Spatially-resolved measurements of spin valley polarization in MOCVD-grown monolayer WSe 2

Batalden, Spencer; Sih, Vanessa

doi:10.1364/OE.426664

Spatially-resolved measurements of spin valley polarization in MOCVD-grown monolayer WSe ₂

Journal Article · Wed May 19 00:00:00 EDT 2021 · Optics Express

DOI:https://doi.org/10.1364/OE.426664· OSTI ID:1842363

Batalden, Spencer; Sih, Vanessa

Time-resolved Kerr rotation microscopy is used to generate and measure spin valley polarization in MOCVD-grown monolayer tungsten diselenide (WSe ₂ ). The Kerr signal reveals bi-exponential decay with time constants of 100 ps and 3 ns. Measurements are performed on several triangular flakes from the same growth cycle and reveal larger spin valley polarization near the edges of the flakes. This spatial dependence is observed across multiple WSe ₂ flakes in the Kerr rotation measurements but not in the spatially resolved reflectivity or microphotoluminescence data. Time-resolved pump-probe overlap measurements further reveal that the Kerr signal’s spatial dependence is not due to spin diffusion on the nanosecond timescale.

View Journal Article

Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0016206

OSTI ID:: 1842363

Alternate ID(s):: OSTI ID: 1852123

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 11 Vol. 29; ISSN 1094-4087; ISSN OPEXFF

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

References (21)

