scholarly journals Strong light-matter coupling in topological metasurfaces integrated with transition metal dichalcogenides

2021 ◽  
Vol 2015 (1) ◽  
pp. 012142
Author(s):  
Ivan Sinev ◽  
Mengyao Li ◽  
Fedor Benimetskiy ◽  
Tatiana Ivanova ◽  
Svetlana Kiriushechkina ◽  
...  
Keyword(s):  
Transition Metal ◽  
Topological Charge ◽  
Transition Metal Dichalcogenides ◽  
Strong Coupling Regime ◽  
Strong Light ◽  
Matter Coupling ◽  
Spin Polarized ◽  
Exciton Polaritons ◽  
Metal Dichalcogenides ◽  
Quantum Phenomena

Abstract Strong light-matter interactions enable unique nonlinear and quantum phenomena at moderate light intensities. Within the last years, polaritonic metasurfaces emerged as a viable candidate for realization of such regimes. In particular, planar photonic structures integrated with 2D excitonic materials, such as transition metal dichalcogenides (TMD), can support exciton polaritons – half-light half-matter quasiparticles. Here, we explore topological exciton polaritons which are formed in a suitably engineered all-dielectric topological photonic metasurface coupled to TMD monolayers. We experimentally demonstrate the transition of topological charge from photonic to polaritonic bands with the onset of strong coupling regime and confirm the presence of one-way spin-polarized edge topological polaritons. The proposed system constitutes a promising platform for photonic/solid-state interfaces for valleytronics and spintronics.

scholarly journals Experimental observation of topological Z2 exciton-polaritons in transition metal dichalcogenide monolayers

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Mengyao Li ◽  
Ivan Sinev ◽  
Fedor Benimetskiy ◽  
Tatyana Ivanova ◽  
Ekaterina Khestanova ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Transition Metal Dichalcogenide ◽  
Strong Light ◽  
Strongly Coupled ◽  
Exciton Polaritons ◽  
Valley Polarization ◽  
Topological States ◽  
Metal Dichalcogenides ◽  
Quantum Science

AbstractThe rise of quantum science and technologies motivates photonics research to seek new platforms with strong light-matter interactions to facilitate quantum behaviors at moderate light intensities. Topological polaritons (TPs) offer an ideal platform in this context, with unique properties stemming from resilient topological states of light strongly coupled with matter. Here we explore polaritonic metasurfaces based on 2D transition metal dichalcogenides (TMDs) as a promising platform for topological polaritonics. We show that the strong coupling between topological photonic modes of the metasurface and excitons in TMDs yields a topological polaritonic Z2 phase. We experimentally confirm the emergence of one-way spin-polarized edge TPs in metasurfaces integrating MoSe2 and WSe2. Combined with the valley polarization in TMD monolayers, the proposed system enables an approach to engage the photonic angular momentum and valley and spin of excitons, offering a promising platform for photonic/solid-state interfaces for valleytronics and spintronics.

Self-Hybridized Exciton-Polaritons in Multilayers of Transition Metal Dichalcogenides for Efficient Light Absorption

ACS Photonics ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 139-147 ◽  
Author(s):  
Battulga Munkhbat ◽  
Denis G. Baranov ◽  
Michael Stührenberg ◽  
Martin Wersäll ◽  
Ankit Bisht ◽  
...  
Keyword(s):  
Transition Metal ◽  
Light Absorption ◽  
Transition Metal Dichalcogenides ◽  
Exciton Polaritons ◽  
Metal Dichalcogenides

scholarly journals Tunable Spin-Polarized Edge Currents in Proximitized Transition Metal Dichalcogenides

2019 ◽  
Vol 122 (8) ◽  
Author(s):  
Natalia Cortés ◽  
O. Ávalos-Ovando ◽  
L. Rosales ◽  
P. A. Orellana ◽  
S. E. Ulloa
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Spin Polarized ◽  
Metal Dichalcogenides

scholarly journals Polariton hyperspectral imaging of two-dimensional semiconductor crystals

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Christian Gebhardt ◽  
Michael Förg ◽  
Hisato Yamaguchi ◽  
Ismail Bilgin ◽  
Aditya D. Mohite ◽  
...  
Keyword(s):  
Hyperspectral Imaging ◽  
Transition Metal Dichalcogenides ◽  
Binding Energies ◽  
Strong Coupling Regime ◽  
Two Dimensional ◽  
Strong Light ◽  
Optical Cavities ◽  
Metal Dichalcogenides ◽  
High Level ◽  
Micro Cavity

