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Proceedings Paper

Spin and valley polarization in MoS2, MoSe2, and WSe2 monolayers (Conference Presentation)
Author(s): Cedric Robert; Gang Wang; Fabian Cadiz; Andréa Balocchi; Mikhail M. Glazov; Thierry Amand; Iann Gerber; Delphine Lagarde; Bernhard Urbaszek; Xavier Marie
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Paper Abstract

The spectacular progress in controlling the electronic properties of graphene has triggered research in alternative atomically thin two-dimensional crystals. Monolayers (ML) of transition-metal dichalcogenides such as MoS2 have emerged as very promising nanostructures for optical and spintronics applications. Inversion symmetry breaking together with the large spin-orbit interaction leads to a coupling of carrier spin and k-space valley physics, i.e., the circular polarization (σ+ or σ−) of the absorbed or emitted photon can be directly associated with selective carrier excitation in one of the two nonequivalent K valleys (K+ or K−, respectively). We have investigated the spin and valley properties for both neutral and charged excitons in transition metal dichalcogenide monolayer MoS2, MoSe2 and WSe2 with cw and time-resolved polarized photoluminescence spectroscopy [1,2]. The key role played by exciton exchange interaction will be presented [3]. We also demonstrate that the optical alignment of excitons (“exciton valley coherence”) can be achieved following one or two photon excitation [1,4]. Finally recent results on magneto-photoluminescence spectroscopy on MoSe2 and WSe2 in Faraday configuration up to 9 T will be presented; the results will be discussed in the framework of a k.p theory [5]. [1] G. Wang et al, PRL 114, 97403 (2015) [2] G. Wang et al, Nature Com. 6, 10110 (2015) [3] J. P. Echeverry, ArXiv 1601.07351 (2016) [4] G. Wang et al, PRL 115, 117401 (2015) [5] G. Wang et al, 2D Mat. 2, 34002 (2015)

Paper Details

Date Published: 4 November 2016
PDF: 1 pages
Proc. SPIE 9931, Spintronics IX, 99313C (4 November 2016); doi: 10.1117/12.2237774
Show Author Affiliations
Cedric Robert, Lab. de Physique et Chimie des Nano-objets (France)
Univ. de Toulouse (France)
Gang Wang, Lab. de Physique et Chimie des Nano-objets (France)
Fabian Cadiz, Lab. de Physique et Chimie des Nano-objets (France)
Andréa Balocchi, Lab. de Physique et Chimie des Nano-objets (France)
Mikhail M. Glazov, Ioffe Institute (Russian Federation)
Thierry Amand, Lab. de Physique et Chimie des Nano-objets (France)
Iann Gerber, Lab. de Physique et Chimie des Nano-objets (France)
Delphine Lagarde, Lab. de Physique et Chimie des Nano-objets (France)
Bernhard Urbaszek, Lab. de Physique et Chimie des Nano-objets (France)
Xavier Marie, Lab. de Physique et Chimie des Nano-objets (France)


Published in SPIE Proceedings Vol. 9931:
Spintronics IX
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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