Title
Electrically controlled emission from singlet and triplet exciton species in atomically thin light-emitting diodes
Date Issued
29 April 2021
Access level
open access
Resource Type
journal article
Author(s)
Joe A.Y.
Pistunova K.
Mier Valdivia A.M.
Lu Z.
Wild D.S.
Scuri G.
De Greve K.
Gelly R.J.
Zhou Y.
Sung J.
Sushko A.
Taniguchi T.
Watanabe K.
Smirnov D.
Lukin M.D.
Park H.
Kim P.
University of California
Publisher(s)
American Physical Society
Abstract
We report electrically tunable spin singlet and triplet exciton emission from atomically aligned transition metal dichalcogenide (TMD) heterostructures. The observation of these states in both 0° and 60° heterostructures provides the stacking orientation degree of freedom for polarization switching in interlayer excitons. We confirm the spin configurations of the light-emitting excitons employing magnetic fields to measure effective exciton g factors. The interlayer tunneling current across the TMD heterostructure enables the electrical generation of singlet and triplet exciton emission in this atomically thin p-n junction. We demonstrate tunability between the singlet and triplet exciton photoluminescence via electrostatic gates and excitation power. By tuning the gates and interlayer bias voltage, the electroluminescence of the singlet and triplet can be switched with ratios of 10:1. Atomically thin TMD heterostructure light-emitting diodes thus enable a route for optoelectronic devices that can configure spin and valley quantum states independently.
Volume
103
Issue
16
Language
English
OCDE Knowledge area
Ingeniería eléctrica, Ingeniería electrónica
Física de plasmas y fluídos
Scopus EID
2-s2.0-85105499293
Source
Physical Review B
ISSN of the container
24699950
Sponsor(s)
We thank S. Fang for helpful discussions. We acknowledge support from the DoD Vannevar Bush Faculty Fellowship (Grant No. N00014-18-1-2877 for P.K., Grant No. N00014-16-1-2825 for H.P.), AFOSR MURI (Grant No. FA9550-17-1-0002), NSF and CUA (Grants No. PHY- 1506284 and No. PHY-1125846 for H.P. and M.D.L.), ARL (Grant No. W911NF1520067 for H.P. and M.D.L.), and Samsung Electronics (for P.K. and H.P.). Z.L. and D.S. acknowledge support from the U.S. Department of Energy (Grant No. DE-FG02- 07ER46451) for magnetophotoluminescence measurements performed at the National High Magnetic Field Laboratory, supported by National Science Foundation through Grants No. NSF/DMR-1157490 and No. DMR-1644779 and the State of Florida. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant No. JPMXP0112101001, JSPS KAKENHI Grant No. JP20H00354, and the CREST (Grant No. JPMJCR15F3), JST. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE1745303. Any opinion, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
Sources of information:
Directorio de Producción Científica
Scopus