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O4.06 - Spin-Valley Coupling in 2D Transition Metal Dichalcogenides 
April 8, 2015   11:15am - 11:45am

Group VI transition metal dichalcogenides monolayers MX2 (MoS2, MoSe2, WS2,and WSe2) feature a spin splitting with opposite sign in the two degenerate but inequivalent valleys located at corners of 1st Brillouin zone. This spin-valley coupling, particularly pronounced in tungsten dichalcogenides, along with nonzero but contrasting Berry curvatures at K valleys can benefit potential spintronics and valleytronics with the important consequences of spin-valley interplay and the suppression of spin and valley relaxations. In this talk we address the spin-valley coupling in 2D WS2 with optical spectroscopy and photocurrent spectroscopy. This giant spin-valley coupling, together with the valley dependent Berry curvature, may lead to rich possibilities for manipulating spin and valley degrees of freedom in these 2D semiconductors.

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