Abstract Atomically thin crystals of transition metal dichalcogenides (TMDs) host excitons with strong binding energies and sizable light-matter interactions. Coupled to optical cavities, monolayer TMDs routinely reach the regime of strong light-matter coupling, where excitons and photons admix coherently to form polaritons up to room temperature. Here, we explore the two-dimensional nature of TMD polaritons with scanning-cavity hyperspectral imaging. We record a spatial map of polariton properties of extended WS2 monolayers coupled to a tunable micro cavity in the strong coupling regime, and correlate it with maps of exciton extinction and fluorescence taken from the same flake with the cavity. We find a high level of homogeneity, and show that polariton splitting variations are correlated with intrinsic exciton properties such as oscillator strength and linewidth. Moreover, we observe a deviation from thermal equilibrium in the resonant polariton population, which we ascribe to non-Markovian polariton-phonon coupling. Our measurements reveal a promisingly consistent polariton landscape, and highlight the importance of phonons for future polaritonic devices.

scholarly journals Atomic–layer–confined multiple quantum wells enabled by monolithic bandgap engineering of transition metal dichalcogenides

2021 ◽  
Vol 7 (13) ◽  
pp. eabd7921
Author(s):  
Yoon Seok Kim ◽  
Sojung Kang ◽  
Jae-Pil So ◽  
Jong Chan Kim ◽  
Kangwon Kim ◽  
...  
Keyword(s):  
Transition Metal ◽  
Quantum Wells ◽  
Building Block ◽  
Transition Metal Dichalcogenides ◽  
Atomic Layer ◽  
Band Alignment ◽  
Type I ◽  
Bandgap Engineering ◽  
Strong Light ◽  
Metal Dichalcogenides

Quantum wells (QWs), enabling effective exciton confinement and strong light-matter interaction, form an essential building block for quantum optoelectronics. For two-dimensional (2D) semiconductors, however, constructing the QWs is still challenging because suitable materials and fabrication techniques are lacking for bandgap engineering and indirect bandgap transitions occur at the multilayer. Here, we demonstrate an unexplored approach to fabricate atomic–layer–confined multiple QWs (MQWs) via monolithic bandgap engineering of transition metal dichalcogenides and van der Waals stacking. The WOX/WSe2 hetero-bilayer formed by monolithic oxidation of the WSe2 bilayer exhibited the type I band alignment, facilitating as a building block for MQWs. A superlinear enhancement of photoluminescence with increasing the number of QWs was achieved. Furthermore, quantum-confined radiative recombination in MQWs was verified by a large exciton binding energy of 193 meV and a short exciton lifetime of 170 ps. This work paves the way toward monolithic integration of band-engineered heterostructures for 2D quantum optoelectronics.

scholarly journals Exciton condensate in bilayer transition metal dichalcogenides: Strong coupling regime

2017 ◽  
Vol 96 (17) ◽  
Author(s):  
Bishwajit Debnath ◽  
Yafis Barlas ◽  
Darshana Wickramaratne ◽  
Mahesh R. Neupane ◽  
Roger K. Lake
Keyword(s):  
Transition Metal ◽  
Strong Coupling ◽  
Transition Metal Dichalcogenides ◽  
Strong Coupling Regime ◽  
Exciton Condensate ◽  
Metal Dichalcogenides

scholarly journals Manipulating spin-polarized photocurrents in 2D transition metal dichalcogenides

2016 ◽  
Vol 113 (14) ◽  
pp. 3746-3750 ◽  
Author(s):  
Lu Xie ◽  
Xiaodong Cui
Keyword(s):  
Transition Metal ◽  
Spin Polarization ◽  
Electric Fields ◽  
Optical Pumping ◽  
Transition Metal Dichalcogenides ◽  
Spin Valve ◽  
Optical Fields ◽  
Spin Polarized ◽  
Valve Structure ◽  
Metal Dichalcogenides

Manipulating spin polarization of electrons in nonmagnetic semiconductors by means of electric fields or optical fields is an essential theme of the conceptual nonmagnetic semiconductor-based spintronics. Here we experimentally demonstrate an electric method of detecting spin polarization in monolayer transition metal dichalcogenides (TMDs) generated by circularly polarized optical pumping. The spin-polarized photocurrent is achieved through the valley-dependent optical selection rules and the spin–valley locking in monolayer WS2, and electrically detected by a lateral spin–valve structure with ferromagnetic contacts. The demonstrated long spin–valley lifetime, the unique valley-contrasted physics, and the spin–valley locking make monolayer WS2 an unprecedented candidate for semiconductor-based spintronics.

Exciton polaritons in mixed-dimensional transition metal dichalcogenides heterostructures

2020 ◽  
Vol 45 (15) ◽  
pp. 4140
Author(s):  
Qing Zhang ◽  
Shaohua Dong ◽  
Guangtao Cao ◽  
Guangwei Hu
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenides ◽  
Exciton Polaritons ◽  
Metal Dichalcogenides
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