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Home > Product > Nanomaterials > Graphene > Defect-free Single Crystals of Graphene > Mechanical exfoliation WS2 on Al2O3

Mechanical exfoliation WS2 on Al2O3 | CAS Number: 7440-33-7

Catalog Number
ACM744033714
Product Name
Mechanical exfoliation WS2 on Al2O3
Structure
CAS Number
7440-33-7
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10 mmx10 mm
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1Long-Lived Valley Polarization of Intravalley Trions in Monolayer WSe_{2}.

Singh A1, Tran K1, Kolarczik M2, Seifert J1, Wang Y1, Hao K1, Pleskot D3, Gabor NM3, Helmrich S2, Owschimikow N2, Woggon U2, Li X1.

Phys Rev Lett. 2016 Dec 16;117(25):257402. doi: 10.1103/PhysRevLett.117.257402. Epub 2016 Dec 16.

We investigate valley dynamics associated with trions in monolayer tungsten diselenide (WSe_{2}) using polarization resolved two-color pump-probe spectroscopy. When tuning the pump and probe energy across the trion resonance, distinct trion valley polarization dynamics are observed as a function of energy and attributed to the intravalley and intervalley trions in monolayer WSe_{2}. We observe no decay of a near-unity valley polarization associated with the intravalley trions during ∼ 25  ps, while the valley polarization of the intervalley trions exhibits a fast decay of ∼4  ps. Read More

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