Magnetic control of valley pseudospin in monolayer WSe2

Aivazian, G.; Gong, Zhirui; Jones, Aaron M.; Chu, Rui-Lin; Yan, J.; Mandrus, D. G.; Zhang, Chuanwei; Cobden, David; Yao, Wang; Xu, X.

doi:10.1038/nphys3201

Title: Magnetic control of valley pseudospin in monolayer WSe₂

Journal Article · Mon Jan 26 00:00:00 EST 2015 · Nature Physics

DOI:https://doi.org/10.1038/nphys3201· OSTI ID:1265429

Aivazian, G. ^[1]; Gong, Zhirui ^[2]; Jones, Aaron M. ^[1]; Chu, Rui-Lin ^[3]; Yan, J. ^[4]; Mandrus, D. G. ^[4]; Zhang, Chuanwei ^[3]; Cobden, David ^[1]; Yao, Wang ^[2]; Xu, X. ^[1]

Univ. of Washington, Seattle, WA (United States)
Univ. of Hong Kong, Hong Kong (China)
Univ. of Texas-Dallas, Richardson, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States)

Local energy extrema of the bands in momentum space, or valleys, can endow electrons in solids with pseudo-spin in addition to real spin^1-5. In transition metal dichalcogenides this valley pseudo-spin, like real spin, is associated with a magnetic moment1,6 which underlies the valley-dependent circular dichroism⁶ that allows optical generation of valley polarization^7-9, intervalley quantum coherence¹⁰, and the valley Hall effect¹¹. However, magnetic manipulation of valley pseudospin via this magnetic moment^12-13, analogous to what is possible with real spin, has not been shown before. Here we report observation of the valley Zeeman splitting and magnetic tuning of polarization and coherence of the excitonic valley pseudospin, by performing polarization-resolved magneto-photoluminescence on monolayer WSe₂. Our measurements reveal both the atomic orbital and lattice contributions to the valley orbital magnetic moment; demonstrate the deviation of the band edges in the valleys from an exact massive Dirac fermion model; and reveal a striking difference between the magnetic responses of neutral and charged valley excitons which is explained by renormalization of the excitonic spectrum due to strong exchange interactions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0008145; SC0002197; HKU705513P; HKU9/CRF/13G; AoE/P-04/08

OSTI ID:: 1265429

Journal Information:: Nature Physics, Vol. 11, Issue 2; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 625 works

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