On Optical Dipole Moment and Radiative Recombination Lifetime of Excitons in WSe ₂ Jin, Chenhao; Kim, Jonghwan; Wu, Kedi Advanced Functional Materials, Vol. 27, Issue 19 https://doi.org/10.1002/adfm.201601741	journal	September 2016
Heterostructures based on two-dimensional layered materials and their potential applications Li, Ming-Yang; Chen, Chang-Hsiao; Shi, Yumeng Materials Today, Vol. 19, Issue 6 https://doi.org/10.1016/j.mattod.2015.11.003	journal	July 2016
Defect Activated Photoluminescence in WSe 2 Monolayer Wu, Zhangting; Zhao, Weiwei; Jiang, Jie The Journal of Physical Chemistry C, Vol. 121, Issue 22 https://doi.org/10.1021/acs.jpcc.7b03585	journal	May 2017
Long-Lived Hole Spin/Valley Polarization Probed by Kerr Rotation in Monolayer WSe ₂ Song, Xinlin; Xie, Saien; Kang, Kibum Nano Letters, Vol. 16, Issue 8 https://doi.org/10.1021/acs.nanolett.6b01727	journal	July 2016
Extraordinary Room-Temperature Photoluminescence in Triangular WS ₂ Monolayers Gutiérrez, Humberto R.; Perea-López, Nestor; Elías, Ana Laura Nano Letters, Vol. 13, Issue 8 https://doi.org/10.1021/nl3026357	journal	December 2012
Emerging Photoluminescence in Monolayer MoS₂ Splendiani, Andrea; Sun, Liang; Zhang, Yuanbo Nano Letters, Vol. 10, Issue 4, p. 1271-1275 https://doi.org/10.1021/nl903868w	journal	April 2010
High-mobility three-atom-thick semiconducting films with wafer-scale homogeneity Kang, Kibum; Xie, Saien; Huang, Lujie Nature, Vol. 520, Issue 7549 https://doi.org/10.1038/nature14417	journal	April 2015
Valley-selective circular dichroism of monolayer molybdenum disulphide Cao, Ting; Wang, Gang; Han, Wenpeng Nature Communications, Vol. 3, Issue 1 https://doi.org/10.1038/ncomms1882	journal	January 2012
Visualizing nanoscale excitonic relaxation properties of disordered edges and grain boundaries in monolayer molybdenum disulfide Bao, Wei; Borys, Nicholas J.; Ko, Changhyun Nature Communications, Vol. 6, Issue 1 https://doi.org/10.1038/ncomms8993	journal	August 2015
Control of valley polarization in monolayer MoS2 by optical helicity Mak, Kin Fai; He, Keliang; Shan, Jie Nature Nanotechnology, Vol. 7, Issue 8 https://doi.org/10.1038/nnano.2012.96	journal	June 2012
Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS2 and WS2 Yang, Luyi; Sinitsyn, Nikolai A.; Chen, Weibing Nature Physics, Vol. 11, Issue 10 https://doi.org/10.1038/nphys3419	journal	August 2015
Exciton valley dynamics in monolayer WSe ₂ probed by the two-color ultrafast Kerr rotation Yan, Tengfei; Ye, Jialiang; Qiao, Xiaofen Physical Chemistry Chemical Physics, Vol. 19, Issue 4 https://doi.org/10.1039/C6CP07208A	journal	January 2017
Imaging spin dynamics in monolayer WS ₂ by time-resolved Kerr rotation microscopy McCormick, Elizabeth J.; Newburger, Michael J.; Luo, Yunqiu Kelly 2D Materials, Vol. 5, Issue 1 https://doi.org/10.1088/2053-1583/aa98ae	journal	November 2017
Temporal and spatial valley dynamics in two-dimensional semiconductors probed via Kerr rotation Huang, Jiani; Hoang, Thang B.; Ming, Tian Physical Review B, Vol. 95, Issue 7 https://doi.org/10.1103/PhysRevB.95.075428	journal	February 2017
Intervalley dark trion states with spin lifetimes of 150 ns in WSe 2 Volmer, F.; Pissinger, S.; Ersfeld, M. Physical Review B, Vol. 95, Issue 23 https://doi.org/10.1103/PhysRevB.95.235408	journal	June 2017
Atomically Thin MoS2 A New Direct-Gap Semiconductor Mak, Kin Fai; Lee, Changgu; Hone, James Physical Review Letters, Vol. 105, Issue 13, Article No.136805 https://doi.org/10.1103/PhysRevLett.105.136805	journal	September 2010
Coupled Spin and Valley Physics in Monolayers of MoS 2 and Other Group-VI Dichalcogenides Xiao, Di; Liu, Gui-Bin; Feng, Wanxiang Physical Review Letters, Vol. 108, Issue 19 https://doi.org/10.1103/PhysRevLett.108.196802	journal	May 2012
Gate-Controlled Spin-Valley Locking of Resident Carriers in WSe 2 Monolayers Dey, P.; Yang, Luyi; Robert, C. Physical Review Letters, Vol. 119, Issue 13 https://doi.org/10.1103/PhysRevLett.119.137401	journal	September 2017
Valley relaxation of resident electrons and holes in a monolayer semiconductor: Dependence on carrier density and the role of substrate-induced disorder Li, Jing; Goryca, M.; Yumigeta, K. Physical Review Materials, Vol. 5, Issue 4 https://doi.org/10.1103/PhysRevMaterials.5.044001	journal	April 2021
Observation of ultralong valley lifetime in WSe ₂ /MoS ₂ heterostructures Kim, Jonghwan; Jin, Chenhao; Chen, Bin Science Advances, Vol. 3, Issue 7 https://doi.org/10.1126/sciadv.1700518	journal	July 2017
Valley-polarized exciton dynamics in a 2D semiconductor heterostructure Rivera, P.; Seyler, K. L.; Yu, H. Science, Vol. 351, Issue 6274 https://doi.org/10.1126/science.aac7820	journal	February 2016

Similar Records

Spatial Separation of Carrier Spin by the Valley Hall Effect in Monolayer WSe₂ Transistors

Journal Article · Tue Jan 01 19:00:00 EST 2019 · Nano Letters · OSTI ID:1507158

Gate-Controlled Spin-Valley Locking of Resident Carriers in

{WSe}_{2}

Monolayers

Journal Article · Tue Sep 26 20:00:00 EDT 2017 · Physical Review Letters · OSTI ID:1471348

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
optics

Spatially-resolved measurements of spin valley polarization in MOCVD-grown monolayer WSe 2

Citation Formats

References (21)

Similar Records

Related Subjects

Spatially-resolved measurements of spin valley polarization in MOCVD-grown monolayer WSe ₂