Type
ArticleAuthors
Tran, KhaSingh, Akshay
Seifert, Joe
Wang, Yiping
Hao, Kai
Huang, Jing-Kai
Li, Lain-Jong

Taniguchi, Takashi
Watanabe, Kenji
Li, Xiaoqin
KAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Date
2017-07-18Preprint Posting Date
2017-03-24Permanent link to this record
http://hdl.handle.net/10754/625294
Metadata
Show full item recordAbstract
We investigate the effect of disorder on exciton valley polarization and valley coherence in monolayer WSe2. By analyzing the polarization properties of photoluminescence, the valley coherence (VC) and valley polarization (VP) are quantified across the inhomogeneously broadened exciton resonance. We find that disorder plays a critical role in the exciton VC, while affecting VP less. For different monolayer samples with disorder characterized by their Stokes shift (SS), VC decreases in samples with higher SS while VP does not follow a simple trend. These two methods consistently demonstrate that VC as defined by the degree of linearly polarized photoluminescence is more sensitive to disorder, motivating further theoretical studies.Citation
Tran K, Singh A, Seifert J, Wang Y, Hao K, et al. (2017) Disorder-dependent valley properties in monolayer WSe2. Physical Review B 96. Available: http://dx.doi.org/10.1103/PhysRevB.96.041302.Sponsors
We gratefully acknowledge helpful discussions with Galan Moody and Fengcheng Wu. The spectroscopic experiments were jointly supported by NSF DMR-1306878 (A.S.) and NSF EFMA-1542747 (K.T., K.H., J.S., and X.L.). H.L. also gratefully acknowledges support from Welch Foundation Grant No. F-1662. K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan and JSPS KAKENHI Grant No. JP15K21722.Publisher
American Physical Society (APS)Journal
Physical Review BarXiv
1703.08478Additional Links
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.041302ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevB.96.041302