Liu, RenhuiRenhuiLiuLi, LinhanLinhanLiZhang, YeYeZhangHuang, JianqiJianqiHuangLin, MiaolingMiaolingLinTUAN HUNG NGUYENWang, ZhenhuaZhenhuaWangZhang, ZhidongZhidongZhangSaito, RiichiroRiichiroSaitoTan, PinghengPinghengTan2025-09-242025-09-242024https://www.scopus.com/inward/record.uri?eid=2-s2.0-85213226919&doi=10.1103%2FPhysRevB.110.245422&partnerID=40&md5=60ae88f1f827792c0db0df4cdbad4edahttps://scholars.lib.ntu.edu.tw/handle/123456789/732287Second-order Raman spectra of monolayer MoSe2 are observed by using circularly polarized light for four laser energies, which are resonant with the C exciton. Helicity-dependent Raman spectra show that the overtone mode of a helicity-changing mode observed at 560-610cm-1 is a helicity-conserved mode, while the combinational mode of helicity-changing modes is still a helicity-changing mode. We discuss the selection rule of helicity-dependent double resonance Raman spectra by using first-principles density functional calculations and Raman tensor analysis, in which overtone and combinational modes give exactly opposite helicity-dependent behaviors after the decomposition to the Γ point.Circular PolarizationLight PolarizationSelenium CompoundsCircularly Polarized LightDouble ResonanceFirst-principles Density Functional CalculationsHelicitiesLaser's EnergyRaman TensorResonance Raman SpectraSecond OrdersSelection RulesSpectra'sMonolayersjournal article10.1103/PhysRevB.110.2454222-s2.0-85213226919