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Valley polarized relaxation and upconversion luminescence from Tamm-Plasmon Trion-Polaritons with a MoSe2 monolayer

Valley polarized relaxation and upconversion luminescence from Tamm-Plasmon Trion-Polaritons with a MoSe2 monolayer
Valley polarized relaxation and upconversion luminescence from Tamm-Plasmon Trion-Polaritons with a MoSe2 monolayer
Transition metal dichalcogenides represent an ideal testbed to study excitonic effects, spin-related phenomena and fundamental light-matter coupling in nanoscopic condensed matter systems. In particular, the valley degree of freedom, which is unique to such direct band gap monolayers with broken inversion symmetry, adds fundamental interest in these materials. Here, we implement a Tamm-plasmon structure with an embedded MoSe2 monolayer and study the formation of polaritonic quasi-particles. Strong coupling conditions between the Tamm-mode and the trion resonance of MoSe2 are established, yielding bright luminescence from the polaritonic ground state under non-resonant optical excitation. We demonstrate, that tailoring the electrodynamic environment of the monolayer results in a significantly increased valley polarization. This enhancement can be related to change in recombination dynamics shown in time-resolved photoluminescence measurements. We furthermore observe strong upconversion luminescence from resonantly excited polariton states in the lower polariton branch. This upconverted polariton luminescence is shown to preserve the valley polarization of the trion-polariton, which paves the
way towards combining spin-valley physics and exciton scattering experiments.
Lundt, N.
25b2f169-c96d-4f8f-bff5-a8feab60927d
Nagler, P.
2d26cae1-483a-4a07-a3d5-1a86ed154f38
Nalitov, A.
3bc0fc10-7645-44e3-b8be-ca4114104680
Kavokin, A.
70ffda66-cfab-4365-b2db-c15e4fa1116b
Lundt, N.
25b2f169-c96d-4f8f-bff5-a8feab60927d
Nagler, P.
2d26cae1-483a-4a07-a3d5-1a86ed154f38
Nalitov, A.
3bc0fc10-7645-44e3-b8be-ca4114104680
Kavokin, A.
70ffda66-cfab-4365-b2db-c15e4fa1116b

Lundt, N., Nagler, P., Nalitov, A. and Kavokin, A. (2017) Valley polarized relaxation and upconversion luminescence from Tamm-Plasmon Trion-Polaritons with a MoSe2 monolayer. 2D Materials. (In Press)

Record type: Article

Abstract

Transition metal dichalcogenides represent an ideal testbed to study excitonic effects, spin-related phenomena and fundamental light-matter coupling in nanoscopic condensed matter systems. In particular, the valley degree of freedom, which is unique to such direct band gap monolayers with broken inversion symmetry, adds fundamental interest in these materials. Here, we implement a Tamm-plasmon structure with an embedded MoSe2 monolayer and study the formation of polaritonic quasi-particles. Strong coupling conditions between the Tamm-mode and the trion resonance of MoSe2 are established, yielding bright luminescence from the polaritonic ground state under non-resonant optical excitation. We demonstrate, that tailoring the electrodynamic environment of the monolayer results in a significantly increased valley polarization. This enhancement can be related to change in recombination dynamics shown in time-resolved photoluminescence measurements. We furthermore observe strong upconversion luminescence from resonantly excited polariton states in the lower polariton branch. This upconverted polariton luminescence is shown to preserve the valley polarization of the trion-polariton, which paves the
way towards combining spin-valley physics and exciton scattering experiments.

Text
Valley polarized relaxation and upconversion luminescence from Tamm-Plasmon Trion-Polaritons with a MoSe2 monolayer - Accepted Manuscript
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Accepted/In Press date: 24 April 2017

Identifiers

Local EPrints ID: 412124
URI: http://eprints.soton.ac.uk/id/eprint/412124
PURE UUID: b6a27865-d5ac-4a29-8b82-fb15c746e521

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Date deposited: 11 Jul 2017 16:31
Last modified: 22 Nov 2021 05:32

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Contributors

Author: N. Lundt
Author: P. Nagler
Author: A. Nalitov
Author: A. Kavokin

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