tomography refers to the process of the real-space imaging of the condensate probability density by capturing the near-field emission after it passes through the spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Visualising Berry phase and diabolical points in a quantum exciton-polariton billiard

Estrecho

Gao

Brodbeck

et al. 2016

Sci Rep

View full text Add to dashboard Cite

Diabolical points (spectral degeneracies) can naturally occur in spectra of two-dimensional quantum systems and classical wave resonators due to simple symmetries. Geometric Berry phase is associated with these spectral degeneracies. Here, we demonstrate a diabolical point and the corresponding Berry phase in the spectrum of hybrid light-matter quasiparticles—exciton-polaritons in semiconductor microcavities. It is well known that sufficiently strong optical pumping can drive exciton-polaritons to quantum degeneracy, whereby they form a macroscopically populated quantum coherent state similar to a Bose-Einstein condensate. By pumping a microcavity with a spatially structured light beam, we create a two-dimensional quantum billiard for the exciton-polariton condensate and demonstrate a diabolical point in the spectrum of the billiard eigenstates. The fully reconfigurable geometry of the potential walls controlled by the optical pump enables a striking experimental visualization of the Berry phase associated with the diabolical point. The Berry phase is observed and measured by direct imaging of the macroscopic exciton-polariton probability densities.

show abstract

Robust platform for engineering pure-quantum-state transitions in polariton condensates

Cited by 63 publications

References 38 publications

Nonresonant optical control of a spinor polariton condensate

Nonresonant optical control of a spinor polariton condensate

Spatial multistability induced by cross interactions of confined polariton modes

Visualising Berry phase and diabolical points in a quantum exciton-polariton billiard

Contact Info

Product

Resources

About