Giant enhancement of the optical second-harmonic emission of WSe(2) monolayers by laser excitation at exciton resonances

Physical Review Letters
G WangB Urbaszek

Abstract

We show that the light-matter interaction in monolayer WSe_{2} is strongly enhanced when the incoming electromagnetic wave is in resonance with the energy of the exciton states of strongly Coulomb bound electron-hole pairs below the electronic band gap. We perform second harmonic generation (SHG) spectroscopy as a function of laser energy and polarization at T=4  K. At the exciton resonance energies we record an enhancement by up to 3 orders of magnitude of the SHG efficiency, due to the unusual combination of electric dipole and magnetic dipole transitions. The energy and parity of the exciton states showing the strong resonance effects are identified in 1- and 2-photon photoluminescence excitation experiments, corroborated by first principles calculations. Targeting the identified exciton states in resonant 2-photon excitation allows us to maximize k-valley coherence and polarization.

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Citations

Feb 5, 2016·Nano Letters·J KleinJ J Finley
Dec 15, 2015·Nature Communications·Gang WangBernhard Urbaszek
Apr 22, 2015·Nature Nanotechnology·Kyle L SeylerXiaodong Xu
Jan 17, 2017·Nature Nanotechnology·Andre NeumannAlexander Högele
Jan 14, 2017·Nano Letters·Colin M ChowXiaodong Xu
Feb 9, 2017·Journal of the American Chemical Society·Melinda J ShearerSong Jin
Mar 8, 2017·The Journal of Physical Chemistry Letters·Anton AutereZhipei Sun
Jun 7, 2017·Advanced Materials·Ju-Hyuck LeeSang-Woo Kim
Apr 8, 2017·Nature Communications·Shiheng LiangYuan Lu
Dec 15, 2016·Nature Communications·John R SchaibleyXiaodong Xu
Jul 4, 2017·Nano Letters·Hua Wang, Xiaofeng Qian
Feb 9, 2018·Science·Hanyu ZhuXiang Zhang
Apr 17, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Matthew N BrunettiRoman Ya Kezerashvili
May 2, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M S DiwareH Kim
Sep 20, 2017·2d Materials·Kai HaoXiaoqin Li
Apr 22, 2015·Chemical Society Reviews·Hualing Zeng, Xiaodong Cui
Nov 23, 2017·Nanoscale·Bo LiuYongbing Xu
Aug 15, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A HichriS Jaziri
Aug 21, 2015·Nature Materials·Xavier Marie, Bernhard Urbaszek
Jun 15, 2018·Advanced Materials·Jiang Pu, Taishi Takenobu
Feb 10, 2016·Nature Communications·Andreas V StierScott A Crooker
Feb 26, 2016·Nature Communications·Soonyoung ChaHyunyong Choi
Jan 10, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Mahfujur RahamanDietrich R T Zahn
Feb 8, 2018·Nature Communications·Lukas MennelThomas Mueller
Apr 18, 2015·Physical Review Letters·John R SchaibleyXiaodong Xu
Nov 12, 2016·Physical Review Letters·G WangB Urbaszek
Jun 12, 2020·Nanoscale·Yadong WangZhipei Sun
Jul 28, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jonas Emanuel ZimmermannGerson Mette
Mar 27, 2018·Advanced Materials·Anton AutereZhipei Sun

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