Disorder-dependent valley properties in monolayer WSe2

Handle URI:
http://hdl.handle.net/10754/625294
Title:
Disorder-dependent valley properties in monolayer WSe2
Authors:
Tran, Kha; Singh, Akshay; Seifert, Joe; Wang, Yiping; Hao, Kai; Huang, Jing-Kai; Li, Lain-Jong ( 0000-0002-4059-7783 ) ; Taniguchi, Takashi; Watanabe, Kenji; Li, Xiaoqin
Abstract:
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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
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.
Publisher:
American Physical Society (APS)
Journal:
Physical Review B
Issue Date:
19-Jul-2017
DOI:
10.1103/PhysRevB.96.041302
Type:
Article
ISSN:
2469-9950; 2469-9969
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.
Additional Links:
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.041302
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorTran, Khaen
dc.contributor.authorSingh, Akshayen
dc.contributor.authorSeifert, Joeen
dc.contributor.authorWang, Yipingen
dc.contributor.authorHao, Kaien
dc.contributor.authorHuang, Jing-Kaien
dc.contributor.authorLi, Lain-Jongen
dc.contributor.authorTaniguchi, Takashien
dc.contributor.authorWatanabe, Kenjien
dc.contributor.authorLi, Xiaoqinen
dc.date.accessioned2017-08-07T10:52:00Z-
dc.date.available2017-08-07T10:52:00Z-
dc.date.issued2017-07-19en
dc.identifier.citationTran 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.en
dc.identifier.issn2469-9950en
dc.identifier.issn2469-9969en
dc.identifier.doi10.1103/PhysRevB.96.041302en
dc.identifier.urihttp://hdl.handle.net/10754/625294-
dc.description.abstractWe 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.en
dc.description.sponsorshipWe 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.en
dc.publisherAmerican Physical Society (APS)en
dc.relation.urlhttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.041302en
dc.rightsArchived with thanks to Physical Review Ben
dc.titleDisorder-dependent valley properties in monolayer WSe2en
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalPhysical Review Ben
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Physics and Center for Complex Quantum Systems, University of Texas at Austin, Austin, Texas 78712, USAen
dc.contributor.institutionNational Institute of Material Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japanen
dc.contributor.institutionTexas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USAen
kaust.authorHuang, Jing-Kaien
kaust.authorLi, Lain-Jongen
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