Magnetoluminescence and valley polarized state of a two-dimensional electron gas in WS2 monolayers View Full Text


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Article Info

DATE

2015-07

AUTHORS

T. Scrace, Y. Tsai, B. Barman, L. Schweidenback, A. Petrou, G. Kioseoglou, I. Ozfidan, M. Korkusinski, P. Hawrylak

ABSTRACT

Materials often exhibit fundamentally new phenomena in reduced dimensions that potentially lead to novel applications. This is true for single-layer, two-dimensional semiconductor crystals of transition-metal dichalcogenides, MX2 (M = Mo, W and X = S, Se). They exhibit direct bandgaps with energies in the visible region at the two non-equivalent valleys in the Brillouin zone. This makes them suitable for optoelectronic applications that range from light-emitting diodes to light harvesting and light sensors, and to valleytronics. Here, we report the results of a magnetoluminescence study of WS2 single-layer crystals in which the strong spin-orbit interaction additionally locks the valley and spin degrees of freedom. The recombination of the negatively charged exciton in the presence of a two-dimensional electron gas (2DEG) is found to be circularly polarized at zero magnetic field despite being excited with unpolarized light, which indicates that the existence of a valley polarized 2DEG is caused by valley and spin locking and strong electron-electron interactions. More... »

PAGES

603-607

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nnano.2015.78

DOI

http://dx.doi.org/10.1038/nnano.2015.78

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1009955229

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/25961511


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