Optical manipulation of valley pseudospin

Ye, Ziliang; Sun, Dezheng; Heinz, Tony F.

doi:10.1038/NPHYS3891

Optical manipulation of valley pseudospin

Journal Article · Mon Sep 19 00:00:00 EDT 2016 · Nature Physics

DOI:https://doi.org/10.1038/NPHYS3891· OSTI ID:1361075

Ye, Ziliang ^[1]; Sun, Dezheng ^[1]; Heinz, Tony F. ^[1]

Stanford Univ., CA (United States). Dept. of Applied Physics. Dept. of Photon Science; SLAC National Accelerator Lab., Menlo Park, CA (United States)

The coherent manipulation of spin and pseudospin underlies existing and emerging quantum technologies, including quantum communication and quantum computation. Valley polarization, associated with the occupancy of degenerate, but quantum mechanically distinct valleys in momentum space, closely resembles spin polarization and has been proposed as a pseudospin carrier for the future quantum electronics. Valley exciton polarization has been created in the transition metal dichalcogenide monolayers using excitation by circularly polarized light and has been detected both optically and electrically. In addition, the existence of coherence in the valley pseudospin has been identified experimentally. The manipulation of such valley coherence has, however, remained out of reach. In this paper, we demonstrate all-optical control of the valley coherence by means of the pseudomagnetic field associated with the optical Stark effect. Using below-bandgap circularly polarized light, we rotate the valley exciton pseudospin in monolayer WSe₂ on the femtosecond timescale. Both the direction and speed of the rotation can be manipulated optically by tuning the dynamic phase of excitons in opposite valleys. Finally, this study unveils the possibility of generation, manipulation, and detection of the valley pseudospin by coupling to photons.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); W. M. Keck Foundation (United States)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1361075

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 13; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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