Nonreciprocal Transport of Exciton Polaritons in a Non-Hermitian Chain

Mandal, S.; Banerjee, R.; Ostrovskaya, Elena A.; Liew, Timothy Chi Hin

doi:10.1103/physrevlett.125.123902

Cited by 56 publications

(38 citation statements)

References 74 publications

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“…This includes spin bistability [5][6][7] and multistability 8 , switches 9,10 , optical spin Hall effect 11 , polarized solitons 12,13 and vortices [14][15][16] , spin bifurcation points 17 , and topological phases 18,19 . Different parts for polariton based spin circuitry have already been realized 9,10,[20][21][22] with some recent exciting theoretical proposals 23,24 , but many challenges remain to be solved. Optical applications such as data communication or sensing benefit from precise control over a laser's polarization and modulation speeds, ideally using nonresonant excitation schemes like spin-VCSELs [25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

All-Optical Linear-Polarization Engineering in Single and Coupled Exciton-Polariton Condensates

Gnusov

Sigurðsson²,

Töpfer³

et al. 2021

Phys. Rev. Applied

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We demonstrate all-optical linear polarization control in semiconductor microcavities using an exciton-polariton condensate in an elliptically shaped optical trap. The microcavity inherent TE-TM splitting lifts the pseudospin degeneracy of the anisotropic trap ground state. The emerging fine structure modes are shown to be polarized linearly parallel and perpendicular to the trap major axis. We demonstrate polariton condensation into the excited pseudospin mode with high degree of linear polarization which rotates as we rotate the trap. We then extend our study to a system of two coupled linearly polarized condensates and demonstrate rich spin dynamics reflecting spontaneous synchronization and high correlation between the condensate pseudospins as a function of pump parameters. Our findings show a new type of polarization control with exciting perspectives in both spinoptronics and studies on extended systems of interacting nonlinear optical elements with anisotropic coupling strength and adjustable fine structure.I.

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Section: Introductionmentioning

confidence: 99%

All-Optical Linear-Polarization Engineering in Single and Coupled Exciton-Polariton Condensates

Gnusov

Sigurðsson²,

Töpfer³

et al. 2021

Phys. Rev. Applied

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“…This confirms that the system can act as a feedback free unidirectional spin filter. This is also similar to the recently proposed non-reciprocal transport of polaritons in an elliptical pillar chain [220]. Although in that case the spin of the polaritons are not conserved.…”

Section: )supporting

confidence: 90%

Dynamics of light-matter coupled quasiparticles

Mandal¹

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guiding me throughout these years. I really appreciate his willingness to give his time so generously. He has been extremely calm and has a great insight in physics.I can not remember a single discussion where I did not learn anything new from him. I really consider myself lucky to have spent my PhD in his group.Next I would like to thank Prof. Kibis for his help during the initial phase of my PhD. He has helped me to improve my skills on the graphics immensely.

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“…3e and f, the transmission towards the right boundary almost vanishes, while the transmission towards the left boundary is significantly amplified. Such a phenomenon can be used to devise a unidirectional compact waveguide without relying on a large-size bulk to separate the one-way edge states as in Chern insulators 26 . Moreover, we also measure the field distributions in the acoustic crystal when the source is placed at different locations (e.g., the site 7, 10, 13) with operating frequency ω = 1713 Hz, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Acoustic non-Hermitian skin effect from twisted winding topology

Zhang

Yang

et al. 2021

Preprint

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The recently discovered non-Hermitian skin effect (NHSE) manifests the breakdown of current classification of topological phases in energy-nonconservative systems, and necessitates the introduction of non-Hermitian band topology. So far, all NHSE observations are based on one type of non-Hermitian band topology, in which the complex energy spectrum winds along a closed loop. As recently characterized along a synthetic dimension on a photonic platform, non-Hermitian band topology can exhibit almost arbitrary windings in momentum space, but their actual phenomena in real physical systems remain unclear. Here, we report the experimental realization of NHSE in a one-dimensional (1D) non-reciprocal acoustic crystal. With direct acoustic measurement, we demonstrate that a twisted winding, whose topology consists of two oppositely oriented loops in contact rather than a single loop, will dramatically change the NHSE, following previous predictions of unique features such as the bipolar localization and the Bloch point for a Bloch-wave-like extended state. This work reveals previously unnoticed features of NHSE, and provides the first observation of physical phenomena originating from complex non-Hermitian winding topology.

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Nonreciprocal Transport of Exciton Polaritons in a Non-Hermitian Chain

Cited by 56 publications

References 74 publications

All-Optical Linear-Polarization Engineering in Single and Coupled Exciton-Polariton Condensates

All-Optical Linear-Polarization Engineering in Single and Coupled Exciton-Polariton Condensates

Dynamics of light-matter coupled quasiparticles

Acoustic non-Hermitian skin effect from twisted winding topology

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