DOI: 10.1126/science.1258122. Ultrafast generation of pseudo-magnetic field for valley excitons in WSe <sub>2</sub> monolayers

Ultrafast generation of pseudo-magnetic field for valley excitons in WSe 2 monolayers

10.1126/science.1258122

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

The valley pseudospin is a degree of freedom that emerges in atomically thin two-dimensional transition metal dichalcogenides (MX 2 ). The capability to manipulate it, in analogy to the control of spin in spintronics, can open up exciting opportunities. Here, we demonstrate that an ultrafast and ultrahigh valley pseudo-magnetic field can be generated by using circularly polarized femtosecond pulses to selectively control the valley degree of freedom in monolayer MX 2. Using ultrafast pump-probe spectroscopy, we observed a pure and valley-selective optical Stark effect in WSe 2 monolayers from the nonresonant pump, resulting in an energy splitting of more than 10 milli–electron volts between the K and K′ valley exciton transitions. Our study opens up the possibility to coherently manipulate the valley polarization for quantum information applications.

Bibliography

Kim, J., Hong, X., Jin, C., Shi, S.-F., Chang, C.-Y. S., Chiu, M.-H., Li, L.-J., & Wang, F. (2014). Ultrafast generation of pseudo-magnetic field for valley excitons in WSe 2 monolayers. Science, 346(6214), 1205â1208.

Authors 8

Jonghwan Kim (first)
Xiaoping Hong (additional)
Chenhao Jin (additional)
Su-Fei Shi (additional)
Chih-Yuan S. Chang (additional)
Ming-Hui Chiu (additional)
Lain-Jong Li (additional)
Feng Wang (additional)

References 34 Referenced 290

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10.1021/nn405419h
E. J. Sie Y.-H. Lee A. J. Frenzel J. Kong N. Gedik Biexciton formation in monolayer MoS2 observed by transient absorption spectroscopy http://arxiv.org/abs/1312.2918 (2013).
10.1021/nl403742j
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G. Aivazian et al . Magnetic Control of Valley Pseudospin in Monolayer WSe 2 . arXiv:1407.2645 (2014) (10.1038/nphys3201)
A. Srivastava et al . Valley Zeeman effect in elementary optical excitations of a monolayer WSe 2 . arXiv:1407.2624 (2014). (10.1038/nphys3203)
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Dates

Type	When
Created	10 years, 8 months ago (Dec. 4, 2014, 2:18 p.m.)
Deposited	1 year, 7 months ago (Jan. 10, 2024, 4:13 p.m.)
Indexed	1 week, 5 days ago (Aug. 19, 2025, 6:38 a.m.)
Issued	10 years, 8 months ago (Dec. 5, 2014)
Published	10 years, 8 months ago (Dec. 5, 2014)
Published Print	10 years, 8 months ago (Dec. 5, 2014)

Funders 0

None

BibTeX

@article{Kim_2014, title={Ultrafast generation of pseudo-magnetic field for valley excitons in WSe 2 monolayers}, volume={346}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1258122}, DOI={10.1126/science.1258122}, number={6214}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Kim, Jonghwan and Hong, Xiaoping and Jin, Chenhao and Shi, Su-Fei and Chang, Chih-Yuan S. and Chiu, Ming-Hui and Li, Lain-Jong and Wang, Feng}, year={2014}, month=dec, pages={1205–1208} }

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